Constant strain rate constant stress (creep) Deformation tests ( constant T )

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Presentation transcript:

constant strain rate constant stress (creep) Deformation tests ( constant T )

Constant strain rate testing + Extensometer INSTRON (g.l. 10 mm, range 50 %) At our lab: Electromechanical (Instron 1123 or 5567) Universal Electromechanical Testing Machine Instron 5567 (dual column table top, 30 kN) Temperature Chamber Instron 3119 (-70 °C / 250 °C ) Servohydraulic Testing Machines (MTS 810)

Constant strain rate behaviour

... details at T = 573 K (Th > 0.6 ! For the Al-alloy) … why not constant loading-rate experiment?

Creep Testing: top-lever machine

PP P 10 mm initial stateafter creep Compression Test Compression Cage

Creep behaviour

The Monkman-Grant Relationship for time to fracture : time to fracture : minimum creep rate or, more general:where: 0.77<m<0.93; 0.48<B MG <1.3 for Al, Cu, Ti, Fe and Ni base alloys (from Monkman-Grant research) Test of Monkman-Grant for Cu

Engineering Estimates of Creep Behaviour Larson-Miller parameter (LM) ksi Fig a