Isothermal and thermomechanical fatigue crack propagation in both virgin and thermally aged Haynes 230

Ewest, DanielLinköpings universitet,Mekanik och hållfasthetslära,Tekniska fakulteten,Siemens Ind Turbomachinery AB, Sweden (författare)

Funding Agencies|Siemens Industrial Turbomachinery AB, Finspang, Sweden
Fatigue crack propagation tests under both isothermal and non-isothermal thermomechanical fatigue conditions have been performed on wrought Haynes 230, a ductile combustor material. A number of specimens were thermally aged by pre-straining and subsequent furnace exposure for 3000 h at 600 degrees C. The tests were performed both under load and strain control, between room temperature and 600 degrees C. The thermally aged notched specimens show a decrease in the crack initiation life, similar to results previously reported for smooth test specimens at room temperature. For the crack growth rates, the effects of thermal ageing were less pronounced than for crack initiation. Further, the tests have been simulated using the finite element method to calculate the crack driving force, where the plasticity induced crack closure is handled with a full history description. A temperature dependent linear kinematic hardening plasticity law has been adopted for describing the material behaviour between room temperature and 600 degrees C. A post-processing tool was used in which the plasticity induced crack opening level was calculated, followed by a calculation of the effective Delta J range for each crack length. The adopted procedure yields good correlation between the different tests, under both isothermal and non-isothermal conditions.

TEKNIK OCH TEKNOLOGIER Maskinteknik Teknisk mekanik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Applied Mechanics hsv//eng
Fatigue testing; Nickel-based superalloy; Thermomechanical fatigue; Cyclic J-integral; Elasto-plastic fracture mechanics

Almroth, P.Siemens Ind Turbomachinery AB, Sweden (författare)
Sjodin, B.Siemens Ind Turbomachinery AB, Sweden (författare)
Leidermark, DanielLinköpings universitet,Mekanik och hållfasthetslära,Tekniska fakulteten(Swepub:liu)danle89 (författare)
Simonsson, KjellLinköpings universitet,Mekanik och hållfasthetslära,Tekniska fakulteten(Swepub:liu)kjesi56 (författare)
Linköpings universitetMekanik och hållfasthetslära (creator_code:org_t)

Ingår i:International Journal of Fatigue: ELSEVIER SCI LTD120, s. 96-1060142-11231879-3452

Av författaren/redakt...: Ewest, Daniel; Almroth, P.; Sjodin, B.; Leidermark, Dani ...; Simonsson, Kjell

Om ämnet

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Maskinteknik; och Teknisk mekanik

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