Coupling Analysis of Vibration Fatigue Crack Growth for Breathing Cracked Beam

Abstract

Abstract:

A method for coupling analysis of vibration fatigue crack propagation was proposed to improve the analysis precision of fatigue crack growth for breathing cracked beams. Double linear spring was used to depict breathing crack and the modified Forman equation was employed to simulate crack propagation. And cracked beam was simplied to single degree of freedom system through Galerkin method and the coupling relation between vibration and fatigue crack growth was considered through vibration analysis instead of crack propagation estimation cycle by cycle. Results indicate that breathing crack can depict the vibration course and the phenomenon of fatigue crack growth objectively, excitation frequency and damping has important influence on the fatigue life, especially obvious on resonance fatigue.

Key words:

vibration fatigue, breathing crack, crack propagation, coupling analysis

摘要：

为提高结构振动疲劳分析的精度，提出一种呼吸式裂纹梁的振动疲劳裂纹扩展耦合分析方法。分析过程中，采用双线性弹簧描述呼吸式裂纹，广义的Forman方程模拟疲劳裂纹扩展;运用Galerkin法把裂纹梁简化为单自由度系统，振动分析与疲劳裂纹扩展计算交替进行，并考虑了振动疲劳裂纹扩展耦合行为。结果表明，对于含裂纹结构的振动疲劳裂纹扩展，采用呼吸式裂纹可以更客观地描述振动过程和裂纹扩展现象;激励频率和阻尼效应对疲劳寿命具有重要影响，尤其对共振疲劳裂纹扩展而言，阻尼效应特别明显。

关键词:

振动疲劳, 呼吸式裂纹, 裂纹扩展, 耦合分析

CLC Number:

V216.3
V224

LIU Wen-Guang, CHEN Guo-Beng.

Coupling Analysis of Vibration Fatigue Crack Growth for Breathing Cracked Beam

[J]. China Mechanical Engineering, 2010, 21(23): 2798-2802.

刘文光, 陈国平.

呼吸式裂纹梁的振动疲劳裂纹扩展耦合分析

[J]. 中国机械工程, 2010, 21(23): 2798-2802.

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