SMA粒子和短纤维填充的复合材料的力学特性

Mechanical Properties of Composites Filled with SMA Particles and Short Fibers

形状记忆合金(SMAs)由于其可塑的记忆效果,短期弹性、高阻抗容量和其他特性,因而具有感知和激励的功能。利用SMAs独一无二的特性,结合其他材料可用来制造出智能化或灵敏的合成材料。研究利用镍钛合金短纤维和颗粒制造的环氧合成材料的力学性能。由于加入了SMA,SMA/环氧合成材料具有更强的抗弯抗剪能力。特别在高温下,存储系数随着SMA显著增加。试验结果表明,SMA每增加3.5%,存储系数将有显著的增加,影响量级为环氧的6倍。当SMA相变接近120°时,存储系数增大到了最大值。SMA/ER3合成材料的损失因素随着SMA的增加而增加。基于Halpin-Tsai理论,具有SMA的薄层可以代表整个材料动力性能。相对于其他试验材料,在现有模型上得到的结论可以合理地预测这些动力响应。

Shape memory alloys （SMAs） possess both sensing and actuating functions due to their shape memory effect, pseudo-elasticity, high damping capability and other remarkable properties. Combining the SMAs with other materials can create intelligent or smart composites by utilizing the unique properties of SMAs. In this paper, epoxy resin composites filled with NiTi alloy short fibers and particles were fabricated and their mechanical properties investigated. Owing to the addition of SMA fillers, the flexural rigidity of SMA/epoxy composites increases. Especially, the storage modulus increases remarkably with increasing filler content in the high temperature region. The experimental results show that the addition of just 3.5% of SMA fillers to epoxy resin resulted in a remarkable increment of storage modulus, which is six times as large as that of epoxy bulk （ER3）. The storage modulus reaches the maximum at the SMA phase transformation temperature of approximate 120 ℃. The loss factor of SMA/ER3 composites increases with the increment of SMA filler contents. Based on the Halpin- Tsai theory, moreover, a model for the laminated plates with SMA fillers is presented to predict the dynamic mechanical properties. Compared to the experimental results, reasonable prediction of the dynamic behavior is obtained based on the present models.