24 July 2001 Hybrid transient-parametric AE analysis of histories of damage micromechanisms in composites
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The problem of microdamage evolution in advanced composites is addressed in this paper. A combination of transient waveform classification and multiparametric filtering is used to extract the histories of damage evolution in a unidirectional graphite/epoxy composite loaded in the fiber and transverse directions. Three characteristic AE waveforms with different amplitudes, durations, and frequency spectra are identified based on the transient analysis. The waveforms are associated with matrix cracks, fiber breaks, and longitudinal splitting in the composite. Parametric regions for the characteristic waveforms are identified in the amplitude-risetime parametric space. Multiparametric filtering is applied to extract the microdamage evolution histories. The method is expected to be advantageous for the real-time damage and fracture monitoring of composite structures.
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Yuris A. Dzenis, Yuris A. Dzenis, Jie Qian, Jie Qian, } "Hybrid transient-parametric AE analysis of histories of damage micromechanisms in composites", Proc. SPIE 4335, Advanced Nondestructive Evaluation for Structural and Biological Health Monitoring, (24 July 2001); doi: 10.1117/12.434192; https://doi.org/10.1117/12.434192

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