35CrMoA钢塑性损伤非线性超声响应有限元模拟

基于混合位错超声非线性模型,使用有限元法模拟了非线性超声纵波在35CrMoA钢中的传播过程,并开展了实验验证.结果表明,超声非线性系数与塑性变形具有显著的相关性.金属材料塑性变形引起的超声非线性响应主要来自于位错,文中使用的有限元模型可以较好地模拟不同塑性变形下35CrMoA钢的超声非线性响应.在塑性变形的早期阶段,超...

Finite element simulation of nonlinear ultrasonic response of plastically deformed 35CrMoA steel

Finite element simulations of longitudinal wave propagation in plastically deformed 35CrMoA steel plates were performed based on the mixed dislocation acoustic nonlinearity model, and experiments were conducted to verify the simulation. Simulated and experimental results show a strong relationship between the acoustic nonlinearity parameter and plastic strain. The nonlinear ultrasonic response of metals come primarily from the evolutions of dislocations. In the early stage of plastic deformation, the simulated nonlinearity parameters were overestimated compared with the experimental results due to the dislocation tangle. However, the nonlinearity parameters obtained in simulations was underestimated in the later stage of plastic deformation cause the formation of dislocation cells and dislocation walls, which have a larger nonlinear ultrasonic response than dislocation line.