导电体内部裂纹止裂新法的实验研究

介绍了导电体内部裂纹止裂的一种新实验方法。实验结果表明：利用电磁热效应对导体内部裂纹进行止裂不但是可行的，而且具有保持外力作用不变、方法简便、收效迅速、提高韧性等优点。其原理是在向导体通入脉冲电流的瞬间，裂纹尖端处的温度急剧升高，使材料熔化形成焊口同时在周围产生足够大的热压应力，破坏了干线裂纹源的形成，遏制了裂纹的扩展。

The Experimental Study of New Method for Crack Preventing on Conductor with Internal Crack

In this paper, a new experimental method of crackpreventing for conductor with internal crack has been introduc-ed. The experdriental results show that the crack preventing fora current conductor with cracks by the heat effect of electro-magnetic not only is feasible, but also has many advantages,such as keeping outside force, simplicity, efficiency, and im-proving toughness and so on. The theory is that the temperatureof tip of crack increases rapidly when the pulse current passesthe conductor. The small welded joint can be formed by hightemperature near the tip of the crack. Meanwhile, the higherheat pressure stress is formed around tip of crack. As these re-sults, the formation of main crack resource will be prevented,and the propagting of the crack will be prevented, too.