Continuum damage mechanics is applied to compute fracture J-initiation and J-Resistance(J-R)curve for 20MnMoNi55 material by analyzing TPB and CT specimens.A strong mesh dependency of Gurson model is observed.The expo...Continuum damage mechanics is applied to compute fracture J-initiation and J-Resistance(J-R)curve for 20MnMoNi55 material by analyzing TPB and CT specimens.A strong mesh dependency of Gurson model is observed.The exponential form of q2 parameter shown earlier near crack tip is further modified to have a variable asymptotic value q2a away from crack tip.The asymptotic value q2a is suggested to be a function of crack-tip mesh size to overcome mesh dependency of J-R and load-displacement curves.The relation between q2a with the normalized crack-tip mesh size is determined numerically for CT and TPB specimens.展开更多
文摘Continuum damage mechanics is applied to compute fracture J-initiation and J-Resistance(J-R)curve for 20MnMoNi55 material by analyzing TPB and CT specimens.A strong mesh dependency of Gurson model is observed.The exponential form of q2 parameter shown earlier near crack tip is further modified to have a variable asymptotic value q2a away from crack tip.The asymptotic value q2a is suggested to be a function of crack-tip mesh size to overcome mesh dependency of J-R and load-displacement curves.The relation between q2a with the normalized crack-tip mesh size is determined numerically for CT and TPB specimens.
