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The effect of mean stresses on short fatigue crack growth behaviour.

Wang, Chun Hui (1991) The effect of mean stresses on short fatigue crack growth behaviour. PhD thesis, University of Sheffield.

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Abstract

This thesis investigates the effects of mean stresses on the fatigue behaviour of short cracks and related mechanisms. An experimental programme was carried out to investigate the effect of mean stresses on short fatigue crack growth behaviour and fatigue life in air. The material used was a 1.99% NiCrMo steel. Specimens with a shallow hour-glass profile were tested under torsional and uniaxial loading with various alternating and mean stress levels. Crack propagation was monitored by means of a surface replication technique applied periodically during the tests. Several results have been obtained. Satisfactory predictions of the MSC growth rate and high cycle fatigue lifetime data from the following four types of tests have been achieved on the basis of this model: (a) fully reversed torsion tests (R = -1); (b) mean torsional shear stress tests; ( c) fully reversed uniaxial loading (R = -1); (d) mean stress uniaxial tests (tensile or compressive mean stress loading).

Item Type: Thesis (PhD)
Keywords: Material degradation & corrosion & fracture mechanics
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Mechanical Engineering (Sheffield)
Other academic unit: Mechanical and Process Engineering
Identification Number/EthosID: uk.bl.ethos.364694
Depositing User: EThOS Import Sheffield
Date Deposited: 16 Sep 2019 13:35
Last Modified: 16 Sep 2019 13:35
URI: http://etheses.whiterose.ac.uk/id/eprint/21765

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