The freshest surface fracture zone which has been discovered recently in the west mountain of Cixian County is introduced in this paper.

本文介绍了磁县西部山区新近发现的最新地表破裂带。

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The microstructure, surface fracture morphology, hardness and tensile strength of the failed 45 steel connecting bolt were analyzed and tested.

对45钢连接螺栓断裂件的显微组织、断口形貌、硬度和抗拉强度进行了观察分析和测试。

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One is called the S-N curve of surface fracture mode. It is governed by a crystal slip on the specimen surface, which occurs in the region of short fatigue life and high stress amplitude level.

一组叫做表面破坏模式的S-N曲线，它发生在高应力幅短寿命区，是由试样表面晶体滑移引起的。

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For more than six decades, gas companies have been using advanced technologies to hydraulically fracture and safely procure natural gas from up to two miles beneath the surface of the earth.

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