EFFECT OF SEVERAL VARIABLES ON J-COD RELATIONSHIP AND PLASTIC ROTATIONAL FACTOR R-RHO

A series of tests was performed on a Chinese alloy steel. The influenc e of several variables on the relation of J-COD and the plastic rotati onal factor r(p) is experimentally studied. These variables are yield strength sigma(gamma) and work-harding exponent n of each material, an d the crack depth/specimen width ratio a/w. Results show that the rela tionship of J-COD and the plastic rotational factor r(p) should be a f unction of the yield strength sigma(gamma), strain-hardening exponent n and a/w ratio.