Finite element evaluation of mixed mode stress intensity factors in functionally graded materials
نویسندگان
چکیده
This paper is directed towards :nite element computation of fracture parameters in functionally graded material (FGM) assemblages of arbitrary geometry with stationary cracks. Graded :nite elements are developed where the elastic moduli are smooth functions of spatial co-ordinates which are integrated into the element sti=ness matrix. In particular, stress intensity factors for mode I and mixed-mode two-dimensional problems are evaluated and compared through three di=erent approaches tailored for FGMs: path-independent J ∗ k -integral, modi:ed crack-closure integral method, and displacement correlation technique. The accuracy of these methods is discussed based on comparison with available theoretical, experimental or numerical solutions. Copyright ? 2001 John Wiley & Sons, Ltd.
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