Mechanical and electrical behavior of carbon fiber structural capacitors: Effects of delamination and interlaminar damage
Mechanical and electrical behavior of carbon fiber structural capacitors: Effects of delamination and interlaminar damage
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DOI：
10.1016/j.compstruct.2016.12.062
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发表时间：
2017-04-15
影响因子：
6.3
通讯作者：
Zhou, Hongyu
中科院分区：
文献类型：
--
作者：
Shen, Zhenglai;Zhou, Hongyu
研究了分层和层间损伤对碳纤维结构电容器（CFSC）材料力学性能的影响。通过对三种介质和四种铺层结构的CFSCs进行单向拉伸和双悬臂梁试验，研究了CFSCs的力学性能和电容变化规律。电容的退化被测量为施加机械负载的函数。总体而言，CFSCs的承载能力低于碳纤维增强环氧树脂。在加载初期，介电/碳纤维界面会产生层间损伤，导致电容衰减和层压过早失效。介质材料和铺层结构对CFSC的力学性能和电学性能都有影响。一般来说，更薄的介电隔膜导致更高的标称强度和更高的初始电容。载荷引起的电容劣化主要是层间损伤引起的，载荷下的电容保持很大程度上取决于隔膜与基体聚合物之间的界面断裂韧性。最后，建立了考虑隔膜材料类型、纤维编织模式和界面裂纹扩展等因素的电容衰减模型（CDM）。(C) 2016 Elsevier Ltd.版权所有。
This paper studies the effects of delamination and interlaminar damage on the mechanical and electrical performance of carbon-fiber structural capacitor (CFSC) materials. An experimental program was carried out to characterize the mechanical behavior and electrical capacitance change of CFSCs, where unidirectional tension and double cantilever beam tests were performed on specimens having three dielectrics and four layup configurations. The degradation of electric capacitance was measured as a function of the applied mechanical load. Generally, the load-bearing capacities of CFSCs are lower than their carbon-fiber reinforced epoxy counterparts. Interlaminar damage initiates at the dielectric/carbon fiber interface during early stages of loading, causing capacitance decay and premature laminate failure. The dielectric material and layup configuration have impacts on both mechanical and electrical properties of the CFSC. In general, thinner dielectric separators lead to higher nominal strength and higher initial capacitance. Moreover, it was found that the load-induced capacitance deterioration is mainly attributed to interlaminar damage, and the electrical capacitance retention under loading depends largely on the interfacial fracture toughness between the separator and matrix polymer. Lastly, a capacitance deterioration model (CDM) was derived to calculate the capacitance decay taking account factors including the separator material type, fiber weave-pattern, and interfacial cracks propagation. (C) 2016 Elsevier Ltd. All rights reserved.