In-phase and out-of-phase axial-torsional fatigue behavior of Haynes 188 at 760 C
Isothermal, in-phase and out-of-phase axial-torsional fatigue experiments have been conducted at 760 C on uniform gage section, thin-walled tubular specimens of a wrought cobalt-base superalloy, Haynes 188. Test-control and data acquisition were accomplished with a minicomputer. Fatigue lives of the in- and out-of-phase axial-torsional fatigue tests have been estimated with four different multiaxial fatigue life prediction models that were developed primarly for predicting axial-torsional fatigue lives at room temperature. The models investigated were: (1) the von Mises equivalent strain range; (2) the Modified Multiaxiality Factor Approach; (3) the Modified Smith-Watson-Topper Parameter; and (4) the critical shear plane method of Fatemi, Socie, and Kurath. In general, life predictions by the von Mises equivalent strain range model were within a factor of 2 for a majority of the tests and the predictions by the Modified Multiaxiality Factor Approach were within a factor of 2, while predictions of the Modified Smith-Watson-Topper Parameter and of the critical shear plane method of Fatemi, Socie, and Kurath were unconservative and conservative, respectively, by up to factors of 4. In some of the specimens tested under combined axial-torsional loading conditions, fatigue cracks initiated near extensometer indentations. Two design modifications have been proposed to the thin-walled tubular specimen to overcome this problem.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
- OSTI ID:
- 6840251
- Report Number(s):
- N-93-13153; NASA-TM--105765; E--7182; NAS--1.15:105765; AVSCOM-TR--91-C-046; CONF-911048--; CNN: DA PROJ. 1L1-61102-AH-45; RTOP 553-13-00
- Country of Publication:
- United States
- Language:
- English
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Elevated temperature axial and torsional fatigue behavior of Haynes 188
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALLOY-CO36CR22NI22W15FE3
ALLOYS
CHROMIUM ALLOYS
COBALT ALLOYS
COBALT BASE ALLOYS
CORROSION RESISTANT ALLOYS
CRACKS
FATIGUE
HAYNES 188 ALLOY
HAYNES ALLOYS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
LANTHANUM ADDITIONS
LANTHANUM ALLOYS
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
RARE EARTH
RARE EARTH ALLOYS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
THERMAL FATIGUE
TORSION
TUBES