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Thermoelasticity-based modal damage identification
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DOI：10.1016/j.ijfatigue.2020.105661.png)
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Abstract
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The response of linear dynamic structures can be decomposed into modal components, where each natural frequency is also represented by a corresponding mode shape and damping ratio. While vibration-fatigue-damage identification was recently expanded using modal decomposition, this research proposes a modal-decomposition-based thermoelastic damage identification method. With the proposed method, a thermal camera can be used to identify the damage intensity of a particular mode shape. The proposed method is presented using a randomly excited structure exposed to multiaxial loads. With this, the intensity of a particular fatigue source is clearly related to the underlying structural dynamics.
Keywords:
Thermoelasticity
Fatigue damage
Modal decomposition
Frequency-domain
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