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lidongze

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Crack path deflection reduces crack growth rates in two ways: (i) it causes a direct reduction of the local driving force for crack propagation and an increase in the total length of crack path which results in lower nominal crack growth rates [5,7,23,24]; and (ii) it induces roughness-induced crack closure, resulting in a reduction of the stress intensity range experienced at the crack tip from the nominally applied value DK to the effective value DKeff. These two effects are referred to as extrinsic retardation mechanisms [25].
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楠楠monkey

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爱与雨下(金币+1): 2012-03-10 17:14:24
爱与雨下: 金币+15 2012-03-22 18:53:24
爱与雨下: , bb代发! 2012-03-22 18:53:44
爱与雨下: 翻译EPI+1 2012-03-22 18:53:59
裂纹路径偏转在两个方面降低裂纹扩展速率:(1)导致裂纹扩展局部驱动力的直接减小,裂纹路径总长度的增加,从而导致较低的名义裂纹增长率;(2)引发粗糙度诱发裂纹闭合,从而导致应力强度范围的减小,经历了裂纹间断从名义应用价值DK 到有效价值DKeff.的过程。这两种影响被称为外在延迟机制。
2楼2012-03-10 16:25:25
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