运用柔度法校正了动态冲击的起裂能.借助试验及理论分析,得到J-△a曲线.预制裂纹在起裂之前处于以塑性变形为主导的钝化状态,起裂之后则处于微孔形成与长大机制控制下的延性断裂过程,而起裂点实际上是这两个过程之间的过渡.
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