Acoustic emission characterization of failure modes on single and double lap joints of FRP under tensile loading

Abstract

In aerospace and automobile applications, various composite parts are required to be joined together using either adhesives or mechanical fasteners One of the aims of this research work is to discriminate the failure modes on lap joints of glass fiber reinforced plastic GFRP and basalt fiber reinforced plastic BFRP laminates and the role of composite structural design in the joint strength To design structural components a deep understanding about material behavior and its failure mechanisms is necessary Characterization of failure modes in the case of composite lap joints is a complex research subject Hence, the present study is focused on acoustic emission AE characterization of failure modes in three prominent joining methods namely bonded riveted and hybrid joints newlineThe aim of this research work is to identify the associated failure modes during tensile tests of composite lap joints using AE signals The AE data acquired during the tensile test has been analyzed using different techniques viz parametric studies failure discrimination based on the AE parameters fast Fourier transform FFT individual peak frequency content of each failure modes continuous wavelet transform CWT time information and frequency range for failure modes finite element analysis FEA Von Mises stress distribution and scanning electron microscope SEM possible failure modes using microscopic observation of fractured surface newline newline