Three Dimensional Fracture Analysis of FGM Coatings
In this study the three – dimensional surface cracking of a graded coating bonded to a homogeneous substrate is considered. The main objective is to model the subcritical crack growth process in the coated medium under a cyclic mechanical or thermal loading. Because of symmetry, along the crack front conditions of mode I fracture and plane strain deformations are assumed to be satisfied. Thus, at a given location on the crack front the crack propagation rate would be a function of the mode I stress intensity factor. A three – dimensional finite element technique for nonhomogeneous elastic solids is used to solve the problem and the displacement correlation technique is used to calculate the stress intensity factor.
Omer Van der Biest, Michael Gasik, Jozef Vleugels
O. Inan et al., "Three Dimensional Fracture Analysis of FGM Coatings", Materials Science Forum, Vols. 492-493, pp. 373-378, 2005