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Updated: Jun 26, 2026

A Testing Platform for Durability Studies of Polymers and Fiber-reinforced Polymer Composites under Concurrent Hygrothermo-mechanical Stimuli
Published on: December 11, 2014
Monitoring progressive damage in polymer-based composite using nonlinear dynamics and acoustic emission
Mourad Bentahar1, Rachid El Guerjouma
1Laboratoire d'Acoustique de l'Universite du Maine, UMR CNRS, Universite du Maine, Le Mans Cedex 9, France. mourad.bentahar@univ-lemans.fr
Abstract:
In this work quantitative results of applying nonlinear acoustic dynamics to study progressive damage in a polymer-based composite SMC (sheet molding compound) are presented. Via carefully controlled resonant plate experiment, nonlinear slow dynamics (SNLD) response of SMC in terms of relaxation time and frequency shift has been shown to be very sensitive to gradual damage induced using three-point bending tests. Besides, acoustic emission monitoring is used to characterize damage through the elastic energy released by SMC at every damage step. Interesting logarithmlike changes of the SNLD parameters as a function of the acoustic emission cumulated energy are found.
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