A lifetime prediction procedure for anisotropic materials

In the paper the well-known strain- and stress-based approach to cyclic fat igue assessment of isotropic materials is extended towards anisotropic stru ctures. The methodology is considered in detail for transverse isotropy, as it occurs in directionally solidified materials. Some remarks on cubic ani sotropy for single-crystal applications are given as well. Using a modified HILL approach to describe the anisotropic failure surface, the HILL parame ters, which are a function of the actual loading, are expressed in terms of the parameters of the failure laws for independent material axes. Finally, the procedure is verified by experiments in additional directions showing that the experimental results fit well the results of computational anisotr opic failure assessment. Copyright (C) 2000 John Wiley & Sons, Ltd.