Fracture Mechanics Analysis of the Fibre Fragmentation Test
Fracture Mechanics Analysis of the Fibre Fragmentation Test
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纤维断裂试验的断裂力学分析
DOI：
10.1177/002199839502900703
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发表时间：
1995
影响因子：
2.9
通讯作者：
Y. Mai
中科院分区：
文献类型：
--
作者：
Li;Jang‐Kyo Kim;C. Baillie;Y. Mai
对单纤维断裂试验中的应力传递问题提出了一种改进的细观力学分析方法。考虑部分脱粘界面作为最一般的情况下，格里菲斯的断裂力学方法推导出在纤维基体界面脱粘准则。来自威布尔统计的平均纤维强度模型用于确定作为施加应力的函数的平均纤维片段长度。碳纤维-环氧树脂复合材料的参数研究表明，存在一个临界应力，低于该应力时，界面不发生脱粘。泊松效应增加了界面剪切应力在脱粘区域朝向纤维端部，这反过来又阻碍了进一步脱粘传播。平均纤维片段长度是结合长度和脱结合长度的总和，并且对于含有在大于临界水平的给定施加应力下具有较高表面处理水平的纤维的复合材料而言显著更小。
An improved micromechanics analysis is developed for the stress transfer in the single fibre fragmentation test. Considering the partially debonded interface as the most general case, Griffith's fracture mechanics approach is employed to derive a debond criterion at the fibre-matrix interface. An average fibre strength model from the Weibull statistics is used to determine the mean fibre fragment length as a function of applied stress. A parametric study for a carbon fibre-epoxy matrix composite shows that there is a critical applied stress below which no interfacial debonding takes place. The Poisson effect increases the interface shear stress at the debonded region towards the fibre ends, which in turn discourages further debond propagation. The mean fibre fragment length is the sum of the bonded and debonded lengths, and is substantially smaller for the composite containing fibres with a higher surface treatment level at a given applied stress greater than the critical level.