各向异性强度和刚度在控制多晶固体屈服的开始和扩展中的作用
Role of anisotropic strength and stiffness in governing the initiation and propagation of yielding in polycrystalline solids
摘要：
定向强度与刚度的比率在控制多晶聚集体内的单个晶体在聚集体被加载时将屈服的相对顺序方面是重要的。在本文中，制定了一个强度刚度参数的多轴加载，扩展了单轴加载的黄和道森的发展。建立在强度刚度的原则，预测的宏观应力在有限元网格屈服的方法。该分析使用来自纯弹性有限元模拟的一个增量的弹性应变数据来进行预测，给出单晶屈服面的知识。通过对奥氏体无应变钢AL6XN的模拟，验证了强度刚度参数和屈服预测方法的有效性。
英文摘要：
The ratio of directional strength-to-stiffness is important in governing the relative order in which individual crystals within a polycrystalline aggregate will yield as the aggregate is loaded. In this paper, a strength-to-stiffness parameter is formulated for multiaxial loading that extends the development of Wong and Dawson for uniaxial loading. Building on the principle of strength-to-stiffness, a methodology for predicting the macroscopic stresses at which elements in a finite element mesh yield is developed. This analysis uses elastic strain data from one increment of a purely elastic finite element simulation to make the prediction, given knowledge of the single-crystal yield surface. Simulations of austenitic strainless steel AL6XN are used to demonstrated the effectivness of the strength-to-stiffness parameter and yield prediction methodology.
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