衝撃破壊靱性の特性

概要

論文の詳細を見る
Impact fracture experiments were performed using three CT-type specimens made of PMMA with the size ratio 1 : 2 : 3 for an analogous geometry with each other. A precrack was introduced artificially in each specimen, which was impacted by a wedge bar. The impact bar was accerelated by a gas gun to impose an impact force to the wedge bar, and the fracture behavior was measured with a strain gage pasted at the crack tip of each specimen. Based on the diagram of dynamic strain history, the impact fracture toughness K_<I,IC> was evaluated. The results showed that the K_<I,IC> value of a small specimen was lower than that of a large one, and K_<I,IC> values decreased with increased of impact velocity. When a specimen was partially supported, the K_<I,IC> value increased, except for the S-size specimen. At low temperatures K_<I,IC> values increased for both size specimens. A parabola pattern was observed more densely on the fracture surface of large specimens.
一般社団法人日本機械学会の論文
1993-04-25