DEVELOPMENT OF MODE-I CRACK PROPAGATION SIMULATION CONSIDERING T-STRESS BASED ON ABAQUS PLATFORM

Cracks will develop in engineering structures during construction or in service. Prediction and research of fracture paths are crucial to prevent and control engineering safety issues by taking into account the stress field constant term T-stress at the crack tip. The traditional Maximum Tangential Stress (MTS) and the Minimum Strain Energy Density (SED) criterion are modified, while the secondary development of ABAQUS's pre-processing, post-processing, and finite element calculation modules is carried out using Python. The updated criterion is incorporated into the automatic crack propagation program's script by the solution's Particle Swarm Optimization algorithm (PSO). The propagation path of the first pure mode-I crack is simulated using the previously mentioned secondary development tool. The results indicate that: The simulation results of the ABAQUS script program are in agreement with the experimental findings of the relevant literature, demonstrating the program's usefulness before realizing the multi-dimensional propagation taking T-stress into account; The modified MTS criterion cannot forecast the deflection phenomena of fractures when the T-stress value is within a specified range, and the propagation path is straight. The updated SED criterion can be applied to make predictions.