Recovery performance and characteristics in shape memory effects of aliphatic polyether urethane
Recovery performance and characteristics in shape memory effects of aliphatic polyether urethane
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DOI：
10.1002/pat.3133
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发表时间：
2013-07
影响因子：
3.4
通讯作者：
Ling Luo;Xiaoxia Wang;Yuxi Jia;Z. Wang
中科院分区：
文献类型：
--
作者：
Ling Luo;Xiaoxia Wang;Yuxi Jia;Z. Wang
对形状记忆聚合物及其复合材料的形状记忆效应的恢复性能和特点进行分析，有助于形状记忆聚合物及其复合材料的优化设计和工程应用。为了研究形状记忆恢复性能与材料参数和加载条件之间的关系，以脂肪族聚醚型聚氨酯为例，采用三维粘弹性模型对形状记忆行为进行了数值模拟。该模型的材料参数取自应力松弛试验，而不是动态力学分析试验。分析了应变控制形状记忆过程中无约束和有约束的回复行为。结果表明，无约束恢复发生在相同的温度下，无论施加的应变值。另一个有趣的结果是，在无约束恢复情况下的形状恢复温度增加，在约束恢复条件下的最大恢复应力随着加热速率的增加而减小。版权所有© 2013约翰威利父子有限公司.
The analysis on the recovery performance and characteristics in shape memory effects is helpful for the optimal design and engineering applications of shape memory polymers and their composites. To investigate the relationships among recovery performance, material parameters, and loading conditions, by taking aliphatic polyether urethane as an example, the researchers simulate the shape memory behaviors numerically using a three-dimensional viscoelastic model. The material parameters for this model are taken from stress relaxation tests, rather than dynamic mechanical analysis tests. Both the unconstrained and the constrained recovery behaviors during strain-controlled shape memory processes are analyzed. The results reveal that the unconstrained recovery occurs at the same temperature regardless of the applied strain values. Another interesting result is that the shape recovery temperature in unconstrained recovery situations increases and the maximum recovery stress under constrained recovery conditions decreases with the increase of heating rates. Copyright © 2013 John Wiley & Sons, Ltd.