Abstract
This paper discusses the possibilities of improving of fatigue strength through changing the characteristics of the surface layer (skin layer) of SMC and CFRP laminated materials by ultraviolet (UV) ray irradiation under specific conditions. The experiment for surface improvement by UV ray irradiation was performed using an ultra-high-pressure ozoneless mercury lamp. For the UV ray source, a primary wavelength of 365 nm in the long-wavelength region was selected. The surface of the specimen was irradiated by a direct irradiation optical unit. The environmental fatigue tests were performed using the 4-point bending method by an electrohydraulic servo-type material testing machine. As a result, under specific UV ray irradiating conditions (wavelength, irradiation intensity and the integrated luminous energy of irradiation), UV irradiation on the surface of SMC and CFRP laminated materials was found to contribute to the retardation of water absorption and the improvement of the fatigue life.
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