Impact of Strain Rate on Thermomechanical Coupling Effects in TiNi SMA Subjected to Compression
Impact of Strain Rate on Thermomechanical Coupling Effects in TiNi SMA Subjected to Compression
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DOI：
10.2320/matertrans.m2012212
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发表时间：
2012-11
影响因子：
1.2
通讯作者：
E. Pieczyska;H. Tobushi;K. Kulasinski;K. Takeda
中科院分区：
文献类型：
--
作者：
E. Pieczyska;H. Tobushi;K. Kulasinski;K. Takeda
在本研究中，研究了经过压缩试验的TiNi形状记忆合金中伴随应力诱导马氏体转变的热机械耦合效应。详细阐述了机械特性，并通过快速灵敏的红外相机以非接触方式测量与放热马氏体正向转变和吸热反向转变相关的温度变化。获得的样本温度变化取决于所施加的应变率。在较高的应变率下，观察到更大的温度变化，因为流向周围环境的热流较低并且该过程更接近绝热条件。形状记忆合金的温度变化显着影响其应力应变特性。此外，还计算了不同应变率下压缩循环期间耗散的能量。研究表明，加载功和可恢复应变能都随着应变率的增加而增加，而耗散能量分数则减少。 [doi:10.2320/matertrans.M2012212]
In this study, the thermomechanical coupling effects accompanying stress-induced martensitic transformation in TiNi shape memory alloy subjected to compression test were investigated. The mechanical characteristics were elaborated and the temperature changes related to the exothermic martensitic forward transformation and the endothermic reverse one were measured in a contactless manner by a fast and sensitive infrared camera. The obtained temperature changes of the specimen depend on the strain rate applied. At higher strain rate, greater temperature changes were observed, because the heat flow to the surroundings was lower and the process was closer to adiabatic conditions. The temperature changes of the shape memory alloy significantly influence its stressstrain characteristics. Moreover, the energy dissipated during a compression cycle was calculated for various strain rates. The study revealed that both the loading work and recoverable strain energy increase with increasing strain rate, while the dissipated energy fraction decreases. [doi:10.2320/matertrans.M2012212]