Jung, Doyun Mizutani, Yoshihiro Todoroki, Akira Na, Wonjin 2024-01-19T14:30:44Z 2024-01-19T14:30:44Z 2021-10-21 2021-07 1229-9197 https://pubs.kist.re.kr/handle/201004/116809 We report the effect of exposure to up to 300 h of ultraviolet (UV) irradiation on the material properties and acoustic emission (AE) of glass fiber-reinforced composite specimens. The tensile strength decreased by up to 30 % due to photodegradation, which caused extensive matrix cracking and interfacial debonding. Although a global parameter of structural health (the b-value) tended to increase with increasing exposure to UV light, it decreased after 300 h of exposure. The AE signals were more highly attenuated in the irradiated specimens, and the contribution of low-amplitude AE signals to attenuation was greater. To demonstrate the effect of attenuation, a numerical study was carried out based on frequency-dependent attenuation rates calculated from the experimental results. Simulations clarified the influence of attenuation rate on the b-value of the degraded composite. English KOREAN FIBER SOC Effect of Ultraviolet Irradiation on the Material Properties and Acoustic Emission of a Fiber-reinforced Composite Article 10.1007/s12221-021-0423-1 1 FIBERS AND POLYMERS, v.22, no.7, pp.1940 - 1949 FIBERS AND POLYMERS 22 7 1940 1949 N scie scopus kci ART002739505 000644368900008 2-s2.0-85105340660 Materials Science, Textiles Polymer Science Materials Science Polymer Science Article ELECTRICAL-RESISTANCE THERMAL-DEGRADATION CONCRETE STRESS IDENTIFICATION ATTENUATION PROPAGATION MECHANISMS PREDICTION STRENGTH Acoustic emission b-value analysis Composite materials Environmental degradation Nondestructive testing