Matrix and interface microcracking in carbon fiber/polymer structural micro-battery
Matrix and interface microcracking in carbon fiber/polymer structural micro-battery
复制标题
碳纤维/聚合物结构微电池中的基体和界面微裂纹
DOI：
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发表时间：
2019
影响因子：
2.9
通讯作者：
J. Varna
中科院分区：
文献类型：
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作者：
Johanna Xu;J. Varna
本文对单向碳纤维结构微电池复合材料涂层/基体界面上径向基体裂纹和脱粘裂纹的扩展进行了数值研究。这种微型电池由固体电解质涂层碳纤维嵌入电化学活性聚合物基质中组成。应力分析表明，充注过程中基体中较高的环向应力可能在涂层/基体界面处引发径向基体裂纹。采用不同纤维排列方式和其他基体裂纹横向平面的二维有限元模型，分析了方形纤维填充复合材料中中心纤维在涂层/基体界面处的径向基体裂纹扩展。计算了纯电化学载荷下径向裂纹沿两种潜在扩展路径的能量释放率。径向基体裂纹的存在会改变沿涂层/基体界面的应力分布，从而使剥离成为需要考虑的问题。能量释放率结果表明，裂纹扩展受模式II控制。
In this paper, the propagation of radial matrix cracks and debond cracks at the coating/matrix interface in unidirectional carbon fiber structural micro-battery composite are studied numerically. The micro battery consists of a solid electrolyte-coated carbon fiber embedded in an electrochemically active polymer matrix. Stress analysis shows that high hoop stress in the matrix during charging may initiate radial matrix cracks at the coating/matrix interface. Several 2-D finite element models of the transverse plane with different arrangements of fibers and other matrix cracks were used to analyze the radial matrix crack growth from the coating/matrix interface of the central fiber in a composite with a square packing of fibers. Energy release rates of radial cracks along two potential propagation paths are calculated under pure electrochemical loading. The presence of a radial matrix crack imposes changes in the stress distribution along the coating/matrix interface, making debonding relevant for consideration. Results for energy release rates show that the debond crack growth is governed by mode II.