Abstract
The purpose of the present study is to investigate the effect of specimen thickness on the fracture toughness of PMMA under impact loading. A dynamic finite-element method and a strain gage method are applied to measure the dynamic fracture toughness. Further, problems on determining the dynamic fracture toughness by the present technique are investigated. Consequently, the following conclusions were drawn : (1) The dynamic fracture toughness of PMMA becomes larger as the specimen thickness decreases from 15 mm to 5 mm. (2) The fracture toughness of PMMA increases rapidly as the loading rate increases in the range between 1. 3×104 (MPa√m/s) and 6. 7×104(MPa√m/s). (3) The measurement of the dynamic fracture toughness by the present method is limited to the higher range of loading rate.
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