| 于淑敏,朱 晨,黄志强.35CrMoA钢塑性损伤非线性超声响应有限元模拟[J].,2021,40(4):588-593 |
| 35CrMoA钢塑性损伤非线性超声响应有限元模拟 |
| Finite element simulation of nonlinear ultrasonic response of plastically deformed 35CrMoA steel |
| 投稿时间：2020-09-09 修订日期：2021-07-03 |
| 中文摘要: |
| 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应变具有显著的相关性。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的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，超声非线性系数模拟结果低于实验结果，其原因可能是在塑性变形初期，在位错密度较高的区域出现位错缠结，阻碍了位错运动，从而降低了位错超声非线性响应。在塑性变形后期，位错密度增加，位错之间相互堆积，形成位错胞和位错墙，而位错胞和位错墙引发的超声非线性响应高于平面位错。因此，在塑性变形后期超声非线性系数计算结果低于实验结果。 |
| 英文摘要: |
| 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. |
| DOI：10.11684/j.issn.1000-310X.2021.04.013 |
| 中文关键词: 35CrMoA钢，超声非线性，二次谐波，塑性损伤，有限元模拟 |
| 英文关键词: 35CrMoA steel, ultrasonic nonlinearity, second-harmonic generation, plastic damage, finite element simulation |
| 基金项目: |
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