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首页> 外文期刊>International Journal of Plasticity >Origin of the sensitivity in modeling the glide behaviour of dislocations
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Origin of the sensitivity in modeling the glide behaviour of dislocations

机译:模拟脱位滑动行为的敏感性的起源

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摘要

The sensitivity in predicting glide behaviour of dislocations has been a long-standing problem in the framework of the Peierls-Nabarro model. The predictions of both the model itself and the analytic formulas based on it are too sensitive to the input parameters. In order to reveal the origin of this important problem in materials science, a new empirical-parameter-free formulation is proposed in the same framework. Unlike previous formulations, it includes only a limited small set of parameters all of which can be determined by convergence tests. Under special conditions the new formulation is reduced to its classic counterpart. In the light of this formulation, new relationships between Peierls stresses and the input parameters are identified, where the sensitivity is greatly reduced or even removed.
机译:预测位于脱位的滑行行为的敏感性是Peierls-Nabarro模型的框架中的长期问题。 模型本身和基于它的分析公式的预测对输入参数太敏感。 为了揭示材料科学中这个重要问题的起源,在同一框架中提出了一种新的经验性参数配方。 与以前的配方不同,它仅包括所有有限的一小集参数,所有这些参数都可以通过收敛测试来确定。 在特殊条件下,新配方减少到其经典对应物。 鉴于这种配方,识别PEIERLS应力和输入参数之间的新关系,其中灵敏度大大减少甚至移除。

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