摘要
为研究基于形状记忆合金(Shape Memory Alloy,SMA)的超弹性复合板驱动与回复响应,开展了一系列NiTi丝/硅橡胶复合材料板的弯曲-回复实验,通过对比不同结构形式的复合板在不同温度条件下的加卸载力-位移曲线,分析、探讨了NiTi丝直径、排布和组分占比对这类超弹性复合体系驱动-回复性能的影响及温度作用机理。立足于实验结果,在现有水平下提出了一种SMA与橡胶材料复合制作、通电加热式驱动、响应时间短的可折叠/展开翼板。研究结果表明,温度诱发的SMA内部相变可充分发挥其形状记忆效应,且同一温度下,合金丝直径、数量和体积分数占比的增加均会改善SMA/橡胶复合材料板的驱动-回复性能。在复合板承受弯曲加卸载的过程中,橡胶基体应变能的储存与释放是促成整个体系变形回复的重要因素,这一作用在低温状态,即SMA并未体现出形状记忆效应时尤其显著。
In order to study the driving mechanism and recovery response of soft composites made of shape memory alloy and rubber elastomer,a series of bending-recovery experiments for NiTi wire/silicone composite plates were carried out.By comparing the load-unloading force-displacement curves of composite plates with different wire arrangements at different temperatures,we analyzed the factors related to diameter,structural configuration and volume ratio of NiTi wires affecting upon the driving-recovery property of this kind of hyper-elastic smart system,and then discussed the influence of temperature.Based on the experimental results,a foldable wing panel made of SMA and rubber elastomer,which can be easily actuated by electric heating within short time,is proposed at the current level.Test results show that the phase transformation induced by temperature variation can significantly improve the bending-recovery performance of NiTi/silicone composite plates,and their driving-recovery ability can exhibit obvious improvement accompanying with the increase of diameter,amounts and volume ration of the SMA component under a certain degree of temperature.In addition,the storage and release of the strain energy from rubber matrix plays an important role to realize the deformation recovery of entire system,during its bending and unbending process.This phenomenon is especially distinct under the case of room temperature,when the SMA does not show any shape memory effect.
作者
刘旭
朱增辉
李旭
刘记立
LIU Xu;ZHU Zenghui;LI Xu;LIU Jili(Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics,Wuhan University of Technology,Wuhan 430070,Hubei,China)
出处
《实验力学》
CSCD
北大核心
2022年第4期517-527,共11页
Journal of Experimental Mechanics
基金
国家自然科学基金(11502181、51974217)资助
国家级大学生创新创业训练计划(S202010497136)资助。
