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M Priest

Bio: M Priest is an academic researcher from University of Bristol. The author has contributed to research in topics: Residual stress & Paris' law. The author has an hindex of 3, co-authored 4 publications receiving 130 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors investigated the influence of applied stress, the ratio of the minimum to the maximum applied stress and crack closure on fatigue crack growth in open holes in aluminium alloys 2024-T351 and 2650.

72 citations

Journal ArticleDOI
TL;DR: In this paper, an X-ray diffraction technique was employed to determine the residual stresses introduced by cold working a fastener hole in a 6-mm thick 2024-T351 aluminum plate.
Abstract: An X-ray diffraction technique was employed to determine the residual stresses introduced by cold working a fastener hole in a 6-mm thick 2024-T351 aluminum plate. The radial and tangenital residual stresses were measured at both faces of the plate and the measurements compared with the results from a two-dimensional axisymmetric finite-element model. The comparisons were favorable, although modifying the finite-element model to simulate the X-ray process provided better agreement. Experimental determinations of residual stresses showed differences between the two faces of the plate. This feature was attributed to the directional nature of the cold-working process.

55 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, a welding simulation procedure is developed using the FE software ANSYS in order to predict residual stresses and their relaxation during crack propagation by isoparametric stress mapping between meshes without and with cracks.

150 citations

01 Jan 2008
TL;DR: In this article, a welding simulation procedure is developed using the FE software ANSYS in order to predict residual stresses and their relaxation during crack propagation by isoparametric stress mapping between meshes without and with cracks.
Abstract: In this paper a welding simulation procedure is developed using the FE software ANSYS in order to predict residual stresses. The procedure was verified with temperature and residual stress measurements found in the literature on multi-pass butt welded plates and T-fillet welds. The predictions show qualitative good agreement with experiments. The welding simulation procedure was then employed on a welded ship engine frame box at MAN B&W. A subroutine for LEFM analysis was developed in 2D in order to predict the crack path of propagating fatigue cracks. The objective was to investigate fatigue test results from special designed test bars from the frame box where all test failed from the non-penetrated weld root. A subroutine was developed in order to incorporate the predicted residual stresses and their relaxation during crack propagation by isoparametric stress mapping between meshes without and with cracks, respectively. The LEFM fatigue life predictions shows good agreement with the fatigue test result when the residual stresses are taken into account in the crack growth analysis.

124 citations

Journal ArticleDOI
TL;DR: In this article, the authors used two-dimensional elastic-plastic finite element analyses to predict fatigue crack growth from a hole with a pre-existing compressive residual stress, from which a determination of the crack opening stress as the crack propagates through the residual stress is predicted.

95 citations

Journal ArticleDOI
TL;DR: In this article, the results obtained using models with different levels of complexity are evaluated and the consequences of using some of the normal approximations concerning to the geometry, boundary conditions and type of model used, are evaluated.

79 citations

Journal ArticleDOI
TL;DR: In this paper, a new method of cold expansion is proposed, which uses a tapered pin with a mating tapered split sleeve and creates an almost uniform compressive residual stress around the hole as shown by the FE method.
Abstract: A recognized way of improving the fatigue resistance of a fastener hole is to introduce compressive tangential residual stress around it. This can be achieved by using a cold expansion method in which an oversized pin or ball is forced through the hole to produce a local plastic region surrounded by an elastic one. Once the pin or ball is removed allowing the elastic region to spring back it results in compressive tangential residual stress around the hole. In practise, however, it is found that such a cold expansion method creates a non-uniform residual stress distribution through the plate thickness and even tensile residual stress can be created at the entrance and exit faces. In this paper a new method of cold expansion is proposed. It uses a tapered pin with a mating tapered split sleeve and creates an almost uniform compressive residual stress around the hole as shown by FE method. Also, fatigue tests were carried out to verify that the method does significantly improve fatigue life. Finally the tangential residual stress distribution and fatigue life improvement of this new method were compared with those of a well-established cold expansion method and it was shown that the new method is more efficient in improving fatigue life.

78 citations