TITLE

Correlation between dynamic nonlinearity and static mechanical properties of corroded E-glass reinforced polyester composites

AUTHOR(S)
Van Den Abeele, K.; Van de Velde, K.
PUB. DATE
May 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1359
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Glass-fiber reinforced plastics degrade in different manners when exposed to chemical environments. Migration of chemicals into the matrix results in absorption, chemical reaction, plastization, and dissolution of the matrix. Furthermore, the chemicals cause degradation of the glass fiber itself and debonding between the glass fibers and the matrix material takes place. In this work, we investigate the chemical resistance of pultruded polyester composites as a function of exposure time, and compare the observations from static mechanical tests with the results from nonlinear dynamic vibration experiments for various exposure fluids. The mechanical properties were measured according to ASTM standards, both in flexural and tensile tests. The nonlinear properties were measured using a new nondestructive testing technique called Single Mode Nonlinear Resonance Acoustic Spectroscopy (SIMONRAS). This method focuses on the strain dependence of the resonance frequency while driving a sample at relatively low amplitudes. The obtained relative frequency shift is a measure of the internal microstructural properties of the material. The correlation between this nonlinearity parameter and the mechanical properties as a function of exposure time is extremely good, which implies that the SIMONRAS technique can be used to predict the mechanical degradation of composites due to corrosion in a nondestructive manner. © 2000 American Institute of Physics.
ACCESSION #
6029250

 

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