Crack initiation angles in functionally graded materials under mixed mode loading


Oral A. , Abanto-Bueno J. L. , Lambros J., Anlas G.

9th International Conference on Multiscale and Functionally Graded Materials, Hawaii, United States Of America, 15 - 18 October 2006, vol.973, pp.248-249 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 973
  • City: Hawaii
  • Country: United States Of America
  • Page Numbers: pp.248-249

Abstract

In this study, quasi-static crack initiation under mixed mode loading in planar (2-D) functionally graded materials is presented. First, crack initiation in the homogeneous material which forms the basis of our FGM - polyethylene - is studied. The Generalized Maximum Tangential Stress Criterion (GMTS) is applied through use of finite elements to determine crack initiation angles in a cracked 2-D functionally graded material. The effects of crack length, T-stress, inherent length scale r(c) and mode mixity are discussed. Computational results of crack initiation angles are compared to experimental results obtained using functionally graded polyethylene. Stress Intensity factors for a center cracked FGM are calculated.