Deformation behavior of NiTi/polymer shape memory alloy composites - Experimental verifications
Deformation behavior of NiTi/polymer shape memory alloy composites - Experimental verifications
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DOI：
10.1177/0021998304040553
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发表时间：
2004-01-01
影响因子：
2.9
通讯作者：
Ishii, H
中科院分区：
文献类型：
--
作者：
Murasawa, G;Tohgo, K;Ishii, H
采用注射成型技术制备了NiTi形状记忆合金（SMA）长纤维、短纤维和Ti长纤维在聚碳酸酯（PC）基体中的复合材料。制备了预应变SMA长纤维/环氧树脂基复合材料。（1）SMA长纤维和短纤维复合材料（SMAC）的断裂行为-单轴拉伸断裂试验。(2)热-机械变形行为-伪弹性（PE）长纤维/PC基复合材料的拉伸加载-卸载试验。通过对形状记忆效应（SME）长纤维/PC基复合材料和SME长纤维/环氧树脂基复合材料的热机械加载试验，得到以下结果：（1）形状记忆合金复合材料（SMAC）的应力-应变关系表现为应力的反复升降，对应于试样的颈缩、纤维断裂和基体断裂。SMAC中颈缩起始应变和纤维或基体断裂应变均高于Ti复合材料。这是由于SMA纤维的应力诱发马氏体相变所伴随的独特的应力-应变关系。(2)含PE纤维和PC的SMAC在拉伸加载-卸载过程中表现出类伪弹性变形。(3)含有SME纤维和PC的SMAC在拉伸加载-卸载后通过加热表现出较大的收缩，但在该过程中预期的基体中的压缩残余应力并不显著。然而，通过在基体中嵌入预应变纤维，基体中的压缩残余应力可能变得更大。
Composites containing NiTi shape memory alloy (SMA) long-fiber, short-fibers or Ti long-fiber in a Polycarbonate (PC) matrix have been fabricated by the injection molding technique. Also, prestrained SMA long-fiber/Epoxy matrix composites have been fabricated. The fracture behavior and thermo-mechanical deformation behavior are examined; (1) Fracture behavior - uniaxial tensile tests up to fracture for SMA long-fiber and short-fiber composite (SMAC). (2) Thermo-mechanical deformation behavior - tensile loading-unloading tests for Pseudoelastic (PE) long-fiber/PC matrix composites. Several thermo-mechanical loading tests for Shape Memory Effect (SME) long-fiber/PC matrix and SME long-fiber/Epoxy matrix composites were used.The obtained results are as follows: (1) The stress-strain relation up to the final fracture of the Shape Memory Alloy Composites (SMACs) showed the repeated up-and-down of the stress which corresponds to the necking of the specimen, fiber fracture, and matrix fracture. The strain for the initiation of necking and the strain for the fiber or matrix fracture in the SMACs were higher than those in the Ti composite. This is attributed to the unique stress-strain relations accompanied by the stress-induced martensitic transformation of the SMA fibers. (2) The SMAC containing PE fiber and PC exhibited the pseudoelastic-like deformation under tensile loading-unloading. (3) The SMAC containing SME fiber and PC exhibited the large contraction by heating after tensile loading-unloading, but the compressive residual stress in the matrix expected in this process was not remarkable. However, compressive residual stress in the matrix may become greater by embedding prestrained fiber in the matrix.