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首页> 外文期刊>International Journal of Plasticity >Modeling of slip, twinning and transformation induced plastic deformation for TWIP steel based on crystal plasticity
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Modeling of slip, twinning and transformation induced plastic deformation for TWIP steel based on crystal plasticity

机译：基于晶体塑性的TWIP钢滑移，孪生和相变诱发塑性变形建模

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One of the most critical issues in development of micromechanics models for TWIP steel is to establish the continuum constitutive model which can accurately represent and model the characteristic plastic deformation at macro level. However, the uncertainty in describing the evolution of state variables based on crystal plasticity theory poses a great challenge in handling the complex plastic deformation with different deformation mechanisms and their complicated interactions and interplays at microscopic scale and thus becomes a non-trivial issue. Many attempts to address this issue by coupling slip and twinning or slip and transformation have been proven to be efficient via comparing and corroborating the predicted texture evolution using crystal plasticity theory with experiment. An accurate constitutive model, however, needs to be established to articulate and model the interactions of slip, twinning and transformation, which have been observed in experiment. In this paper, a micromechanics model for modeling of slip, twinning and transformation induced plasticity of twinning-induced plasticity (TWIP) steel is proposed by using the crystal plasticity approach. The model serves as a feasible approach to reflecting the micro deformation mechanisms during the plastic deformation process of TWIP crystals. The phase transformation is introduced and represented by the rate-dependent constitutive model. The algorithms for realization of the developed model are implemented in ABAQUS/Standard platform using UMAT. Furthermore, different deformation mechanisms of the microscopic plastic deformation modes of TWIP steel are analyzed based on the proposed models. The simulation results by using the developed model reveals that both twinning and transformation have an obvious effect on hardening and transformation, which cause the decrease of stress of single crystal, and the sequence of transformation and twinning rotation can be determined according to the proposed model. (C) 2015 Elsevier Ltd. All rights reserved.
机译：TWIP钢微力学模型开发中最关键的问题之一是建立连续体本构模型，该模型可以在宏观水平上准确地表示和建模特征塑性变形。然而，基于晶体可塑性理论描述状态变量演化的不确定性在处理具有不同变形机制的复杂塑性变形以及它们在微观尺度上复杂的相互作用和相互作用时提出了巨大的挑战，因此成为一个不小的问题。通过使用晶体可塑性理论与实验比较和证实预测的织构演变，已证明许多通过结合滑动和孪生或滑动和变形来解决该问题的尝试是有效的。然而，需要建立一个精确的本构模型，以阐明和模拟滑移，孪生和相变的相互作用，这已在实验中观察到。本文提出了一种利用结晶可塑性方法对滑移，孪生和相变诱发塑性进行建模的微力学模型。该模型是反映TWIP晶体塑性变形过程中微变形机制的可行方法。引入了相变并由速率相关的本构模型表示。使用UMAT在ABAQUS / Standard平台中实现用于开发模型的算法。在此基础上，分析了TWIP钢微观塑性变形模式的不同变形机理。利用开发的模型进行的仿真结果表明，孪生和相变对硬化和相变均具有明显的影响，从而导致单晶应力的降低，并且可以根据所提出的模型确定相变和孪生旋转的顺序。 （C）2015 Elsevier Ltd.保留所有权利。

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