| 计及基体刚度的单向复合材料应力集中分析 |
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| 引用本文： | 曾庆敦,王志力,凌玲.计及基体刚度的单向复合材料应力集中分析[J].华南理工大学学报(自然科学版),1996(9). |
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| 作者姓名： | 曾庆敦 王志力 凌玲 |
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| 作者单位： | 华南理工大学交通学院 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 提出了一种计及基体拉伸刚度效应的修正剪滞模型，用于研究单向纤维增强复合材料中由于纤维或基体破坏所引起的应力重分布问题。文中定量讨论了纤维／基体拉伸刚度比及纤维体积分数对断口邻近的纤维和基体的应力集中的影响。证实了当基体拉伸模量较低（如树脂基复合材料）及纤维体积分数较大时，可以忽略基体刚度对应力集中的影响；而对于其它情形（如陶瓷、金属基复合材料），就不可忽略基体刚度的影响。
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| 关 键 词： | 复合材料 应力集中 界面剪力 ／剪滞分析 |
ANALYSIS OF STRESS CONCENTRATIONS OF UNIDIRECTIONAL COMPOSITES CONSIDERING THE MATRIX STIFFNESS |
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| Zeng Qingdun,Wang Zhili,Ling Ling.ANALYSIS OF STRESS CONCENTRATIONS OF UNIDIRECTIONAL COMPOSITES CONSIDERING THE MATRIX STIFFNESS[J].Journal of South China University of Technology(Natural Science Edition),1996(9). |
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| Authors: | Zeng Qingdun Wang Zhili Ling Ling |
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| Abstract: | This paper proposes a modified shear lag model accounting for the effect of the tensile stiffness of the matrix, which can be used for studying the stress redistribution due to the failure of fibers or matrix of unidirectionally fiber reinforced composites, discusses quantitatively the influence of the stiffness ratio of matrix to fiber and of the fiber volume fraction on the stress concetrations in the fibers and matrix adjacent to the fracture and proves that the influence of the tensile stiffness of the matrix on the stress concentration can be neglected when the matrix stiffness is low (such as polymer matrix composites) and the volume fraction of fibers is high. For the other cases, such as ceramic and metal matrix composites, the tensile stiffness of the matrix can not be neglected in the shear lag analysis. |
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| Keywords: | composite material stress concentration interface shear stress /shear lag analysis |
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