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研究了含裂纹板在低速率冲击载荷作用下的互型动态起裂问题。分析了裂尖塑性区附近的周向应变，利用裂尖塑性流变模型的概念，建立了一个裂尖计算模型，推导出裂尖张开位移和裂尖塑性区周线上最大周向应变的关系。据此提出最大周向应变理论作为动态起裂准则。通过ＬＹ１２ＣＺ制成的带裂纹试件在ＭＴＳ─８１０试验机上进行冲击拉伸试验，利用数值计算和实验结合的方法，计算了εθ·（ｔ）、ＣＴＯＤ（ｔ）和Ｊｄ（ｔ）随时间的变化曲线，验证了最大周向应变理论作为动态起裂准则的可行性。
The problem of mutual dynamic initiation of cracked plates under low rate impact load is studied. The circumferential strain around the plastic zone of the crack tip is analyzed. Based on the concept of the plastic rheological model of the crack tip, a crack tip calculation model is established, and the maximum circumferential strain on the perimeter of the plastic zone is derived. relationship. Based on this, the theory of maximum circumferential strain is proposed as a dynamic initiation criterion. The cracked specimens made by LY12CZ were subjected to impact tensile test on MTS ─ 810 testing machine. The relationship between εθ · (t), CTOD (t) and Jd (t) over time was calculated by numerical and experimental methods Curve of variation, verified the feasibility of the theory of maximum circumferential strain as dynamic initiation criterion.