Name: ultrasonic welding of thermoplastic composite coupons for mechanical characterization of welded joints through single lap shear testing
Uploaded: 2016-02-11T14:00:00.000+00:00
Duration: 8 min 40 s
Description: Watch this Scientific Journal Video about Ultrasonic Welding of Thermoplastic Composite Coupons for Mechanical Characterization of Welded Joints through Single Lap Shear Testing at JoVE.com

The authors would like to acknowledge the support of Ten Cate Advanced Materials in the form of free material supply to the work described in this paper.

1.検体は、超音波溶接用のカッティングと準備<ol><li>サンプル（ 例えば、ダイヤモンドソーまたは水ジェット切断）の縁の剥離を防止する切断技術を使用して、より大きな熱可塑性複合積層体から25.4ミリメートルのx 101.6ミリメートルの長方形のサンプルをカットします。 注：サンプルの寸法は、ASTM D 1002規格に基づいています。 <ol><li>溶接継手の強度が10を溶接される表面の繊維配向に依存するため、同じ方向にすべてのサンプルをカットするように注意してください。 </li></ol></li><li>熱可塑性樹脂が水分を吸収する傾向がある場合には、製造業者の推奨に従ってオーブン中で、乾燥試料を切断した後（ 例えば、6層の炭素繊維135℃で6時間はポリエーテルイミド、CF / PEIサンプル強化しました）。 </li><li>サイズにきちんとした熱可塑性フィルム（複合材料中のマトリックスと同じ樹脂）で作られた平らなエネルギーディレクターをカット（約2少なくとも0.25mmの厚さ×26 6mmでmm）です。必要に応じて、製造業者の推奨に従ってエネルギーディレクターを乾燥（ 例えば、PEIエネルギーディレクターのための135℃で1時間）。 </li><li>溶接の前に、試験片を剥離されたコーナーのために一つ一つを点検し、必要に応じて破棄します。脱脂剤と綿の布を使用して清掃してください。同様の手順でフラットなエネルギーディレクターを清掃してください。 </li></ol>シングルラップせん断クーポンの2超音波溶接注：一定振幅で溶接することができるマイクロプロセッサ制御された超音波溶接機は、この工程で使用します。このような消費される電力やコンピュータ内のデータ収集ソフトウェアへのソノトロード対時間のずれなどの溶接機の出力プロセスデータ、。設計および製造を正確に位置させ、超音波溶着時に単一重ね剪断サンプルをクランプ特注治具（ 図1参照 ）、この工程で使用します。 図1.超音波溶接機と本研究で使用したカスタムビルド溶接セットアップ1：ソノトロード、2：スライド式プラットフォーム、3：（2に接続されている）、上部試料用クランプ、および4：下の試料のためのクランプ（参照より転載エルゼビアからの許可を得て4。） <a href="https://www.jove.com/files/ftp_upload/53592/53592fig1large.jpg" target="_blank">この図の拡大版をご覧になるにはこちらをクリックしてください。</a> <ol><li>各溶接実験の前にログブックのシートに必要事項を記入してください。 <ol><li> RTと湿度、溶接セットアップリファレンス、ソノトロードタイプ、サンプル数や材料、幅、トップとボトムのサンプルの厚さ、およびエネルギーディレクターの厚さ：次のパラメータに注意してください。 </li></ol></li><li>超音波溶接機とコンピュータの電源を入れます。データ収集ソフトを起動し、新しいセッションを開きます。 </li><li>所定の位置にない場合は、sonotを変更その底面が完全溶接領域を覆うように、40mmの直径を有する円筒形のソノトロードに乗りました。 注：ソノトロードの異なる形状を使用することができるが、その底面が溶接面積よりも小さくてはなりません。 </li><li>位置と溶接治具に試験片とエネルギーディレクターを固定（ 図1を参照）。 <ol><li>それは面積が溶接されるよりもわずかに大きい面積（12.7ミリメートルX 25.4ミリメートル）を覆うように粘着テープで底試料にフラットなエネルギーディレクターを取り付けます。 </li><li>ジグに下部サンプルを置き、上部のネジを締めて固定します。 </li><li>それはプロセスの間に所定の位置に留まるように、セットアップのベースにエネルギーディレクターのもう一方の端をテープで固定します。 </li><li>クランプにアッパーサンプルを置き、それを合わせ、上部のネジを締めます。 </li><li>スライディングプラットフォームにトップサンプル用のクランプを置き、両方のネジを締めてください。 </li><li>さらに進む前に、メートル一度すべての4本のネジを締めます鉱石。 </li></ol></li><li> 2.5.8へのステップ2.5.1で説明したように、最も高い溶接強度を達成するために、ソノトロードの変位に基づいて振動位相の最適な期間を決定します。 注：振動位相の最適持続時間は、溶接力と振動振幅のそれぞれの所望の組合せに対して決定されます。 <ol><li>変位制御モードを差動に超音波溶接機を設定します。 </li><li>入力は、超音波溶接機（例えば、300 N及び86.2ミクロン）に力及び振動振幅を溶接します。 注：この超音波溶接機のために、86.2ミクロンは、ピーク・ツー・ピーク振動振幅に相当します。機械の設定では、この値の半分、43.1ミクロンで表されます。 </li><li>入力（例えば0.25 mm）のエネルギーディレクタの初期厚みに等しい値として振動位相の終わりにソノトロード変位、または旅行、。 </li><li>入力凝固力と時間超音波溶接機に（例えば1,000Nと4000ミリ秒）。 </li><li>準備ができたら、防音ヘッドフォンを装着し、超音波溶接プロセスを開始します。 </li><li>溶接距離、最大電力、振動時間とエネルギー：プロセスの完了後、以下の出力パラメータのメモを取ります。溶接セットアップからクーポンを削除し、ペイントマーカーで両端にその識別番号を書き込みます。 </li><li>スプレッドシートに溶接データ（ソノトロードの力と変位）をエクスポートし、プロセスの振動位相の間に対時間曲線力と変位をプロットします。 注：変位曲線は、振動位相の開始時にその位置にソノトロードの相対的な下方への変位をプロットする必要があります。 </li><li> （この場合、0.10ミリメートルで） 図2に示すように、パワー高原（ステージ4）の中央の変位を特定します。 注：この特定の変位値は振動位相と意志の持続時間を制御し、最適な旅行であります同じ溶接力と振幅のための後続のすべての溶接に使用されます。 </li></ol></li></ol><img alt="図2" src="/files/ftp_upload/53592/53592fig2.jpg" /> 図2電源（黒）と変位最適旅行値を示す超音波溶接プロセスのための（灰色）の曲線超音波溶着の振動位相が5段階に分けることができます。最適な旅行の値がステージ4研究のケース内に配置されている：炭素繊維は、ポリエーテルイミド-PEI基板、0.25ミリメートルの厚さのフラットPEIエネルギーディレクター、300 N溶接力、86.2μmの振動振幅、0.25ミリメートルの旅行を強化しました。 （エルゼビアの許可を得て、基準4より転載。） <a href="https://www.jove.com/files/ftp_upload/53592/53592fig2large.jpg" target="_blank">この図の拡大版をご覧になるにはこちらをクリックしてください。</a> <ol start="6"><li>与えられた溶接力と振幅combinatioのための最適な旅行値で溶接クーポンn個。 <ol><li>繰り返しは、各溶接のために2.5.6に2.1を繰り返します。ステップ2.5.3では、対応する溶接力と振幅の組み合わせのためのステップ2.5.8で決定された最適な走行を使用しています。 注：すべてのLSSテスト1.3 mm /分のクロスヘッド速度で万能試験機でのASTM D 1002に従って実施されます。 </li></ol></li></ol> 3.シングルラップせん断強度溶接クーポンの（LSS）のテスト<ol><li>測定し、各溶接クーポンのための重なりの幅をメモを取ります。 </li><li>万能試験機の電源をオンにし、コンピュータ上のLSSのためのテスト手順を開きます。 </li><li>テストインタフェースでは、サンプル番号と重複の寸法を入力します。 0に力を設定し、その初期位置（例えば60 mm）でのグリップのグリップ分離。 </li><li> 図3に示すように、試験機のグリップにサンプルを置きます。 </li></ol><img alt="図3" srC = &quot;/ファイル/ ftp_upload / 53592 / 53592fig3.jpg&quot; /&gt; ズウィック/ロエル250 kNの万能試験機（正確な縮尺ではない）でクランプの図3の模式図で。上部と下部グリップの間のオフセット変位が重ね剪断中に曲げ最小限にするために中央溶接線と負荷方向 ​​を揃えることができます強度試験。 <a href="https://www.jove.com/files/ftp_upload/53592/53592fig3large.jpg" target="_blank">この図の拡大版をご覧になるにはこちらをクリックしてください。</a> <ol start="5"><li> 「スタート」ボタンをクリックすることにより、コンピュータからの試験手順を開始します。 </li><li>サンプルが破断した後、グリップからそれを削除し、テープと一緒に両方の部品を固定します。 </li><li>繰り返しますが、他の全てのサンプルに対して3.3〜3.6を繰り返します。 </li><li>テストが完了すると、各溶接力と振幅の組み合わせのために、標準的に記載された手順に従って、スプレッドシートにデータをエクスポートし、平均LSS値を算出します。 </li></ol>

