Fatigue crack initiation simulation of weld toe based on the Roe-Siegmund cyclic cohesive zone model
In order to establish a simulation method for the fatigue crack initiation behavior of the weld toe,ABAQUS was developed based on the Roe-Siegmund cyclic cohesive zone model to form the VUMAT subroutine for reflecting the fa-tigue cumulative damage.The cohesive parameters of Q345 weld zone materials were obtained by referring to the literature and experimental data.The Voronoi diagram method and co-hesive element method were used to generate a microscopic model with fatigue cumulative damage characteristics and grain characteristics.This model was then merged with the macroscopic butt weld model to simulate multi-scale fatigue crack initiation.The results show that this method can spontan-eously select the crack initiation location and the short crack extension path in accordance with the actual situation,and complete the simulation of the microfracture process of the ma-terial in the welded area,the critical cycle number obtained by different simulation groups exists in a certain distribution range,and the cumulative cohesive length needs to be fitted by experimental data.
weld toecrack initiationcyclic cohesive zone modelcohesive element methodVoronoi diagram method
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