Abstract
The failure behavior of composites under ultraviolet (UV) irradiation was investigated by acoustic emission (AE) testing and Ib-value analysis. AE signals were acquired from woven glass fiber/epoxy specimens tested under tensile load. Cracks initiated earlier in UV-irradiated specimens, with a higher crack growth rate in comparison to the pristine specimen. In the UV-degraded specimen, a serrated fracture surface appeared due to surface hardening and damaged interfaces. All specimens displayed a linearly decreasing trend in Ib-values with an increasing irradiation time, reaching the same value at final failure even when the starting values were different.
Highlights
We investigated changes in the mechanical properties of a woven glass fiber-reinforced plastics (GFRPs) after exposure We investigated changes in the mechanical properties of a woven GFRP after expoto UV radiation
We mainly focused on changes in acoustic emission (AE) parameters, including Ib-values
We mainly focused on changes in AE parameters, including Ib-valUV radiation affected fracture stress and strain differently
Summary
Amplitude is related to crack size, while hits are related to crack growth This technology has been used for structural health monitoring (SHM), especially in the context of seismology [22,23], and construction (i.e., concrete structures [24,25,26]). Introduced the b-value, derived from the amplitude–cumulative hits distribution, to evaluate the state of a crack (earthquake). [28], itimproved the b-value by using both by using isboth the mean and variance, andetapplied to the analysis of cracks in rocks. UV irradiation conditions and studied the damage initiation and accumulation tion and accumulation behavior using b-value analysis. In theGFRP tensile test, the AE hitsprepared and amplitude distribution were used to analyze crack. Establishes a technique for analyzing the extent of degradation via AE testing
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