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Nonlinear fracture mechanics for ferroelastic materials

机译:铁弹性材料的非线性断裂力学

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Nonlinear fracture mechanics concepts for ferroelastic materials are presented. A phenomenological constitutive law for ferroelastic domain switching is implemented within a steady state finite element formulation to determine the stress and strain fields near growing cracks in ferroelastic materials. Hutchinson's I-integral is applied to determine the relationship between the far field applied energy release rate and the local crack tip energy release rate. Computations are performed on both unpoled and "mechanically poled" materials with and without T-stress to quantitatively determine the toughening due to domain switching in these situations. Results are discussed in comparison to "transformations toughening" type analytical models.
机译:提出了铁弹性材料的非线性断裂力学概念。在稳态有限元公式中实施了铁弹性域转换的现象本构定律,以确定铁弹性材料中裂纹扩展附近的应力场和应变场。 Hutchinson的I积分用于确定远场施加的能量释放速率与局部裂纹尖端能量释放速率之间的关系。在有和没有T应力的情况下,对非极化材料和“机械极化”材料都进行计算,以定量确定在这些情况下由于磁畴转换而引起的增韧。与“变形强化”类型的分析模型相比,讨论了结果。

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