| 不同泊松比复合材料的层板断裂韧性和裂纹尖端应力场 |
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| 引用本文： | 张耀强,刘文庆.不同泊松比复合材料的层板断裂韧性和裂纹尖端应力场[J].纤维复合材料,2006,23(4):7-9,35. |
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| 作者姓名： | 张耀强 刘文庆 |
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| 作者单位： | 1. 河南科技大学,洛阳,471003
2. 上海大学分析测试中心,上海,200444 |
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| 摘 要： | 比较了两组具有不同平面泊松比的玻璃纤维／环氧树脂复合材料层板的断裂韧性和缺口断裂强度，发现低泊松比复合材料层板具有较高的断裂韧性和缺口断裂强度；用复变函数一变分方法计算了它们的裂纹尖端应力场；研究了主应力方向与纤维夹角的关系；结果表明：低泊松比材料独特的裂纹尖端应力场有利于提高缺口断裂强度。
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| 关 键 词： | 泊松比 裂纹 断裂强度 应力场 复合材料 |
Near-tip Stress Field of Crack and Fracture Toughness in Composites with Different Poisson's Ratio |
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| ZHANG Yao-qiang,LIU Wen-qing.Near-tip Stress Field of Crack and Fracture Toughness in Composites with Different Poisson''''s Ratio[J].Fiber Composites,2006,23(4):7-9,35. |
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| Authors: | ZHANG Yao-qiang LIU Wen-qing |
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| Abstract: | The fracture toughness and notch fracture strength of two kinds of composites laminates with different plane-Poisson ratio is compared.It is found that the fracture toughness and notch fracture strength of composites with low Poisson ratio is higher than that with the balanced laminates.Their near-tip stress field of crack is studied with the complex variable-variational method.The relation between principal stress orientation and fiber orientation is also studies in this paper.The result shows that the unique near-tip stress field of crack in these laminates with low Poisson's ratio is helpful to improve the notch fracture strength. |
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| Keywords: | Poisson's ratio Crack Fracture strength Stress field Composites |
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