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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Thermal Boundary Effects on the Process of Creating Recovery Stresses in a SMA Wire Activated by Joule Heating
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Influence of Thermal Boundary Effects on the Process of Creating Recovery Stresses in a SMA Wire Activated by Joule Heating

机译：热边界效应对焦耳加热激活的SMA线中恢复应力的过程的影响

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摘要

The study deals with the influence of thermal boundary effects on the process of creating recovery stresses in a SMAwire activated by Joule heating, during a thermal cycle (up to the return to ambient temperature). First, a thermal characterization is performed using infrared thermography for temperature profile measurements along the wire in a steady-state regime. Second, recovery stress tests are performed using a uniaxial testing machine. Finally, tests are analyzed using a thermomechanical model, taking the inhomogeneous temperature distribution along the wire into account. The influence of the initial distribution of martensite (before thermal activation of the memory effect) is discussed, as well as the influence of the wire length. It is shown that the thermal boundary effects at the contact with the grips of the testing machine significantly influence the response of the wire. For instance, during the heating of the wire, an austenite-to-martensite transformation may occur in the zones near the wire ends (where the temperature remains close to ambient) due to the increased stress. A length of influence of the thermal boundary effects on the overall wire response is defined, and a condition to neglect this influence is proposed. The study highlights the importance of taking thermal boundary effects into account for practical applications of SMAs based on Joule heating.
机译：该研究涉及热边界效应对在热循环（直至返回环境温度）的焦耳加热激活的SMAWIRE中产生恢复应力的过程的影响。首先，使用红外热成像进行热表征，以沿着稳态状态沿线的温度曲线测量进行。其次，使用单轴试验机进行恢复应力测试。最后，使用热机械模型进行分析测试，考虑到电线的不均匀温度分布。讨论了马氏体初始分布的影响（在记忆效果的热激活之前）以及线长度的影响。结果表明，与试验机的夹具接触的热边界效应显着影响了线的响应。例如，在加热线期间，由于压力增加，在线端部（其中温度保持接近环境）附近的区域中可能发生奥氏体对马氏体转换。定义了对整个电线响应的热边界效应的影响的长度，并且提出了忽视这种影响的条件。该研究强调了对基于焦耳加热的SMA实际应用考虑了热边界效应的重要性。

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