塑料管的耐老化性能及焊接质量与力学破坏有关，是需要重视的问题。
The weathering quality of plastics pipe is a valued question, which is relative with welding quality and mechanical fracture.
大屯矿区姚桥煤矿进入深部开采后，出现各类非线性力学破坏现象，严重影响巷道的正常使用。
With the mining depth increase in Yaoqiao Coal mine in Datun mine area, various nonlinear mechanics damages are appeared, which can seriously affect the safety production.
针对瓦斯突出力学破坏过程，采用最大剪切应力理论首次提出了瓦斯突出地球物理场的能量标志。
The paper firstly put forward the energy indication of geophysical field of gas outburst in accordance with the mechanically destroyed process of gas outburst and the maximum shearing stress theory.
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