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An impact three-point bend testing apparatus was developed using the split Hopkinson bar technique. The apparatus was used to measure the dynamic fracture toughness of an acrylic polymer (PMMA) at an ...impact loading rate (9m/s). A silicone rubber sheet 10 mm thick was placed between the striker and the input bars to produce a gentle stress pulse in the input bar and as a result, the time to fracture of the specimen could be extended. A dynamic finite element analysis of the specimen showed that a quasi-static stress state was achieved in the crack tip region of the specimen, and it was therefore assumed that the static formula could be applied to the estimation of the dynamic fracture toughness. The dynamic toughness evaluated was then compared with the static toughness obtained from a quasi-static bending test.続きを見る
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