Investigation on critical triaxiality along unified yield loci at crack tip under mixed mode (I + II) fracture

• Ruchin Kacker ^[1] ; Shailendra Singh Bhadauria ^[1] ; Talwar Raghupathi ^[1]
  1. [1] Institute of Technology Jalandhar
• Localización: Mechanics based design of structures and machines, ISSN 1539-7734, Vol. 46, Nº. 4, 2018, págs. 440-454
• Idioma: inglés
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• Resumen

  • Metallic components used in industries and day to day appliances often contain micro-cracks. In general, cracks occur in various orientations to the loading axis. The present paper discusses the criticality of stress triaxiality, a well-known ductile fracture parameter, on the yield loci at the crack tip. In the process, an old model of stress triaxiality has been generalized using unied strength theory to incorporate various convex and nonconvex failure criteria, including single shear, twin shear, etc. The new triaxiality model also reveals about the eect of intermediate principal stress at the crack tip for materials with and without strength dierence.

    The crack initiation angles at the crack tip, obtained through the proposed model have been found to be in unison with those obtained through other fracture criteri