论文部分内容阅读
1936年B.贾尔曼曾在锡的单晶体上加一个比它的屈服点低得很多的负载,发现晶体在即速伸长之后,能继续地慢慢伸长。这现象有类似于晶体在范性部分的蠕变;而现在的蠕变现象发生在所谓晶体的弹性部分。贾尔曼称这个现象为晶体的微蠕变。 显然,微蠕变是反映在所谓弹性部分中晶体中质点运动的情形。通常理解为:晶体的负载超过了它的一定臨界切胁强便开始滑移。那么在临界切胁强之前,晶体内部的质点是否像一般所理解仅作弹性的位移?是否当晶体的负载达临界切胁强时,晶体中
In 1936 B. Jahrman applied a much lower load to the tin single crystal than to its yield point and found that the crystal could continue to grow slowly after an instantaneous elongation. This phenomenon is similar to the creep of the crystal in the normal part; the current creep occurs in the so-called elastic part of the crystal. Jarman called this phenomenon a creep of crystals. Obviously, micro-creep is a reflection of particle motion in crystals in the so-called elastic part. It is generally understood that the load of a crystal exceeds its critical cut-off and starts to slip. So before the critical shear stress is strong, is the mass of crystal inside the body as the only general understanding of the only elastic displacement? Whether the crystal load when the critical cut-off is strong, the crystal