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The authors declare that they have no competing financial interest.

前のセクションで示された結果は、機械的試験の目的のために、熱可塑性複合シングルラップクーポンの超音波溶着のために、本論文で提案する簡単な方法の妥当性を示しています。次の段落では、結果は方法の3本柱、 すなわち、フラット緩いエネルギー取締役の使用、変位制御の振動や使用の最適な期間を定義するためのプロセスからのフィードバックの使用、ならびにの適用可?...

熱可塑性複合（TPC）は、その費用対効果の高い製造に寄与する溶接される能力を有します。溶接は、軟化または接合面の熱可塑性樹脂を溶融し、密接な接触や溶接界面を横切る熱可塑性ポリマー鎖のその後の相互拡散を可能にするための圧力の下で局所的な加熱を必要とします。分子相互拡散が達成されると、圧力下で冷却して溶接継手を統合します。いくつかの溶接技術は、しかし、メインの「密着」機構、 すなわち、分子の絡み合いは、変更されないまま、熱1のソースで主に異なる熱可塑性複合材料にも適用可能です。超音波溶接は、非常に短い溶接時間（数秒程度）、簡単に自動化を提供し、それが熱可塑性複合基板に補強材の種類の事実上独立しています。また、 その場で 2,3を監視するための可能性を提供</sup&gt;、回線品質保証内または処理窓4の迅速な定義のために使用することができます。熱可塑性複合材の超音波溶接は、主にスポット溶接工程、順次超音波溶接によって長い継ぎ目のが成功した溶接文献5に報告されているです。抵抗または誘導溶接とは対照的に、超音波溶接は、工業的に今まで、熱可塑性複合部品間の構造的接合部に適用されていません。それにもかかわらず、かなりの努力が、現在、航空機用途のための熱可塑性複合材料の構造的な超音波溶接の発展を促進するために捧げられています。 超音波溶接では、接合すべき部品は、横断面粘弾性加熱によって発熱を生じる接合界面に静的力および高周波数低振幅の機械的振動の組み合わせに供されます。溶接界面での優先的な加熱が促進されます表面に樹脂突起を使用することによって基板6よりも、より高い周期的な歪みを受けるため、より高い粘弾性加熱する溶接されます。力と振動がプレスにピエゾ電気変換器、ブースターからなる超音波列車に接続されたソノトロードを介して溶接される部品に発揮されます。ソノトロード接触部分が接合される点と溶接界面との間の距離に応じて、区別が近視野及び遠視野の超音波溶接の間に行うことができます。特定の熱可塑性材料の遠視野溶接の適用は、音波6を伝導する材料の能力に大きく依存する一方で近接場溶接（ソノトロードと接合界面との間6mm未満）は、材料のより広い範囲に適用可能です。 超音波溶接プロセスは、3つの主要な段階に分けることができます。まず、力ビルドアップ段階、そのsonotro中デ徐々に一定のトリガー力に到達するまで、溶接される部品に力を増大させます。無振動はこのフェーズの間に適用されていません。第二に、トリガー力に到達したら、開始振動位相、。この段階では、ソノトロードは、溶接プロセスに必要な熱を発生する一定時間、所定の振幅で振動します。マイクロプロセッサ制御の超音波溶接機は、振動位相、それらの間の時間（ すなわち、直接制御）、変位またはエネルギー（間接的制御）の持続時間を制御するためのいくつかのオプションを提供します。この段階中に印加される力、 すなわち、溶接力は、一定のトリガ力に等しく保つことができるか、徐々に振動の印加時に変化させることができます。第三に、溶接部分が許可されている間に凝固段階は、一定時間特定の凝固力の下で冷却します。無振動は、この最後の段階で適用されません。 溶接FORCE、振動振幅、振動周波数および振動の位相の持続時間（直接または間接的にエネルギー又は変位によって制御）の発熱を制御する溶接パラメータです。周波数がそれぞれ超音波溶接機のために固定されている力、振幅及び持続時間は、ユーザー定義のパラメータです。凝固力と凝固時間は、また、パラメータを溶接、加熱プロセスに介入するが、統合と、一緒にパラメータの残りの部分と、溶接継手の最終品質に影響を与えません。 本稿ではD 1002規格（米国材料試験協会）ASTM次以降の機械的、単一重ね剪断（LSS）、テストのための単一のラップ構成内の個々のTPCクーポンの近接場超音波溶接のための新規の簡単な方法を提示します。溶接クーポンの機械的試験は、プロパティ最もCOMMの一つである関節の見かけの重ね剪断強さを決定することができます唯一の熱可塑性複合材料溶接継手7の強度を定量化するために使用されます。この論文に記載の溶接方法は、3つの柱に基づいています。まず、緩いフラットエネルギーディレクターは、溶接プロセス中に接合界面8,9に優先発熱のために使用されます。第二に、超音波溶接機によって提供されるプロセスデータは急速に特定の力/振幅組み合わせ2,4用の振動位相の最適持続時間を定義するために使用されます。第三に、振動位相の持続時間は、間接的に溶接継手4の一貫した品質を保証するために、ソノトロードの変位によって制御されます。この溶接方法は、熱可塑性複合材料のための最先端の溶接手順にに関して、以下の主なノベルティと利点を提供しています：（a）は、簡略化されたサンプルの代わりに、従来の成形エネルギー取締役3の緩いフラットエネルギーディレクターを使用することによって有効に準備し、 （b）は、高速およびc一般的な試行錯誤のアプローチとは対照的に、in-situでのプロセス監視に基づいて処理パラメータのOST-効率的な定義。この論文に記載された方法は、非常に具体的でシンプルな溶接形状を得ることを目指しているが、それは実際の部品の溶接のための手順を定義するための基礎として役立つことができます。シングルラップクーポンにおける重複の4辺で無制限の流れとは対照的に、その場合の主な違いは、エネルギーディレクターの制約された流れから生じます。

