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首页> 外文期刊>JSME International Journal. Series A, Solid mechanics and material engineering >Static Debonding Initiation Stress of Fiber Glass Composite
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Static Debonding Initiation Stress of Fiber Glass Composite

机译：玻璃纤维复合材料的静态脱胶起始应力

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摘要

Mesoscale debonding initiation stress of a bundle of glass fibers and epoxy matrix under static loading is investigated. A special cylindrical bar specimen was designed for the experiment. The specimen contains a bundle of glass fibers in the center and the bundle diameters were 1 and 2 mm. The fiber diameter is 7μm. A static tension test was performed under the displacement control. The applied load-displacement curve was recorded for each specimen and then the debonding initiation load was defined as the deviation point from the linear curve. In addition, the debonding length was measured directly from the tested specimen. Using the debonding load measured from experiment, an axisymmetric finite element analysis is performed and debonding parameters K_1 and K_2 were computed. The results show the debonding initiation is fully dominated by an opening mode rather than a sliding mode and the stress intensity factor K_1 for the debonding initiation is 2.0E+05 Pa m~(1/2). The mixed mode fracture takes place in the debonding propagation with constant mode mixity around 41.0 degree and the averaged stress intensity factors are 1.67E+05 Pa m~(1/2) and 1.41E+05 Pa m~(1/2) for the opening and the sliding mode, respectively.
机译：研究了一束玻璃纤维和环氧基质在静态载荷下的中尺度脱胶起始应力。为实验设计了特殊的圆柱条形试样。标本的中央有一束玻璃纤维，束直径分别为1和2 mm。纤维直径为7μm。在位移控制下进行静张力测试。记录每个样品的施加的载荷-位移曲线，然后将剥离起始载荷定义为与线性曲线的偏离点。另外，直接从测试样品测量剥离长度。利用实验测得的脱胶载荷，进行轴对称有限元分析，计算出脱胶参数K_1和K_2。结果表明，脱胶起始完全由开放模式主导，而不是滑动模式，且脱胶起始的应力强度因子K_1为2.0E + 05 Pa m〜（1/2）。混合模式断裂发生在脱胶扩展过程中，在41.0度附近以恒定模式混合发生，平均应力强度因子为1.67E + 05 Pa m〜（1/2）和1.41E + 05 Pa m〜（1/2）。分别为打开和滑动模式。

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