NiTi形状记忆合金的拉伸实验与物理模型 |
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作者姓名: | 胡自力 王鑫伟 熊克 |
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作者单位: | 南京航空航天大学智能材料与结构航空科技重点实验室,南京航空航天大学智能材料与结构航空科技重点实验室,南京航空航天大学智能材料与结构航空科技重点实验室 南京,210016,中国,南京,210016,中国,南京,210016,中国 |
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基金项目: | 国家自然科学基金(10072026)资助项目,航空科学基金(01G52041)资助项目。~~ |
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摘 要: | 根据NiTi丝的拉伸实验结果,基于滞后元方法,建立了拉伸状态下应力-应变曲线的唯象物理模型,并进行了数值模拟。研究结果表明(1)SMA丝在马氏体相变,特别是R相变时出现一系列物理、力学性质的异常变化,其应力-应变关系呈现高度非线性;(2)在NiTi丝断裂之前没有明显的屈服现象;(3)物理模型的数值模拟结果与实验结果吻合较好。
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关 键 词: | 形状记忆合金 拉伸实验 物理模型 数值模拟 本构关系 |
TENSILE TEST AND PHYSICAL MODEL OF NiTi SHAPE MEMORY ALLOY |
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Authors: | HU Zi-li WANG Xin-wei XIONG Ke |
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Abstract: | The tensile stress-strain curves of NiTi wires are obtained by tensile experiments under different heat treatments. A phenomenological physical model based on hysteresis element method is developed to describe the experimentally determined stress-strain curves of shape memory alloy (SMA) wires. Numerical simulations are made. Simulation results show that: (1) a series of unusual changes on physical and mechanical properties of SMA wires occur when martensitic, especially R(rhombohedral) phase transformation emerge. The stress-strain relation of SMA wires is highly non-linear; (2) there are no notable yielding phenomena before NiTi wires are broken; (3) numerical results obtained by the physical model are in good agreement with experimental data. |
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Keywords: | SMA tensile test physical model numerical simulation constitutive relation |
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