<table><tbody><tr><td>&lt;strong&gt;Material/Reagent&lt;/strong&gt;</td><td></td><td></td><td></td></tr><tr><td>Cetex carbon fiber / polyetherimide (CF/PEI) 5 harness satin prepreg</td><td>TenCate Advanced Composites (www.tencate.com)</td><td>Contact vendor</td><td>Material used in this study for the specimens.</td></tr><tr><td>PFQD solvent degreaser</td><td>PT Technologies Europe (now Socomore - www.socomore.com)</td><td>Contact vendor</td><td>Solvent degreaser for cleaning the specimens and energy directors.</td></tr><tr><td>Cotton cloths</td><td></td><td></td><td>For general cleaning purposes. No specific vendor was used.</td></tr><tr><td>0.25 mm PEI film</td><td>TenCate Advanced Composites (www.tencate.com)</td><td>Contact vendor</td><td>Thin film used as energy director.</td></tr><tr><td>Adhesive tape</td><td>Airtech Advanced Materials Group (www.airtechintl.com)</td><td>1&quot; x 72 yds MFG # 327402 Contact vendor for catalog number</td><td>Used to attach energy director to bottom sample for ultrasonic welding.</td></tr><tr><td>&lt;strong&gt;Name&lt;/strong&gt;</td><td>&lt;strong&gt;Company&lt;/strong&gt;</td><td>&lt;strong&gt;Catalog Number&lt;/strong&gt;</td><td>&lt;strong&gt;Comments&lt;/strong&gt;</td></tr><tr><td>&lt;strong&gt;Equipment&lt;/strong&gt;</td><td></td><td></td><td></td></tr><tr><td>V&amp;ouml;tsch oven</td><td>V&amp;ouml;tsch Industrietechnik (www.voetsch-ovens.com)</td><td>VTU 60/60 - Contact vendor for specific catalog number</td><td>Oven used to dry PEI film (energy directors) and PEI specimens before welding.</td></tr><tr><td>Rinco Dynamic 3000 ultrasonic welder</td><td>Aeson BV (www.aeson.nl/en/)</td><td>Contact vendor</td><td>20 kHz ultrasonic welding machine used for the welding experiments. Several sonotrode sizes available. Contact vendor for details. ACUCapture software included.</td></tr><tr><td>Zwick/Roell universal testing machine</td><td>Zwick (www.zwick.com)</td><td>Z250 - Contact vendor for specific catalog number</td><td>Universal testing machine with maximum load of 250 kN used for single lap shear strength measurements.</td></tr></tbody></table>

ultrasonic welding of thermoplastic composite coupons for mechanical characterization of welded joints through single lap shear testing

This paper presents a novel straightforward method for ultrasonic welding of thermoplastic-composite coupons in optimum processing conditions. The ultrasonic welding process described in this paper is based on three main pillars. Firstly, flat energy directors are used for preferential heat generation at the joining interface during the welding process. A flat energy director is a neat thermoplastic resin film that is placed between the parts to be joined prior to the welding process and heats up preferentially owing to its lower compressive stiffness relative to the composite substrates. Consequently, flat energy directors provide a simple solution that does not require molding of resin protrusions on the surfaces of the composite substrates, as opposed to ultrasonic welding of unreinforced plastics. Secondly, the process data provided by the ultrasonic welder is used to rapidly define the optimum welding parameters for any thermoplastic composite material combination. Thirdly, displacement control is used in the welding process to ensure consistent quality of the welded joints. According to this method, thermoplastic-composite flat coupons are individually welded in a single lap configuration. Mechanical testing of the welded coupons allows determining the apparent lap shear strength of the joints, which is one of the properties most commonly used to quantify the strength of thermoplastic composite welded joints.

炭素繊維強化ポリエーテルイミド（CF / PEI）のサンプルは、この論文に記載の方法以下の溶接しました。サンプルは（0/90）3Sスタッキングシーケンスと1.92ミリメートル公称厚さで、サテン生地のCF / PEI 5-ハーネスから作られた複合積層体から得ました。繊維の主な見かけ配向がその最長辺に平行になるようにサンプルをこのラミネートから切断しました。厚さ...

Watch this Scientific Journal Video about Ultrasonic Welding of Thermoplastic Composite Coupons for Mechanical Characterization of Welded Joints through Single Lap Shear Testing at JoVE.com

Ultrasonic Welding of Thermoplastic Composite Coupons for Mechanical Characterization of Welded Joints through Single Lap Shear Testing

A straightforward procedure for ultrasonic welding of thermoplastic composite coupons for basic mechanical testing is described. Key characteristics of this ultrasonic welding process are the use of flat energy directors for simplified process preparation and the use of process data for the fast definition of optimum processing conditions.

