Acoustic emission monitoring of damage mechanisms an aramid-epoxy composite after tensile fatigue and aging seawater

Abstract

This paper helps to highlight the impact of tensile fatigue and hydric aging in sea water on a composite based the on aramid taffeta fibers and epoxy resin under acoustic monitoring. For this purpose, laminated test pieces were first stimulated to fatigue in several numbers of cycles
(cycles 100-50000) before being immersed in the second place for several times (100 to 1000 h) in sea water (37%). The acoustic monitoring was conducted by three piezoelectric sensors were placed on the surfaces of the specimens during static tests. It allowed us to detect directly the different types of damage caused by fatigue and aging (matrix cracking, delamination and fiber breakage). The results that highlight the effects of fatigue and aging, show that these two parameters reduce the fracture characteristics of the material based on the progressively increasing number of cycles and increase the durations of immersions.

DOI: http://dx.doi.org/10.5755/j01.mech.22.1.12176