Dynamic Fracture and Mechanical Property of D6A, 921 and 45 Steels under Low Shock Pressure
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摘要: 通过对称碰撞研究了D6A、921和45钢的动态损伤与破坏行为。利用自由面速度的双波结构,结合材料在常压下的弹性纵波声速,确定了三种钢的低压Hugoniot关系,同时给出了三种钢的弹性Hugoniot屈服极限以及层裂强度。但是发现,屈服极限和层裂强度的材料分散性明显,在其影响下,层裂强度对加载幅度以及应变率的依赖性得不到体现,从而在其不确定度范围内,可将层裂强度看成一个常数。提出了一个唯象的损伤演化方程,在此基础上,对实验结果进行了部分数值模拟,数值模拟给出的层裂强度远大于近似解析模型的计算结果,两者之间的差异有待进一步研究。Abstract: The behaviors of dynamic damage and fracture of D6A, 921, 45 steels were studied via symmetric impact experiments. Using the double wave structure of the free-surface velocity profile and the material longitudinal elastic wave speed at room temperature, we obtained the D-up Hugoniot relations for the three steels. The Hugoniot elastic limits and spall strengths of the three steels were also obtained. A new simple phenomenal equation for describing the evolution of damage was proposed, with which the experimental spall processes were simulated.
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Key words:
- D6A steel /
- 921 steel /
- 45 steel /
- spallation /
- shock /
- dynamic damage
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