| 三维广布裂纹疲劳扩展分析 |
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| 引用本文： | 任克亮,吕国志.三维广布裂纹疲劳扩展分析[J].航空学报,2009,30(3):462-467. |
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| 作者姓名： | 任克亮 吕国志 |
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| 作者单位： | 1. 宁夏大学物理与电气信息学院,宁夏银川,750021
2. 西北工业大学航空学院,陕西西安,710072 |
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| 基金项目： | 国家“973”基础研究前期研究专项(2008CB617613);;教育部科学技术研究重点项目(209136);;宁夏高等学校科学技术研究项目 |
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| 摘 要： | 飞机结构表面由于腐蚀、疲劳等原因存在三维广布裂纹，相邻裂纹在疲劳载荷作用下相互影响、相互促进，从而加速了结构破坏。为了探讨并求解三维广布裂纹结构的疲劳寿命，选取表面有两个半椭圆形表面裂纹的有限厚矩形板为计算模型，采用参数化有限元方法，求解裂纹前沿的应力强度因子、裂纹扩展方向和裂纹扩展增量，建立并应用应力强度因子变化历程，采用循环接循环损伤累积方法，对结构在疲劳载荷作用下的寿命进行了预测。预测结果为复杂环境中三维广布裂纹飞机结构的寿命评估提供了参考。
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| 关 键 词： | 飞机结构 广布裂纹 有限元方法 裂纹扩展 损伤累积 疲劳寿命 |
Fatigue Propagation Analysis of Three-dimensional Widespread Cracks |
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| Ran Keliang,Lu Guozhi.Fatigue Propagation Analysis of Three-dimensional Widespread Cracks[J].Acta Aeronautica et Astronautica Sinica,2009,30(3):462-467. |
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| Authors: | Ran Keliang Lu Guozhi |
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| Institution: | 1.School of Physics and Electrical Information Engineering;Ningxia Unversity;Yinchuan 750021;China;2.School of Aeronautics;Northwestern Polytechnical University;Xi'an 710072;China |
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| Abstract: | For three-dimensional widespread cracks caused by corrosion,fatigue,and other potential damages on the surface of an aircraft,the interaction which exists in adjacent cracks accelerates the damage of the structure under fatigue loading.In order to find a solution to the fatigue life of three-dimensional widespread cracks,a rectangular plate of finite thickness with two semi-elliptical surface cracks of different geometric dimensions in close vicinity is used as a model,and the parametric finite element meth... |
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| Keywords: | aircraft structure widespread cracks finite element method crack propagation damage accumulation fatigue life |
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