The dynamic SIF variation was found to lag behind the stress-pulse impingement by several microseconds. 人們發現，動態應力強度因子的變化滯後於應力脈衝衝擊幾微秒。
In the process of dynamic unloading, the radial stress unloaded first and then rebounded, the circum stress concentrated. 初始應力動態卸荷時，動應力在隧洞徑向表現為卸荷回彈，而在切向出現動應力集中，表現為載入。
Under the action of the horse head movement, the vibration of the sucker-rod and, furthermore, thedynamic stress will be induced. 在這種懸點位移作用下，將引起抽油桿柱的振動，導致桿柱中的動應力。
