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首页> 外文期刊>Smart Materials & Structures >Constitutive modeling of tension-torsion coupling and tension-compression asymmetry in NiTi shape memory alloys
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Constitutive modeling of tension-torsion coupling and tension-compression asymmetry in NiTi shape memory alloys

机译：NiTi形状记忆合金中的拉扭耦合和拉压不对称本构模型

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A three-dimensional phenomenological model based on microplane theory is extended to capture the coupling effects between tension and torsion in complex multiaxial loadings. Inelastic strain in a microplane approach is a component of transformation strain and anisotropic strain. Since the anisotropy effect is induced during martensitic transformation, anisotropic strain is defined as a function of transformation strain. Out-of-plane strain is induced in simple tension and pure torsion in free-end conditions. Anisotropy tensor is experimentally extracted and is used in the proposed model to predict the behavior in multiaxial loading. The ability of this extended microplane model to predict the tension-torsion coupling effects as well as the induced transformation anisotropic behavior of NiTi shape memory alloys is demonstrated. In addition, the microplane model is modified to capture the asymmetric behavior in tension and compression during uniaxial and multiaxial loadings. To this end, numerical correlations between the results of the modified microplane model are compared with experimental results to demonstrate the validity of the extended model.
机译：扩展了基于微平面理论的三维现象学模型，以捕获复杂多轴载荷下拉伸与扭转之间的耦合效应。微平面方法中的非弹性应变是转变应变和各向异性应变的组成部分。由于在马氏体相变过程中会引起各向异性效应，因此将各向异性应变定义为相变应变的函数。在自由端条件下，简单的拉伸和纯扭转会引起面外应变。通过实验提取各向异性张量，并将其用于所提出的模型中以预测多轴载荷下的行为。证明了这种扩展的微平面模型预测NiTi形状记忆合金的拉扭耦合效应以及诱发的相变各向异性行为的能力。此外，微平面模型经过修改，可以捕获单轴和多轴载荷过程中拉伸和压缩过程中的不对称行为。为此，将改进的微平面模型的结果之间的数值相关性与实验结果进行了比较，以证明扩展模型的有效性。

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