アクリル樹脂板の衝撃強度に関する基礎的研究

抄録

The impact strength of acrylic resin board has been evaluated by three- point bending impact test in our laboratory,. The relationship between the minimum kinetic energy required for breaking the acrylic resin plate specimen and the mass of the impactor was researched. As a result, with low mass impactor, the kinetic energy increased with increasing mass. On the other hand, with high mass impactor, the kinetic energy decreased with increasing mass. The purpose of this study is to clarify the reason why the kinetic energy decreases as the mass increases in the experiments using high mass impactors.In the impact three-point bending test by the high-mass impactor, the impact load was given by free fall of the impactor. It is predicted that the load method of impact load is the cause. Therefore, the experiment was conducted with the impact load direction in the horizontal direction, and compared with the result obtained by the free fall loading experiment. As a result, when the impact load was applied in the horizontal direction, the kinetic energy of the impactor showed a substantially constant value regardless of the impactor mass. The bending stresses in each loading method were evaluated. For the horizontal load, the stresses were calculated by the kinetic energy of the impactor. On the other hand, at the free falli load, the bending stresses were calculated considering the kinetic energy of the impactor and the mass of the impactor. Both bending stresses were almost equal. Therefore, as the mass of the impactor increases, the static stress due to the mass increases, so it is considered that the kinetic energy required for breaking of the specimen decreases.