Abstract
The flexure strength of a polymethylmethacrylate (PMMA) plate is investigated. The plate resting on a ring foundation is subjected to either a quasi-static contact load or the impact load of a spherical projectile. The dynamic fracture load required to fracture the plate specimen is measured to be about 30% higher than the quasi-static fracture load. The piezoelectric accelerometer used to measure the impact load clearly detects the occurrence of fracture as a sudden drop in its signal output. General formulas for the contact between the spherical indenter and the thin plate specimen are obtained to determine the normal contact stress and the critical tensile stress in the plate.The speed of a crack propagating in a PMMA plate specimen under transverse loadings is measured experimentally. Since small in-plane stretching stress is produced in the specimen in the experimental arrangement, the crack speeds measured are small, compared to the limiting crack speed of the material.
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