Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 08, 2016 - October 10, 2016
The purpose of this study is to research influence of mass of impactor on impact strength of an acrylic resin plate. Impact bending specimens were made of the resin plate thickness of 5mm. Different mass impactors were prepared. Two type three-point bending devices were used for this study. One type is for low mass impactors. This device shoots the impactors by compressed air. Another type is for high mass impactors. In this device, the impactor falls down through an acrylic resin tube. The minimum velocities required for fracture of the specimens were measured by a velocity sensor attached in devices. From the velocities and the mass of impactor, kinetic energies were calculated. From the experiments, rate dependence of the kinetic energy required for breaking the specimen was confirmed. In the low-mass range, the kinetic energy increased with the increase in the mass of impactor. On the other hand, in the high- mass range, the kinetic energy decreased with the increase in the mass. This boundary mass was 100g. In the low mass range, this phenomenon may be due to loading rate dependence in mechanical properties of this material. When the loading rate is high, the acrylic resin shows the brittle property. In the high mass range, the velocity of the impactor is low and the kinetic energy decreases by the mass effect of the impactor.
