Stresses in Bodies with Treated Surfaces

Abstract

The failure of most bodies occurs by the propagation of cracks that can be present in the body from manufacture or may arise during service. To assess the behaviour and generation of cracks we must know what stresses are acting in the component. There are many computational methods and programs which enable stresses in bodies with various shapes to be determined, taking into account the nonhomogeneity of their properties. However, the results always pertain to a particular case. For a successful design of coatings or layers with optimum properties, the general character of stresses in bodies with treated surfaces should be known, and also how these stresses depend on various factors such as the thickness and mechanical properties of the layer compared to the substrate properties. This can best be shown on bodies with a simple shape such as a plate or cylinder.