Crack Tip Dislocation Nucleation in FCC Solids

Crack Tip Dislocation Nucleation in FCC Solids
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FCC 固体中的裂纹尖端位错成核

DOI:
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发表时间:
1999
期刊:
影响因子:
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通讯作者:
K. Sieradzki
K. Sieradzki
中科院分区:
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文献类型:
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作者:
J. Knap;K. Sieradzki

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我们目前的分子动力学模拟的结果,旨在研究裂纹尖端位错发射面心立方固体。根据该问题的最新连续统公式分析了结果。在模式II中,Au,Pd和Pt显示了一个新的意想不到的机制,裂纹尖端位错发射涉及创建一对肖克莱偏在一个平面以下的裂纹平面上的滑移面。在模式I中,对于所研究的所有材料,Rice{close_quote}的连续介质公式[J. thumether-mech. thumether-phys. thumether-solids {bold 40},239(1992)]将位错发射的应力强度低估了几乎2倍。对排放标准的表面应力修正使连续预测和模拟之间的一致性在20%以内。{版权} {美国物理学会}
We present results of molecular dynamic simulations aimed at examining crack tip dislocation emission in fcc solids. The results are analyzed in terms of recent continuum formulations of this problem. In mode II, Au, Pd, and Pt displayed a new unanticipated mechanism of crack tip dislocation emission involving the creation of a pair of Shockley partials on a slip plane one plane below the crack plane. In mode I, for all the materials examined, Rice{close_quote}s continuum formulation [J.thinspthinspMech.thinspthinspPhys.thinspthinspSolids {bold 40}, 239 (1992)] underestimated the stress intensity for dislocation emission by almost a factor of 2. Surface stress corrections to the emission criterion brought the agreement between continuum predictions and simulations to within 20{percent}. {copyright} {ital 1999} {ital The American Physical Society}