Residual stresses are stress fields that prevail in non-loaded structures. |
Residual stresses are stress fields that prevail in unloaded structures.
|
For instance, a normal bolt resting in the palm of your hand may experience large measures of stress. |
For example, a normal screw resting in the palm of your hand can experience large measures of stress.
|
This is not because of your demeanor or the way you are holding it, instead it is due to the way the bolt has been manufactured. |
This is not due to its behavior or the way you hold it, but to the way the screw was manufactured. |
A quality thread is rolled rather than cut. |
A quality line is wound rather than cut. |
Thus the material has been subjected to significant plastic deformation, which creates compressive stresses in the creases of the thread. |
Assim, o material foi submetido a deformações plásticas significativas, o que cria tensões de compressão nos vincos da rosca. |
The treatment also generates tensile stresses, as required by the law of force equilibrium. |
The treatment also generates tensile stresses, as required by the law of force equilibrium.
|
Compressive residual stresses in the thread are favorable to the fatigue life of the bolt, and are thus desirable. |
Compressive residual stresses in the thread are favorable for bolt fatigue and therefore desirable. |
The corresponding tensile stress's, on the other hand, may have a negative impact on the maximum load carrying capacity. |
The corresponding tensile stresses, on the other hand, can have a negative impact on the maximum load capacity. |
However, this weakening effect is small thanks to the material's ability to yield and redistribute the stress fields in the event of an extreme load. |
However, this weakening effect is small thanks to the material's ability to yield and redistribute stress fields in the case of extreme loading. |
Residual stresses may have positive, negative or no practical effects on a structure's mechanical integrity. |
Residual stresses can have positive, negative, or no practical effect on the mechanical integrity of a structure. |
Whatever the case may be, knowing about them is important. |
Whatever the case, it is important to know them. |
This chapter explains common causes and possible effects of residual stresses, and thoroughly prepares the reader for related topics in subsequent chapters. |
This chapter explains the common causes and possible effects of residual stresses and thoroughly prepares the reader for the related topics in subsequent chapters. |