displacement n. 1.转位,移动;取代,置换;(人的)流离失所。 2.撤换,免职。 3.【机械工程】(活塞)排气量;【航海】排水量〔一般指军舰的排水量;商船的排水量一般用 gross [net] ton(nage)〕。 4.【化学】置换(作用),取代(作用);【物理学】位移;【医学】移位;【生物学】替位;【药学】滤过;【地质学;地理学】(断层)移动。 displacement nitration process 【化学】取代硝化。
constant adj. 1.恒定不变的,固定的,稳定的,恒久的;继续不断的。 2.不屈不挠的,坚韧的。 3.忠实的,有节操的。 be constant in love 忠贞不渝的爱情。 two days of constant rain 两天接连下雨。 constant to one's duty 忠于职守。 constant wind 恒风。 n. 【数、物】常数,恒量;恒定(值);(常)系数,率;【语法】(转换语法用语)定项。 the circular constant圆周率。 adv. -ly
It was found that many dislocations were emitted from the crack tip during the early stage of crack propagation and were driven out of the crack tip area , and them piled up inversely . a closed dislocation free zone ( dfz ) was formed between the crack tip and the pile - up dislocations . keeping displacement constant , the dislocations were still emitted from the crack tip for a while 本文首先系统地研究了工业纯金属( fe , al , ti和mg )断裂的微观过程,发现所研究的工业纯金属断裂过程裂尖均首先发射位错,并离开裂尖向前运动、在裂尖留下无位错区,位错反塞积在五位错区的端部,反塞积位错群一般呈封闭状包围无位错区。
Keeping displacement constant , the length of dfz decreased . the less the lattice resistance is , the longer the dfz is . during the crack propagation , the pile - up dislocations may move forward in the previous direction or in another direction which caused shape of dfz changed . the dislocations emitted from the crack tip might pile up in the dfz and can be served as dislocation source in the successive loading 在裂纹扩展过程,反塞积位错群发生变化,可以沿原来方向继续向前运动,也可能改变运动方向使无位错区的形状发生变化,后来发射出的位错可以在原五位错区中塞积,并可作为位错源在后续的加载中发射位错。