シングルラップせん断試験を経て溶接継手の機械的特性評価のための熱可塑性コンポジットクーポンの超音波溶接

This paper presents a novel straightforward method for ultrasonic welding of thermoplastic-composite coupons in optimum processing conditions. The ...

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11.5K ビュー.  Delft University of Technology. A straightforward procedure for ultrasonic welding of thermoplastic composite coupons for basic mechanical testing is described. Key characteristics of this ultrasonic welding process are the use of flat energy directors for simplified process preparation and the use of process data for the fast definition of optimum processing conditions.

ビデオ: Ultrasonic Welding of Thermoplastic Composite Coupons for Mechanical Characterization of Welded Joints through Single Lap Shear Testing

Manufacturing of Three-dimensionally Microstructured Nanocomposites through Microfluidic Infiltration

Microstructured composite beams reinforced with complex three-dimensionally (3D) patterned nanocomposite microfilaments are fabricated via nanocomposite in&#64257;ltration of 3D interconnected microfluidic networks. The manufacturing of the reinforced beams begins with the fabrication of microfluidic networks, which involves layer-by-layer deposition of fugitive ink filaments using a dispensing robot, filling the empty space between filaments using a low viscosity resin, curing the resin and finally removing the ink.&#160;Self-supported 3D structures with other geometries and many layers (e.g.&#160;a few hundreds layers) could be built using this method. The resulting tubular micro&#64258;uidic networks are then infiltrated with thermosetting nanocomposite suspensions containing nanofillers (e.g.&#160;single-walled carbon nanotubes), and subsequently cured. The infiltration is done by applying a pressure gradient between two ends of the empty network (either by applying a vacuum or vacuum-assisted microinjection). Prior to the infiltration, the nanocomposite suspensions are prepared by dispersing nanofillers into polymer matrices using ultrasonication and three-roll mixing methods. The nanocomposites (i.e.&#160;materials infiltrated) are then solidified under UV exposure/heat cure, resulting in a 3D-reinforced composite structure. The technique presented here enables the design of functional nanocomposite macroscopic products for microengineering applications such as actuators and sensors.

Three-dimensional (3D) microstructured composite beams are fabricated through the directed and localized infiltration of nanocomposites into 3D porous microfluidic networks. The flexibility of this manufacturing method enables the utilization of different thermosetting materials and nanofillers in order to achieve a variety of functional 3D reinforced nanocomposite macroscopic products.

マイクロ流体浸透を通じて立体的微細構造ナノ複合材料の製造

Microstructured composite beams reinforced with complex three-dimensionally (3D) patterned nanocomposite microfilaments are fabricated via nanocomposite ...

化学

A Testing Platform for Durability Studies of Polymers and Fiber-reinforced Polymer Composites under Concurrent Hygrothermo-mechanical Stimuli

The durability of polymers and fiber-reinforced polymer composites under service condition is a critical aspect to be addressed for their robust designs and condition-based maintenance. These materials are adopted in a wide range of engineering applications, from aircraft and ship structures, to bridges, wind turbine blades, biomaterials and biomedical implants. Polymers are viscoelastic materials, and their response may be highly nonlinear and thus make it challenging to predict and monitor their in-service performance. The laboratory-scale testing platform presented herein assists the investigation of the influence of concurrent mechanical loadings and environmental conditions on these materials. The platform was designed to be low-cost and user-friendly. Its chemically resistant materials make the platform adaptable to studies of chemical degradation due to in-service exposure to fluids. An example of experiment was conducted at RT on closed-cell polyurethane foam samples loaded with a weight corresponding to ~50% of their ultimate static and dry load. Results show that the testing apparatus is appropriate for these studies. Results also highlight the larger vulnerability of the polymer under concurrent loading, based on the higher mid-point displacements and lower residual failure loads. Recommendations are made for additional improvements to the testing apparatus.

The durability of polymers and fiber-reinforced polymer composites in service is a critical aspect for their designs and condition-based maintenance. We present a novel low-cost laboratory testing platform for the investigation of the influence of concurrent mechanical and environmental loadings, and may help design more efficient yet safer composite structures.

同時Hygrothermo-機械的刺激下でのポリマーおよび繊維強化ポリマー複合材料の耐久性研究のための試験プラットホーム

The durability of polymers and fiber-reinforced polymer composites under service condition is a critical aspect to be addressed for their robust designs ...

