| 考虑裂纹表面摩擦阻尼的振动疲劳裂纹扩展分析 |
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| 引用本文： | 刘文光,陈国平.考虑裂纹表面摩擦阻尼的振动疲劳裂纹扩展分析[J].振动与冲击,2012,31(5):42-45,72. |
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| 作者姓名： | 刘文光 陈国平 |
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| 作者单位： | 1.南京航空航天大学飞行器结构力学与控制教育部重点实验室，南京，210016;2.南昌航空大学航空制造工程学院，南昌，330036 |
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| 基金项目： | 863国家高技术研究发展计划(2008AA12A205);南京航空航天大学基本科研业务费专项科研项目(NS2010006);南昌航空大学校基金(EC200906236) |
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| 摘 要： | 以含表面裂纹悬臂梁为研究对象，研究了裂纹面摩擦效应对裂纹疲劳扩展的影响。分析时，用双线性弹簧描述裂纹呼吸行为，用Galerkin方法把呼吸裂纹梁简化为单自由度系统，基于Coulomb摩擦模型和能量耗散理论推导了摩擦阻尼损耗因子，运用广义的Forman方程模拟疲劳裂纹扩展，通过振动分析与裂纹扩展计算同步进行的方法考虑振动与疲劳的耦合效应，探讨了摩擦阻尼对裂纹梁疲劳裂纹扩展寿命的影响。结论表明，摩擦阻尼损耗因子随裂纹扩展呈单调递增趋势，摩擦阻尼对振动疲劳裂纹扩展的影响不容忽视
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| 关 键 词： | 振动疲劳 裂纹扩展 摩擦 阻尼 |
| 收稿时间： | 2010-11-4 |
| 修稿时间： | 2010-12-17 |
Vibration fatigue crack growth considering crack surface friction damping |
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| LIU Wen-guang,CHEN Guo-ping.Vibration fatigue crack growth considering crack surface friction damping[J].Journal of Vibration and Shock,2012,31(5):42-45,72. |
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| Authors: | LIU Wen-guang CHEN Guo-ping |
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| Affiliation: | (1. MOE Key Lab of Structure Mechanics and Control for Aircraft, Nanjing University of Aeronautics &Astronautics, Nanjing, 210016)(2. School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang, 330063 |
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| Abstract: | A cracked cantilever beam was taken as the study object and influence of crack surface friction effect on fatigue crack growth was studied.In analysis,breathing behavior of crack was depicted with bilinear spring,a breathing cracked beam was simplified into a single-degree-of-freedom system via Galerkin method,damping loss factor was derived based on Coulomb friction model and theory of energy dissipation,fatigue crack propagation was simulated with Forman equation,and coupling effect of vibration and fatigue was considered with vibration analysis and crack propagation calculation simultaneously.The influence of friction damping on the fatigue crack propagation life of the cracked beam was discussed.Results indicated that friction damping monotonely increases along with crack growth and the influence of friction damping on vibration fatigue crack propagation cannot be ignored. |
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| Keywords: | vibration fatigue crack propagation friction damping |
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