Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 07, 2017 - October 09, 2017
Robots and apparatuses used as welfare equipment are conventionally made of metal as a structural material. In recent year, a light structure material for mobile equipment is required for improvement of physical support or help. Therefore, composite material for these uses is expected to satisfy high strength, high rigidity, and low density. In this study, Sirasu Balloons (SB), the micro glassy hollow spherical materials with improved interface bond strength, are used for reinforced composites. The matrix was epoxy resin. Its surface treatment was done by using silane coupling agent treatment, because the weak interfacial debonding between SB and a matrix was observed in recent work. The hybrid composite was designed by using reinforcing carbon fibers with core composite materials. Izod impact test was performed for cylindrical specimen of the composites. The impact properties were examined from the experimental results. By using scanning electron microscope (SEM), the observations for the interfacial debonding were performed from the viewpoint of micro-mechanical study. Consequently, the Izod impact strength of the composite was about ten times larger that of the core composite alone. In addition, silane coupling treatment improved the interfacial debonding because destroyed SB was observed from SEM photo for fracture surface. By controlling the interfacial strength, the crack growth resistance was increased.
