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爱与雨下: 金币+1 2014-10-06 09:05:40
八角寨: 金币+4, 翻译EPI+1, ★★★★★最佳答案, 非常感谢。 2014-10-06 11:50:54
As shown in Fig. 6 (the crests and troughs), the speed-time curve shows a oscillation phenomenon, which is because that the crack propagates faster along a straight line than along a turning point during crack propagation.

When the crack propagates from a turning point back to a straight line, the speed has a sudden acceleration process and then restores to an approximate uniform motion.
2楼2014-10-06 04:55:25
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