Measurement of Dynamic Fracture in Hot Forming Processing : Effect of Steel Elongation and Temperature

Under the combined influence of a thermal and applied stress, engineering thermoplastics may undergo a phenomenon known as thermomechanical fatigue or as environmental stress cracking. The mechanisms of fatigue propagation are examined with particular emphasis on the similarities and differences between cyclic crack growths in hot forming processing materials. The influence of damage on the intensity of the destruction of materials is studied as well. The fracture of hot forming processing materials subject to high thermal and mechanical loadings rates is notably affected by material inertia. At high loading rates, tiny fluctuations in the plastic flow field induce important acceleration of materials particles. This, significant inertia effects are taking place at the macroscopic level and sometimes also at the level of microscopic deformations mechanisms. Numerical simulations of crack propagation in cylindrical specimen based on Finite Element Analysis (FEA) by ABAQUS Software, demonstrate that the proposed method provides an effective means to simulate dynamic fracture in large scale cylindrical structures with engineering accuracy.