Mode II stress intensity factors for a crack parallel to the surface of an elastic half-space subjected to a moving point load |
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Authors: | AD Hearle KL Johnson |
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Institution: | University of Cambridge, Department of Engineering, Trumpington Street, Cambridge CB2 1PZ, U.K. |
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Abstract: | The direction of propagation of rolling contact fatigue cracks is observed to depend upon the direction of motion of the load. In this paper approximate calculations are described of the variation of Mode II stress intensity factors at each tip of a subsurface crack, which lies parallel to the surface of an elastic half-space, due to a load moving over the surface. In particular the effect of frictional locking of the crack faces under the load is investigated. In consequence of frictional locking the range of SIF at the trailing tip ΔKT is found to be about 30% greater than that of the leading tip ΔKL, which is consistent with observations that subsurface cracks propagate predominantly in the direction of motion of the load over the surface. The effects on kt and klof crack length, crack face friction, traction forces at the surface and residual shear stresses are also investigated. |
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