Influence of uniaxial compression on the shape memory behavior of vitrimer composite embedded with tension‐programmed unidirectional shape memory polymer fibers
Influence of uniaxial compression on the shape memory behavior of vitrimer composite embedded with tension‐programmed unidirectional shape memory polymer fibers
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DOI：
10.1002/app.50429
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发表时间：
2021-05
影响因子：
3
通讯作者：
Henry Q. Afful;S. Ibekwe;P. Mensah;Guoqiang Li
中科院分区：
文献类型：
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作者：
Henry Q. Afful;S. Ibekwe;P. Mensah;Guoqiang Li
张力程序化形状记忆聚合物（SMP）纤维已被用作缝合线，用于按照闭合后愈合策略闭合大开口裂缝。然而，复合材料在使用过程中可能会受到压缩载荷。这些压缩载荷会减少这些预张紧纤维中的可恢复应变量，从而限制其闭合裂纹的能力。本研究的目的是研究在使用中的压缩载荷对由SMP纤维和SMP基体组成的复合材料的形状记忆效应（SME）的影响。为此，将预拉伸的形状记忆聚对苯二甲酸乙二醇酯（PET）纤维嵌入形状记忆玻璃体中以获得具有不同纤维体积分数的复合材料样品。研究了PET纤维和玻璃体的SME。研究了压缩载荷对复合材料形状记忆效应的影响。结果表明，复合材料沿着纤维方向的单轴压缩显著降低了预拉伸SMP纤维的收缩能力。因此，这是设计此类自修复复合材料时需要考虑的因素。
Tension programmed shape memory polymer (SMP) fibers have been used as sutures for closing wide‐opened cracks per the close‐then‐heal strategy. However, the composite may be subjected to compression loading during service. These compression loads can reduce the amount of recoverable strain in these pre‐tensioned fibers, limiting their ability to close cracks. The purpose of this study is to investigate the effect of in‐service compression loading on the shape memory effect (SME) of composites consisting of SMP fiber and SMP matrix. To this end, pre‐stretched shape memory Polyethylene Terephthalate (PET) fibers were embedded into a shape memory vitrimer to obtain composite samples with different fiber volume fractions. The SME of both the PET fiber and the vitrimer was investigated. The effect of compression load on the SME of the composite was studied. It is found that, uniaxial compression on the composite along the fiber direction significantly reduced the shrinking ability of the embedded pre‐tensioned SMP fibers. Hence, this is a factor that needs to be considered when designing such types of self‐healing composites.