NDLI: Investigation of Damage in Composites Using Nondestructive Nonlinear Acoustic Spectroscopy

Content Provider	Springer Nature Link
Author	Eckel, S. Meraghni, F. Pomarède, P. Declercq, N. F.
Copyright Year	2016
Abstract	The presented experimental work describes the nondestructive damage examination of polymer-matrix composites using acoustic methods under the consideration of nonlinear effects. The aim is to analyze these nonlinear effects in order to provide a quantification of the nonlinear acoustic transmission which is related to the damage state and its severity in the composite material. The first objective was to study the effectiveness of the distortion evaluation method and its related parameter: the “Total Difference Frequency Distortion” (TDFD) parameter. The TDFD was utilized as a new damage indicator to quantify the progressive damage state in composite materials. The TDFD method had initially been proposed to characterize the distortion of audio amplifiers. A custom-made setup was developed that imposes acoustic signals to the structure. The samples’ vibrations were afterwards analyzed by a laser vibrometer and further spectrum evaluations. The developed method was applied to two composite materials, both reinforced with taffeta woven glass-fibers, but having different thermoset polymer matrix, i.e. vinylester and epoxy. The damage was introduced in the specimen by tensile tests with a stepwise increase of the tension loading. It was observed that damage influences the intensity of nonlinear intermodulation after having introduced two harmonic and constant signals of different and randomly chosen frequencies in the specimen. The nonlinear intermodulation was then quantified by computing the TDFD parameter. In the specific case of epoxy based composites, high frequency peaks were noted for the high tensile loading levels only. The TDFD parameter was then modified in order to take into account this effect. For both studied composites, the modified TDFD parameter increases with the damage accumulation caused by the applied stepwise tensile loading.
Starting Page	207
Ending Page	217
Page Count	11
File Format	PDF
ISSN	00144851
Journal	Experimental Mechanics
Volume Number	57
Issue Number	2
e-ISSN	17412765
Language	English
Publisher	Springer US
Publisher Date	2016-10-14
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer-matrix composites Damage detection Nondestructive testing Nonlinear acoustics Intermodulation Continuum Mechanics and Mechanics of Materials Characterization and Evaluation of Materials Optics, Lasers, Photonics, Optical Devices Structural Mechanics Vibration, Dynamical Systems, Control Classical Mechanics
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Mechanical Engineering Aerospace Engineering

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