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。
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.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第5期42-45,72,共5页
Journal of Vibration and Shock
基金
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)
关键词
振动疲劳
裂纹扩展
摩擦
阻尼
vibration fatigue
crack propagation
friction
damping
