FEM Analysis of Elastic Plastic Fracture Behaviour of High Ductile Center Cracked Specimen

چکیده مقاله

Fracture mechanics is an important tool in improving the mechanical performance of mechanical components. In this study methodology for J-integral and crack length are investigated in a center cracked panel in pure tension specimen made of high ductile stainless steel. Experimental research was conducted on specimens made of stainless steel X 5 CrNi 18 10. First series of tests were conducted on specimens prepared for classic tension test to determine real characteristics of material, and after on standard CCT specimens. Loading-Unloading technique is used to determine compliance of material and crack resistance curve. For calculating the modified path independent J-integral in the specimens, a post processor for finite element results was developed by Ansys code and node releasing technique. Comparison of applied J_I versus the J-R curve allows the determination of the crack size or stress at which unstable tearing occurs. Since material used high ductility, compliance first decreases then reaches a minimum and finally increases.