KIC 测试中的预制裂纹后拉断的速率转换
Loading Rate—For conventional (quasi-static) tests, the specimen shall be loaded such that the rate of increase of stress-intensity factor is between 0.55 and 2.75 MPa√m/s (30 and 150 ksi√in./min) during the initial elastic displacement.中的0.55-2.75 MPa√m/s怎么转换成 mm/s 的单位。
求大神指教，详细的计算方法跟原理！
有同学和老师研究过断裂韧性测试的吗
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