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对超强脉冲放电止裂瞬间产生的动力学效应及其对裂纹尖端的影响进行研究,通过位移势函数的求解给出准稳态各应力应变分量;通过拉氏变换得出具有动力学效应下的各应力应变分量。以单边裂纹的无限大薄板为例,具体计算出瞬时点热源下的准稳态和动力学效应两种情况下的裂纹尖端局部区域的应力及变化。研究结果表明,在点热源产生的很短时间内,动力学效应会在裂尖附近由于“热击”产生压应力的突变,带有惯性项的动力学效应能更有效的遏制裂纹的扩展。
The kinetic effect and its influence on the crack tip at the moment of crack arrest of super impulse discharge are studied. The stress and strain components of quasi-steady state are obtained by the solution of displacement potential function. The dynamic response is obtained by Laplace transform Of the stress and strain components. Taking an infinitely thin plate with unilateral cracks as an example, the stress and the change of the crack tip in the local area under the two conditions of quasi - steady state and dynamic effect under the instantaneous point heat source are calculated. The results show that in a short period of time, the kinetic effect will cause the sudden change of compressive stress near the crack tip due to the “hot strike”, and the kinetic effect with inertia term can effectively suppress the crack Expand.