The dynamic SIF variation was found to lag behind the stress-pulse impingement by several microseconds. 人們發(fā)現，動(dòng)態(tài)應力強度因子的變化滯后于應力脈沖沖擊幾微秒。
In the process of dynamic unloading, the radial stress unloaded first and then rebounded, the circum stress concentrated. 初始應力動(dòng)態(tài)卸荷時(shí)，動(dòng)應力在隧洞徑向表現為卸荷回彈，而在切向出現動(dòng)應力集中，表現為加載。
Under the action of the horse head movement, the vibration of the sucker-rod and, furthermore, thedynamic stress will be induced. 在這種懸點(diǎn)位移作用下，將引起抽油桿柱的振動(dòng)，導致桿柱中的動(dòng)應力。
