動的三点曲げ試験によるアクリル樹脂発泡フィルムの荷重緩和の評価

抄録

In this research, impact reduction effect of acrylic foam film was clarified by using dynamic three-point bending testing machine. The specimens were an aluminum alloy (JIS A6063) beams with an acrylic foam films on surfaces of the beams. The acrylic foam film had thickness of 700 μm and density of 0.5 mg/mm³ on a polyethylene terephthalate substrate film with a thickness of 38 μm. The aluminum alloy beam had thickness of 3, 6 and 10 mm. The input and output bars in the three-point bending testing machine were made of aluminum alloy (JIS A7075-T6). The bars were 2 m in length and 12 mm in diameter. The striker made of polycarbonate was 200 mm in length and 12 mm in diameter. Impact load was applied to the input bar by colliding the striker. Impact load and reaction load were calculated from strain histories of the input and output bars due to one-dimensional elasto-dynamic theory. Histories of the impact loads for the specimens with the acrylic foam film were lower than the one for the specimens without the acrylic foam film. The maximum impact loads for the specimens 10 mm in thickness with the acrylic foam film was 20% smaller than the one for the specimens without the film. The acrylic foam films were found to be effective to the impact load reduction for higher stiffness of a structure.