工学

Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer

Friction and wear are detrimental to engineered systems. Ultrasonic lubrication is achieved when the interface between two sliding surfaces is vibrated at a frequency above the acoustic range (20 kHz). As a solid-state technology, ultrasonic lubrication can be used where conventional lubricants are unfeasible or undesirable. Further, ultrasonic lubrication allows for electrical modulation of the effective friction coefficient between two sliding surfaces. This property enables adaptive systems that modify their frictional state and associated dynamic response as the operating conditions change. Surface wear can also be reduced through ultrasonic lubrication. We developed a protocol to investigate the dependence of friction force reduction and wear reduction on the linear sliding velocity between ultrasonically lubricated surfaces. A pin-on-disc tribometer was built which differs from commercial units in that a piezoelectric stack is used to vibrate the pin at 22 kHz normal to the rotating disc surface. Friction and wear metrics including effective friction force, volume loss, and surface roughness are measured without and with ultrasonic vibrations at a constant pressure of 1 to 4 MPa and three different sliding velocities: 20.3, 40.6, and 87 mm/sec. An optical profilometer is utilized to characterize the wear surfaces. The effective friction force is reduced by 62% at 20.3 mm/sec. Consistently with existing theories for ultrasonic lubrication, the percent reduction in friction force diminishes with increasing speed, down to 29% friction force reduction at 87 mm/sec. Wear reduction remains essentially constant (49%) at the three speeds considered.

We present a protocol for using a piezoelectrically-assisted tribometer and optical profilometer to investigate the dependence of ultrasonic wear and friction reduction on linear velocity, contact pressure, and surface properties.

圧電支援摩擦計と光プロフィルを用いた超音波潤滑の実験

Friction and wear are detrimental to engineered systems. Ultrasonic lubrication is achieved when the interface between two sliding surfaces is vibrated at ...

Fabrication of the Thermoplastic Microfluidic Channels

In our lab, we have successfully isolated nucleic acids directly from microliter and submicroliter volumes of human blood, urine and stool using polymer/nanoparticle composite microscale lysis and solid phase extraction columns. The recovered samples are concentrated, small volume samples that are PCRable, without any additional cleanup. Here, we demonstrate how to fabricate thermoplastic microfluidic chips using hot embossing and heat sealing. Then, we demonstrate how to use in situ light directed surface grafting and polymerization through the sealed chip to form the composite solid phase columns. We demonstrate grafting and polymerization of a carbon nanotube/polymer composite column for bacterial cell lysis. We then show the lysis process followed by solid phase extraction of nucleic acids from the sample on chip using a silica/polymer composite column. The attached protocols contain detailed instructions on how to make both lysis and solid phase extraction columns.

Here we demonstrate how to fabricate thermoplastic microfluidic chips using hot embossing and heat sealing. Then we demonstrate how to use in situ light directed surface grafting and polymerization through the sealed chip to form the composite solid phase columns.

熱可塑性マイクロ流体チャネルの作製

In our lab, we have successfully isolated nucleic acids directly from microliter and submicroliter volumes of human blood, urine and stool using ...

生物学

Ultrasonic Fatigue Testing in the Tension-Compression Mode

Ultrasonic fatigue testing is one of a few methods which allow investigating fatigue properties in the ultra-high cycle region. The method is based on exposing the specimen to longitudinal vibrations on its resonance frequency close to 20 kHz. With use of this method, it is possible to significantly decrease the time required for the test, when compared to conventional testing devices usually working at frequencies under 200 Hz. It is also used to simulate loading of material during operation in high speed conditions, such as those experienced by components of jet engines or car turbo pumps. It is necessary to operate only in the high and ultra-high cycle region, due to the possibility of extremely high deformation rates, which can have a significant influence on the test results. Specimen shape and dimensions have to be carefully selected and calculated to fulfill the resonance condition of the ultrasonic system; thus, it is not possible to test the full components or specimens of arbitrary shape. Before each test, it is necessary to harmonize the specimen with the frequency of the ultrasonic system to compensate for deviations of the real shape from the ideal one. It is not possible to run a test until a total fracture of the specimen, since the test is automatically terminated after initiation and propagation of the crack to a certain length, when the stiffness of the system changes enough to shift the system out of the resonance frequency. This manuscript describes the process of evaluation of materials' fatigue properties at high-frequency ultrasonic fatigue loading with use of mechanical resonance at a frequency close to 20 kHz. The protocol includes a detailed description of all steps required for a correct test, including specimen design, stress calculation, harmonizing with the resonance frequency, performing the test, and final static fracture.

A protocol for ultrasonic fatigue testing in the high and ultra-high cycle region in axial tension-compression loading mode.

超音波疲労引張圧縮モードでのテスト

Ultrasonic fatigue testing is one of a few methods which allow investigating fatigue properties in the ultra-high cycle region. The method is based on ...

Magnet Assisted Composite Manufacturing: A Flexible New Technique for Achieving High Consolidation Pressure in Vacuum Bag/Lay-Up Processes

This work demonstrates a protocol to improve the quality of composite laminates fabricated by wet lay-up vacuum bag processes using the recently developed magnet assisted composite manufacturing (MACM) technique. In this technique, permanent magnets are utilized to apply a sufficiently high consolidation pressure during the curing stage. To enhance the intensity of the magnetic field, and thus, to increase the magnetic compaction pressure, the magnets are placed on a magnetic top plate. First, the entire procedure of preparing the composite lay-up on a magnetic bottom steel plate using the conventional wet lay-up vacuum bag process is described. Second, placement of a set of Neodymium-Iron-Boron permanent magnets, arranged in alternating polarity, on the vacuum bag is illustrated. Next, the experimental procedures to measure the magnetic compaction pressure and volume fractions of the composite constituents are presented. Finally, methods used to characterize microstructure and mechanical properties of composite laminates are discussed in detail. The results prove the effectiveness of the MACM method in improving the quality of wet lay-up vacuum bag laminates. This method does not require large capital investment for tooling or equipment and can also be used to consolidate geometrically complex composite parts by placing the magnets on a matching top mold positioned on the vacuum bag.

A new technique for applying consolidation pressure on the vacuum bag lay-up to fabricate composite laminates is described. The goal of this protocol is to develop a simple, cost-effective technique to improve the quality of laminates fabricated by the wet lay-up vacuum bag method.

磁石は、複合材生産を支援: 柔軟な新しい技術高圧真空袋/Lay アップ プロセスを達成するため

This work demonstrates a protocol to improve the quality of composite laminates fabricated by wet lay-up vacuum bag processes using the recently developed ...

Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel

Friction stir spot welding (FSSW), a derivative of friction stir welding (FSW), is a solid-state welding technique that was developed in 1991. An industry application was found in the automotive industry in 2003 for the aluminum alloy that was used in the rear doors of automobiles. Friction stir spot welding is mostly used in Al alloys to create lap joints. The benefits of friction stir spot welding include a nearly 80% melting temperature that lowers the thermal deformation welds without splashing compared to resistance spot welding. Friction stir spot welding includes 3 steps: plunging, stirring, and retraction. In the present study, other materials including high strength steel are also used in the friction stir welding method to create joints. DP780, whose traditional welding process involves the use of resistance spot welding, is one of several high strength steel materials used in the automotive industry. In this paper, DP780 was used for friction stir spot welding, and its microstructure and microhardness were measured. The microstructure data showed that there was a fusion zone with fine grain and a heat effect zone with island martensite. The microhardness results indicated that the center zone exhibited a greater degree of hardness compared with the base metal. All data indicated that the friction stir spot welding used in dual phase steel 780 can create a good lap joint. In the future, friction stir spot welding can be used in high-strength steel welding applied in industrial manufacturing processes.

Here, we present a friction stir spot welding (FSSW) protocol on dual phase 780 steel. A tool pin with high-speed rotation generates heat from friction to soften the material, and then, the pin plunges into 2 sheet joints to create the lap joint.

DP780スチールの摩擦攪拌スポット溶接によるラップジョイントの生成

Friction stir spot welding (FSSW), a derivative of friction stir welding (FSW), is a solid-state welding technique that was developed in 1991. An industry ...

Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates

Many body armor designs incorporate unidirectional (UD) laminates. UD laminates are constructed of thin (&#60;0.05 mm) layers of high-performance yarns, where the yarns in each layer are oriented parallel to each other and held in place using binder resins and thin polymer films. The armor is constructed by stacking the unidirectional layers in different orientations. To date, only very preliminary work has been performed to characterize the ageing of the binder resins used in unidirectional laminates and the effects on their performance. For example, during the development of the conditioning protocol used in the National Institute of Justice Standard-0101.06, UD laminates showed visual signs of delamination and reductions in V50, which is the velocity at which half of the projectiles are expected to perforate the armor, after ageing. A better understanding of the material property changes in UD laminates is necessary to comprehend the long-term performance of armors constructed from these materials. There are no current standards recommended for mechanically interrogating unidirectional (UD) laminate materials. This study explores methods and best practices for accurately testing the mechanical properties of these materials and proposes a new test methodology for these materials. Best practices for ageing these materials are also described.

The goal of the study was to develop protocols to prepare consistent specimens for accurate mechanical testing of high-strength aramid or ultra-high-molar-mass polyethylene-based flexible unidirectional composite laminate materials and to describe protocols for performing artificial ageing on these materials.

柔軟な単方向複合ラミネートの切断手順、引張試験、およびエージング

Many body armor designs incorporate unidirectional (UD) laminates. UD laminates are constructed of thin (&#60;0.05 mm) layers of high-performance yarns, ...

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

A procedure using digital image correlation (DIC) to detect cracks on welded specimens during fatigue tests on resonance testing machines is presented. It is intended as a practical and reproducible procedure to identify macroscopic cracks at an early stage and monitor crack propagation during fatigue tests. It consists of strain field measurements at the weld using DIC. Images are taken at fixed load cycle intervals. Cracks become visible in the computed strain field as elevated strains. This way, the whole width of a small-scale specimen can be monitored to detect where and when a crack initiates. Subsequently, it is possible to monitor the development of the crack length. Because the resulting images are saved, the results are verifiable and comparable. The procedure is limited to cracks initiating at the surface and is intended for fatigue tests under laboratory conditions. By visualizing the crack, the presented procedure allows direct observation of macrocracks from their formation until rupture of the specimen.

