Study on residual strength of short fiber composite material due to sphere impact

Abstract

In this study, a small sphere impact test was carried out using a short fiber reinforced composite material to investigate damage due to impact. After the impact test, the bending test was carried out and the residual strength was investigated. As the results, when the impact speed of the sphere is low, only indentations are formed on the surface of the specimen. It was found that radial cracks occurred in addition to indentations as the impact speed of the sphere increased. As a result of the four point bending test, the residual strength tended to decrease as the impact speed increased. It was found that the fracture position can be classified into three types: (a) rupture at a position irrelevant to the indentation, (b) rupture along the edge of the indentation, (c) rupture across the indentation.