9-Elevated Temp & Fracture

Formation of voids occur particularly at grain

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Unformatted text preview: to the strain at fracture. Formation of voids occur particularly at grain boundaries. Necking occurs. CREEP TESTS Predicts long time creep behavior. Determines maximum allowable creep elongation for design. (usually 10-5 % / hr at temperature) Plot log stress vs. log minimum creep rate. CREEP RUPTURE TESTS: Predict time to rupture at end of last stage of creep. Higher loads than creep test and carried out to failure. Plot log stress vs. log rupture life. Tensile Testing Machine Tensile Fracture Behavior Fracture Surface Micromorphology Ductile Microvoid Coalescence Brittle Cleavage Fracture Charpy Impact Testing to Determine Impact Resistance Fracture Energy Absorbed as a Function of Temperature in Different Metals Charpy Energy as a Function of Temperature for Steels of Different Carbon Content Linear Elastic Fracture Mechanics (LEFM) Fracture Toughness Sample K c = Yσ a when conducted so as to yield the lowest value of K then Kc = K IC = Yσ a = material constant Low-Stress-Leve...
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