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The effect of loading rate on the production of rapid crack propagation (RCP) was investigated in tensile loaded notched specimens 127 mm long taken from a gas pipe. It was found that the stress intensity to initiate fracture was independent of loading rate, but was slightly greater at 10°C than at 28°C. The initiation of rapid fracture occurred at a critical loading rate and rapid long range fracture (RCP) occurred at a 50% higher loading rate. It was not possible to produce RCP at 28°C with the available equipment. The input energy to initiate rapid fracture was about 10 times the input energy to produce RCP, long range rapid fracture.
Rapid fracture, gas pipes, loading rate, KIC, notched specimen, crack propagation
Professor in Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA
Senior Scientist in Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA