Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is intricate. Factors like temperature changes during welding can cause plastic deformations, leading to a reduction in elasticity and the generation of residual stresses.
For instance, a plug welded to a plate heats significantly during the process, reducing its stress. As it cools post-welding, its elasticity increases, causing yielding at a constant stress level. This results in residual stress close to the steel's yield strength. Residual stresses also occur during the cooling of metals after casting or hot rolling. The outer layers cool faster than the inner core, regaining stiffness quicker and leading to tensile residual stresses in the core and compressive in the outer layers. These stresses can be significant, sometimes requiring removal through specimen reheating and slow cooling. Understanding and managing residual stresses is crucial in engineering design and manufacturing processes, ensuring the reliability and durability of structures and components.
From Chapter 18:
Now Playing
Stress and Strain - Axial Loading
178 Views
Stress and Strain - Axial Loading
394 Views
Stress and Strain - Axial Loading
508 Views
Stress and Strain - Axial Loading
520 Views
Stress and Strain - Axial Loading
794 Views
Stress and Strain - Axial Loading
250 Views
Stress and Strain - Axial Loading
309 Views
Stress and Strain - Axial Loading
165 Views
Stress and Strain - Axial Loading
158 Views
Stress and Strain - Axial Loading
115 Views
Stress and Strain - Axial Loading
326 Views
Stress and Strain - Axial Loading
314 Views
Stress and Strain - Axial Loading
116 Views
Stress and Strain - Axial Loading
310 Views
Stress and Strain - Axial Loading
695 Views
See More
Copyright © 2025 MyJoVE Corporation. All rights reserved