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Damage detection and fatigue life estimation under random loads: A new structural health monitoring methodology in the frequency domain
Fatigue & Fracture of Engineering Materials & Structures ( IF 3.7 ) Pub Date : 2021-02-25 , DOI: 10.1111/ffe.13439
Denys E. T. Marques 1, 2 , Dirk Vandepitte 2 , Volnei Tita 1
Affiliation  

This paper presents a methodology for structural health monitoring of fatigue cracks under stationary random loads. The methodology is composed of two parts: an empirical correlation to monitor the evolution of damage indices and a numerical scheme for fatigue life estimation. The damage indices are based on the variation of the vibrational response of the structure due to crack propagation. Two damage metrics are studied, and the methodology is verified for a cantilever beam subjected to random base excitation. The case study validates the effectiveness of the methodology and shows that both metrics have the potential for damage detection. For the numerical estimation of the fatigue life, the proposed framework uses the probability density function of the stress, which is obtained from frequency‐domain methods, and an equivalent stress approach based on the Walker's equation for fatigue crack growth. Excellent agreement is found between the predicted fatigue life and the experimental values.

中文翻译:

随机载荷下的损伤检测和疲劳寿命估算:一种新的频域结构健康监测方法

本文提出了一种在固定随机载荷下对疲劳裂纹进行结构健康监测的方法。该方法由两部分组成:用于监测损伤指数演变的经验相关性和用于疲劳寿命估算的数值方案。损伤指数基于裂纹扩展引起的结构振动响应的变化。研究了两个损伤度量,并验证了随机悬臂梁受到随机基础激励的方法。案例研究验证了该方法的有效性,并表明这两个指标都具有检测损坏的潜力。对于疲劳寿命的数值估计,所提出的框架使用了应力的概率密度函数,该函数是从频域方法获得的,基于沃克方程的疲劳裂纹扩展等效应力方法。在预测的疲劳寿命和实验值之间找到了极好的一致性。
更新日期:2021-04-28
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