| 正交复合材料Ⅰ型裂纹动态响应焦散线实验研究 |
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| 引用本文： | 许蔚,徐曼琼,姚学锋,李煊,蒋元兴.正交复合材料Ⅰ型裂纹动态响应焦散线实验研究[J].工程力学,2006,23(3):173-176,155. |
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| 作者姓名： | 许蔚 徐曼琼 姚学锋 李煊 蒋元兴 |
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| 作者单位： | [1]清华大学工程力学系,北京100084 [2]中国航天科技集团航天材料及工艺研究所,北京100076 |
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| 基金项目： | 国家自然科学基金研究项目（19902008） |
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| 摘 要： | 利用高速摄影技术与光学焦散线技术相结合，对冲击下正交复合材料Ⅰ型裂纹尖端的动态应力集中问题进行了光测力学实验研究。记录了两种层状碳纤维／环氧树脂复合材料在冲击作用下Ⅰ型裂纹尖端的动态焦散斑图，提取反映材料局部应力集中问题的力学参数：焦散斑特征尺寸，进而比较两种复合材料的抗冲击性能。这些研究工作对于复合材料冲击性能评估具有工程应用价值和科学研究意义。
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| 关 键 词： | 正交复合材料 应力强度因子 焦散线 Ⅰ型裂纹 动态响应 |
| 文章编号： | 1000-4750（2006）03-0173-04 |
| 收稿时间： | 2004-04-14 |
| 修稿时间： | 2004-04-142004-06-28 |
EXPERIMENTAL STUDY OF CAUSTICS OF MODE-I DYNAMIC CRACK RESPONSE IN ORTHOTROPIC COMPOSITES |
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| XU Wei , XU Man-qiong , YAO Xue-feng , LI Xuan , JIANG Yuan-xing.EXPERIMENTAL STUDY OF CAUSTICS OF MODE-I DYNAMIC CRACK RESPONSE IN ORTHOTROPIC COMPOSITES[J].Engineering Mechanics,2006,23(3):173-176,155. |
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| Authors: | XU Wei XU Man-qiong YAO Xue-feng LI Xuan JIANG Yuan-xing |
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| Affiliation: | 1.Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China; 2. 701 institute, Beijing 100076, China |
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| Abstract: | High-speed Schardin photography and optical caustics method are introduced to study dynamic stress singularities of mode-I crack tip in orthotropic composites trader impact. A series of dynamic caustic patterns stranding the crack tip of two kinds of laminated carbon fiber/epoxy resins composites under impact were recorded. Variations of the caustic shape diameter due to the local stress singularity at the crack tip were examined. The characteristic size of caustics that is related to the mechanical parameter of local stress concentration was measured. The impact behaviors of two kinds of composites were compared. These results can help to evaluate strength and predict service life for composite structures. |
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