Digital image correlation is used in fatigue tests on a resonance testing machine to detect macroscopic cracks and monitor crack propagation in welded specimens. Cracks on the specimen surface become visible as increased strains.

デジタル画像相関を用いた溶接試料の共振疲労試験における亀裂モニタリング

A procedure using digital image correlation (DIC) to detect cracks on welded specimens during fatigue tests on resonance testing machines is presented. It ...

繊維複合積層板の作製と機械的特性評価

Measuring the Mechanical Properties of Glass Fiber Reinforcement Polymer Composite Laminates Obtained by Different Fabrication Processes

The traditional wet hand lay-up process (WL) has been widely applied in the manufacturing of fiber composite laminates. However, due insufficiency in the forming pressure, the mass fraction of fiber is reduced and lots of air bubbles are trapped inside, resulting in low-quality laminates (low stiffness and strength). The wet hand lay-up/vacuum bag (WLVB) process for the fabrication of composite laminates is based on the traditional wet hand lay-up process, using a vacuum bag to remove air bubbles and provide pressure, and then carrying out the heating and curing process. 
Compared with the traditional hand lay-up process, laminates manufactured by the WLVB process show superior mechanical properties, including better strength and stiffness, higher fiber volume fraction, and lower void volume fraction, which are all benefits for composite laminates. This process is completely manual, and it is greatly influenced by the skills of the preparation personnel. Therefore, the products are prone to defects such as voids and uneven thickness, leading to unstable qualities and mechanical properties of the laminate. Hence, it is necessary to finely describe the WLVB process, finely control steps, and quantify material ratios, in order to ensure the mechanical properties of laminates. 
This paper describes the meticulous process of the WLVB process for preparing woven plain patterned glass fiber reinforcement composite laminates (GFRPs). The fiber volume content of laminates was calculated using the formula method, and the calculated results showed that the fiber volume content of WL laminates was 42.04%, while that of WLVB laminates was 57.82%, increasing by 15.78%. The mechanical properties of the laminates were characterized using tensile and impact tests. The experimental results revealed that with the WLVB process, the strength and modulus of the laminates were enhanced by 17.4% and 16.35%, respectively, and the specific absorbed energy was increased by 19.48%.

著者スポットライト:ウェットハンドレイアップ/真空バッグプロセスによる繊維複合ラミネートの品質向上 

This paper describes a fabrication process for fiber-reinforced polymer matrix composite laminates obtained using the wet hand lay-up/vacuum bag method.

異なる製造プロセスで得られたガラス繊維強化ポリマー複合積層物の機械的特性の測定

The traditional wet hand lay-up process (WL) has been widely applied in the manufacturing of fiber composite laminates. However, due insufficiency in the ...

シングルラップせん断試験を経て溶接継手の機械的特性評価のための熱可塑性コンポジットクーポンの超音波溶接

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マイクロ流体浸透を通じて立体的微細構造ナノ複合材料の製造

同時Hygrothermo-機械的刺激下でのポリマーおよび繊維強化ポリマー複合材料の耐久性研究のための試験プラットホーム

圧電支援摩擦計と光プロフィルを用いた超音波潤滑の実験

熱可塑性マイクロ流体チャネルの作製

超音波疲労引張圧縮モードでのテスト

磁石は、複合材生産を支援: 柔軟な新しい技術高圧真空袋/Lay アッププロセスを達成するため

DP780スチールの摩擦攪拌スポット溶接によるラップジョイントの生成

柔軟な単方向複合ラミネートの切断手順、引張試験、およびエージング

デジタル画像相関を用いた溶接試料の共振疲労試験における亀裂モニタリング

異なる製造プロセスで得られたガラス繊維強化ポリマー複合積層物の機械的特性の測定

シングルラップせん断試験を経て溶接継手の機械的特性評価のための熱可塑性コンポジットクーポンの超音波溶接

要約

さらに動画を探す

この動画の章

マイクロ流体浸透を通じて立体的微細構造ナノ複合材料の製造

同時Hygrothermo-機械的刺激下でのポリマーおよび繊維強化ポリマー複合材料の耐久性研究のための試験プラットホーム

圧電支援摩擦計と光プロフィルを用いた超音波潤滑の実験

熱可塑性マイクロ流体チャネルの作製

超音波疲労引張圧縮モードでのテスト

磁石は、複合材生産を支援: 柔軟な新しい技術高圧真空袋/Lay アップ プロセスを達成するため

DP780スチールの摩擦攪拌スポット溶接によるラップジョイントの生成

柔軟な単方向複合ラミネートの切断手順、引張試験、およびエージング

デジタル画像相関を用いた溶接試料の共振疲労試験における亀裂モニタリング

異なる製造プロセスで得られたガラス繊維強化ポリマー複合積層物の機械的特性の測定

磁石は、複合材生産を支援: 柔軟な新しい技術高圧真空袋/Lay アッププロセスを達成するため