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- W2051497997 abstract "Many damage detection methods that are applied to composite structures rely on nonlinear features in the dynamic response of the structure to identify the presence of defects. Presently, there is not a complete understanding of the physical mechanisms that cause the nonlinear behavior of a damaged composite structure. Correlating specific types of damage mechanisms to the resulting nonlinear response characteristics they cause would allow the detection methods to classify the type of damage that is present in the structure. In this work, a drop tower was used to impact an aluminum honeycomb sandwich panel in order to induce core-crushing. The response of the damaged panel to sinusoidal excitations of various amplitudes at resonant, super-, and sub-harmonic frequencies was then measured. The amplitudes of these measured responses and the corresponding restoring force curves were then compared to a predictive model to identify the type of theoretical nonlinearity (i.e. quadratic or cubic stiffness, quadratic or cubic damping, etc.) that was present. The predictive model is based on a nonlinear, single degree-of-freedom system. Nonlinear features in the response of the system were identified for different types of stiffness and damping nonlinearities. The experimentally measured response was analyzed to see which of these features were present. Based on this analysis, the response of the panel of damage due to core-crushing indicated a quadratic spring-type stiffness." @default.
- W2051497997 created "2016-06-24" @default.
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- W2051497997 date "2014-08-17" @default.
- W2051497997 modified "2023-09-26" @default.
- W2051497997 title "Identification of Nonlinear Behavior in a Composite Structure With Core-Crushing Damage" @default.
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- W2051497997 doi "https://doi.org/10.1115/detc2014-34409" @default.
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