带有空间裂纹的拉伸试件电磁热止裂及机械性能测试

首先应用ZL-2超强脉冲电流发生装置对带有预制裂纹的标准拉伸试件进行脉冲放电止裂。放电后裂纹尖端熔化形成堆焊和高压应力区,使裂纹尖端钝化,达到了止裂的目的,采用数值模拟确定了止裂工艺参数。对止裂后的拉伸试件通过微机控制电子万能试验机进行了拉伸实验,研究结果表明:电磁热裂纹止裂有效提高了试件的抗拉强度,放电电压是影响其机械性能的最主要因素。

PREVENTING CRACK USING ELECTROMAGNETIC HEATING AND MECHANICAL PROPERTY TESTING FOR SPECIMENS WITH SPACE CRACK UNDER TENSION

Firstly, crack prevention was achieved in a cracked standard tension specimen by pulse current discharge using ZL-2 pulse current generating equipment. The melt of crack tip formed a compressed stress area around the crack tip, which inhibited further cracking. The curvature radius around the crack tip can be increased by several orders of magnitude instantly using this method. Numerical simulation was used to obtain the technical parameters for crack prevention. After crack inhibition, the cracked specimen was subject to tension. The results show that the tensile strength of the specimen increase considerably after crack prevention using electromagnetic heating, and the discharged voltage is the most important factor.