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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
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
Kc = K IC = Yσ a = material constant Low-Stress-Leve...
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- Fall '13