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EFFECTS OF SPEED AND TEMPERATURE ON CRACK TOUGHNESS AND YIELD STRENGTH IN MILD STEEL
NAVAL RESEARCH LAB WASHINGTON D C
OF THE CONTINUOUSLY DECREASING LOCAL STRESS RATES IN ADVANCE OF A RAPIDLY LOADED OR OF A MOVING CRACK AND AT LOW TEMPERATURE, ELASTIC BOUNDARY APPEARS TO BE CRITICAL. The upper yield strength determined for such stress rate, taken to the negative 1.5 power, is proportional to the plane strain fracture toughness over an indefinitely large range of speed and temperature. Estimates thus become possible at temperatures so high that fracture toughness would be too large to be evaluated by specimens of reasonable size. Using such estimates, the Charpy notch bar transition for three steels is predicted with good agreement. Further, the effects of crack propagation velocity can be given interpretation quite consistent with observations. Author
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