Abstract
Crack has long been regarded as a form of material failure. At the same time, it is also an effective processing method to create some patterns on the surface of objects. Currently, most crack-based processing methods are achieved by applying equai-biaxial thermal stress. However, the stress ratio of equi-biaxial stress state is fixed, and its flexibility is very limited. In this paper, a method is developed to control the crack propagation in thin film coated on substrate by using generalized biaxial stress. Under some reasonable assumptions on the shear stresses in the interface layer between the film and its substrate, an analytical stress distribution in film under biaxial stress state is obtained. Then, the strain energy density factor is used to predict the propagation direction of a prefabricated crack. By changing the biaxial stress state undergone by film, the crack propagation direction can be controlled. Some verification experiments are conducted, which are consistent with the theoretical prediction.
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