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Abstract
Damage growth monitoring plays an important role in providing early warning of structural failure. The existing methods for damage growth monitoring are mainly local inspection methods, such as acoustic emission. These methods need a priori knowledge of accessible damage vicinity, which may not be realized in practice. Hence, vibration-based global approach is adopted to overcome these difficulties. Natural frequency, as a global modal parameter, can be measured easily and is used for vibration-based damage growth monitoring in this study. A concept of damage-induced relative natural frequency change (RNFC) curve is defined first and its relation with mode shape is then derived analytically, giving a good way to approximate RNFC curves. For monitoring damage growth, a damage growth indicator is proposed based on RNFCs between two damaged stages of a beam. The effectiveness of the indicator for damage growth monitoring is proved by both numerical and experimental cases in beam-like structures.
Highlights
Structural health monitoring (SHM) is a promising research field for maintaining structural health
SHM methods mainly focus on damage diagnosis including damage localization and severity evaluation [1, 2]
Less attention has been paid to damage growth monitoring, which plays an important role in providing early warning of structural failure
Summary
Structural health monitoring (SHM) is a promising research field for maintaining structural health. Chen et al [6] used acoustography for real-time monitoring of fatigue damage growth in composites. Kumar et al [7] used rotating frequency changes as an indicator to monitor damage growth in turbine blades. It is seen that the existing methods for damage growth monitoring are mainly local inspection methods. Such methods need a priori knowledge of accessible damage vicinity, which is not practical in many applications. A simple indicator based on relative natural frequency changes (RNFCs) is formulated for damage growth monitoring from any reference state to the current state in beam-like structures. VIBRATION-BASED DAMAGE GROWTH MONITORING IN BEAM-LIKE STRUCTURES.
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