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Predicting whether a material is ductile or brittle
Current Opinion in Solid State & Materials Science ( IF 11.0 ) Pub Date : 2018-04-30
R.P. Thompson, W.J. Clegg

In this paper we discuss the various models that have been used to predict whether a material will tend to be ductile or brittle. The most widely used is the Pugh ratio, G/KG/K, but we also examine the Cauchy pressure as defined by Pettifor, a combined criterion proposed by Niu, the Rice and Thomson model, the Rice model, and the Zhou-Carlsson-Thomson model. We argue that no simple model that works on the basis of simple relations of bulk polycrystalline properties can represent the failure mode of different materials, particularly where geometric effects occur, such as small sample sizes. Instead the processes of flow and fracture must be considered in detail for each material structure, in particular the effects of crystal structure on these processes.



中文翻译:

预测材料是韧性的还是脆性的

在本文中,我们讨论了已用于预测材料是趋于延性还是易碎的各种模型。使用最广泛的是Pugh比,G / KG/ķ,但我们还研究了Pettifor定义的柯西压力,这是由Niu,Rice and Thomson模型,Rice模型以及Zhou-Carlsson-Thomson模型提出的组合标准。我们认为,没有基于简单多晶性质简单关系的简单模型可以代表不同材料的失效模式,特别是在发生几何效应(例如小样本量)的情况下。相反,必须针对每种材料结构详细考虑流动和断裂的过程,尤其是晶体结构对这些过程的影响。

更新日期:2018-05-01
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