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本文叙述了冲击载荷(机械冲击10~(-2)～10~(-4)秒)下DCB试件快速扩展的实验研究工作,探索出一种新的涡流传感法。此法避免了其他各种方法的缺点,记录下整个扩展过程中裂纹扩展量——时间历程曲线,特别是开裂的起始阶段,这正是目前仍了解得最少的信息。此外,从加速度响应和位移响应波形能正确地确定开裂点和开裂时试件加载点的位移,依此容易地决定K_(IC)~(imp)值。实验表明,对于K_(IC)~(imp)随加载速率增加而增大的材料,冲击作用下尖裂纹的扩展可按等效的位移固定、静载下的钝裂纹情况——等效K_Q值计算。
This paper describes the experimental research on the rapid expansion of DCB specimens under impact load (mechanical impact of 10 -2 to 10 -4 seconds), and explores a new eddy current sensing method. This method avoids the shortcomings of the other methods and records the amount of crack propagation over the entire extension - the time history curve, especially the initial stage of cracking, which is the least understood information so far. In addition, the K_ (IC) ~ (imp) value can be easily determined from the acceleration response and the displacement response waveform to correctly determine the displacement of the specimen at the point of cracking and cracking. The experimental results show that for the material with K_ (IC) ~ (imp) increasing with the loading rate, the extension of the crack tip under impact can be fixed by equivalent displacement and the case of blunt crack under static load - the equivalent K_Q value Calculate.