Thermomechanical training and structural tests for adaptive SMA bumps with two-way shape memory effect

Thermomechanical training and structural tests for adaptive SMA bumps with two-way shape memory effect
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具有双向形状记忆效应的自适应 SMA 凸块的热机械训练和结构测试

DOI:
10.1177/1045389x211048227
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发表时间:
2021-10
影响因子:
2.7
通讯作者:
裘进浩
裘进浩
中科院分区:
材料科学3区
文献类型:
--
作者:
张琛;季宏丽;陈兴;裘进浩

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本文通过简单而有效的训练方法对具有双向形状记忆效应(TWSME)的形状记忆合金(SMA)凸块进行训练,为机翼冲击控制凸块(SCB)的驱动提供了新思路。设计并制造了两种不同配置的凸块结构(2D 和 3D SMA 凸块)。凸块需要表现出 TWSME,以便它可以通过分别在奥氏体相和马氏体相的两个稳定状态之间加热和冷却来改变其形状。为了获得 TWSME,材料在马氏体最终温度和奥氏体最终温度范围内进行训练,同时施加位移边界条件。一组可组装到万能试验机 (UTM) 上的夹具设计用于在训练过程的热循环期间实现夹紧边界条件。经过训练,得到了 SMA 与 TWSME 的凹凸,低温时凸出,高温时变平。随后进行结构测试和变形控制,以显示训练后的 SMA 凸块的变形性能。
In this paper, shape memory alloy (SMA) bumps with two-way shape memory effect (TWSME) are trained by simple but effective training approaches, which provides a new idea for the actuations of the shock control bump (SCB) on airfoil. Two different configurations of bump structures (2D and 3D SMA bumps) are designed and fabricated. The bumps are required to exhibit TWSME so that it can change its shape by heating and cooling between two stable states at austenitic phase and martensitic phase, respectively. To obtain the TWSME, the material is trained in the range of martensitic finish temperature and austenitic finish temperature whilst a displacement boundary condition is imposed. A set of fixtures, which can be assembled to the universal testing machine (UTM), are designed to achieve the clamped boundary condition during thermal cycles of the training process. After training, SMA bumps with the TWSME, that bulge at low-temperature and become flat at high, are obtained. Structural tests and deformation control are then carried out afterwards to show the deformation performance of the trained SMA bumps.
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