The stress-strain concentration is detected at the corner of Cu pad, the lower stress for the outer of Cu pad.

通孔拐角附近是应力应变的集中区，沿界面至焊盘外缘，应力应变逐渐降低。

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The variation of the strain concentration factors and the yield boundaries with loading levels were determined.

获得了应变集中系数和弹塑性边界区随载荷变化的规律；

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The experimental result also shows that composite edge has the effect of increasing strain concentration factor.

试验结果还说明复合材料边缘有提高应变集中系数的效应。

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But just as striking for me has been the experience of sitting no more than a metre and a half away from Oscar Pistorius - able to hear his breathing patterns, his sobs, muttered prayers, and to see the muscles strain on his neck as he stares forward, with the concentration you would expect from someone braced for the start of an Olympic final.

BBC: Oscar Pistorius: Drama of the courtroom