摘要
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。
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.
出处
《工程力学》
EI
CSCD
北大核心
2007年第9期154-158,165,共6页
Engineering Mechanics
基金
国家自然科学基金项目(50675190)
关键词
脉冲放电
拉伸试件
空间裂纹
止裂
机械性能
pulse current discharge
tension specimen
spatial crack
crack arrest
mechanical property
