讨论了约束状态和激光冲击的高压、高能、超快及超高应变率对材料响应之间的2个共性问题.激光冲击时,当被冲击材料本身与表面自由约束层能完全约束受冲击区域表面的宏观形变而不影响强化效应时,称为应变屏蔽,此时被冲击件可视为厚件,材料内部将保留大量的应变微结构;反之,当被冲击材料不能约束冲击能量而产生宏观形变时,称为约束击穿,此时被冲击件可视为薄件,冲击效果以塑性变形为主.最后扼要介绍了这2种现象在材料表面强化和微成形制造领域中的应用.
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