ON THE APPLICATION OF THE BEREMIN MODEL FOR PREDICTING THE BRITTLE FRACTURE RESISTANCE

摘要

The Beremin model of brittle fracture was implemented for a cast ferritic steel materials using the MARC finite element code. The effect of different material parameters (like yield stress, strain hardening exponent) was investigated on the Beremin model's parameters. Also it was analysed how the applied numerical procedure affects these results. As it was found, the strain hardening exponent has small effect on the model parameters, the yield stress has stronger effect. The applied fitting method can cause larger differences. The numerical values of the Weibull-parameters depends strongly on the scatter of the measured fracture probability values. Then the fracture behaviour of Charpy-V specimens was predicted by applying the obtained Beremin-model's parameters. The accuracy of the prediction mostly depends on the variation of the yield stress.