Deformation behavior of TiNi shape memory alloy under strain- or stress-controlled conditions
Deformation behavior of TiNi shape memory alloy under strain- or stress-controlled conditions
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DOI：
10.1117/12.474995
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发表时间：
2002-07
期刊：
影响因子：
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通讯作者：
H. Tobushi;K. Okumura;Masato Endo;Kikuaki Tanaka
中科院分区：
文献类型：
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作者：
H. Tobushi;K. Okumura;Masato Endo;Kikuaki Tanaka
对TiNi形状记忆合金在应变控制和应力控制下的变形特性进行了实验研究。所得结果总结如下：在全回路情况下，应力控制条件下的应力-应变曲线与应变控制条件下的应力-应变曲线相似。在应力诱发马氏体相变的起始点上不出现过冲和过冲。在应力控制条件下的亚环下，卸载过程初期由于马氏体相变，温度降低，应变增大。在加载初期，由于反向转变，温度升高，应变减小。在应力控制条件下的子回路中，加载和卸载过程中马氏体相变的起始应力和反向相变的起始应力分别与应变控制条件下低应变速率下的相变应力重合。应力控制条件下的子环变形行为由马氏体相变进行的条件决定。在应力控制条件下，恒温循环加载下的变形行为也由马氏体相变的进展条件决定。
The deformation properties of TiNi shape memory alloy subjected to strain control and stress control were investigated experimentally. The result obtained are summarized as follows. In the case of full loop, the stress- strain curves under stress-controlled condition are similar to those under strain-controlled condition with high strain rate. The overshoot and undershoot do not appear at the start points of the stress-induced martensitic transformation in these curves. In the case of subloop under stress-controlled condition, temperature decreases and therefore strain increases owing to the martensitic transformation at the early stage in the unloading process. At the early stage in the reloading process, temperature increase and therefore strain decease owing to the reverse transformation. In the case of subloop under stress- controlled condition, the starting stresses of the martensitic transformation and the reverse transformation in the loading and unloading processes coincide with the transformation stresses under strain-controlled condition with low strain rate, respectively. The deformation behaviors for subloop under stress-controlled condition are prescribed by the condition for progress of the martensitic transformation based on the transformation kinetics. The deformation behaviors subjected to cyclic loading under stress-controlled condition at constant temperature are also prescribed by the condition for progress of the martensitic transformation.