Elastic Fibre Prestressing Mechanics within a Polymeric Matrix Composite

被引:10
作者
Chen, Hui [1 ]
Yu, Folian [1 ]
Wang, Bing [1 ]
Zhao, Chenmin [1 ]
Chen, Xiayu [1 ]
Nsengiyumva, Walter [1 ]
Zhong, Shuncong [1 ]
机构
[1] Fuzhou Univ, Sch Mech Engn & Automation, Fujian Prov Key Lab Terahertz Funct Devices & Inte, Fuzhou 350108, Peoples R China
基金
中国国家自然科学基金;
关键词
carbon-fibre-reinforced polymeric composite; prestress; elasticity and viscoelasticity; fibre; matrix interface; in-plane stress; mechanics; RESIDUAL-STRESSES; PART III; REDUCTION; CURE;
D O I
10.3390/polym15020431
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The elastic fibre prestressing (EFP) technique has been developed to balance the thermal residual stress generated during curing of a polymeric composite. The continuous fibre reinforcements are prestressed and then impregnated into a polymeric matrix, where the prestress load is only removed after the resin is fully cured in order to produce an elastically prestressed polymeric matrix composite (EPPMC). Although the EFP is active in improving the static mechanical performance of a composite, its mechanics on dynamic mechanical performance and viscoelasticity of a composite is still limited. Here, we established a theoretical model in order to decouple the EFP principle, aiming to better analyse the underlying mechanics. A bespoke fibre prestressing rig was then developed to apply tension on a unidirectional carbon-fibre-reinforced epoxy prepreg to produce EPPMC samples with various EFP levels. The effects of EFP were then investigated by carrying out both static and dynamic mechanical testing, as well as the viscoelastic creep performance. It was found that there is an optimal level of EFP in order to maximise the prestress benefits, whilst the EFP is detrimental to the fibre/matrix interface. The EFP mechanisms are then proposed based on these observations to reveal the in-plane stress evolutions within a polymeric composite.
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页数:17
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