| 不同泊松比复合材料的裂纹尖端应力场 |
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| 引用本文： | 刘文庆,李强,张耀强,姜秉元.不同泊松比复合材料的裂纹尖端应力场[J].纤维复合材料,2002,19(1):14-15,22. |
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| 作者姓名： | 刘文庆 李强 张耀强 姜秉元 |
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| 作者单位： | 1. 上海大学材料所,200072
2. 洛阳工学院,471039 |
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| 摘 要： | 具有平面负泊松比的碳纤维/环氧树脂非平衡复合材料层板具有很高的断裂韧性和缺口断裂强度。本文用复变函数一变分方法计算了负泊比材料的裂纹尖端应力场，并与常规的平衡复合材料进行了比较。本文重点研究了主应力方向与纤维夹角的关系。结果表明：负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 复合材料 裂纹尖端应力场 负泊松比 裂纹 断裂强度 |
The Near-Tip Stress Fields for Crack in Composites with Different Poisson's Ratio |
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| Liu Wenqing,Li Qiang.The Near-Tip Stress Fields for Crack in Composites with Different Poisson''''s Ratio[J].Fiber Composites,2002,19(1):14-15,22. |
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| Authors: | Liu Wenqing Li Qiang |
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| Abstract: | It had been proved that Carbon/Epoxy unbalanced laminates with in-plane negative Poisson's ratio have higher fracture toughness and notch fracture strength.In this paper,the near-tip stress fields for crack in unbalanced laminates with in-plane negative Poisson's ratio were studied by the complex variable-variational method and were compared with that of balanced laminates.The relations between principal tress's orientations and fiber's orientations were focused in this paper.The calculation results showed that the unique near-tip stress fields for crack in these laminates with negative Poisson's ratio are in favor of enhancing the notch fracture strength. |
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| Keywords: | negative Poisson's ratio crack fracture strength stress field composites |
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