Philip J. Withers
University of Manchester
Composite numberUltimate tensile strengthDigital image correlationOpticsFinite element methodComposite materialTomographyMetallurgyMaterials scienceWeldingSuperalloyDiffractionSynchrotronResidual stressAluminiumNeutron diffractionCrack closurePlasticityMicrostructureStress (mechanics)
880Publications
66H-index
23.2kCitations
Publications 898
Newest
#1Chaitanya Paramatmuni (Imperial College London)H-Index: 1
#2Yi Guo (Imperial College London)H-Index: 32
Last. Fionn P.E. Dunne (Imperial College London)H-Index: 37
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Abstract Locating the heterogeneous nucleation sites of deformation twins in HCP metals, where nucleation occurs by stress assisted dissociation of dislocations accumulated at the grain boundaries during the inception stage, is necessary to understand twin formation. This work presents a detailed investigation of twin inception to locate nucleation site within a full 3D reconstructed microstructure obtained using 3D-EBSD. Experimental characterisation and analyses allow determination of the nucl...
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#1Bartlomiej Winiarski (Thermo Fisher Scientific)H-Index: 9
#2Ali Gholinia (University of Manchester)H-Index: 24
Last. Philip J. Withers (University of Manchester)H-Index: 66
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Abstract There is an increasing requirement for the acquisition of large two (2D) or three (3D) dimensional electron back scattered diffraction (EBSD) maps. It is a well-known, but largely neglected fact, that EBSD maps may contain distortions. There are long-range distortions, which can be caused by the interaction of the sample and the beam geometry and it can also arise from sample or beam drift. In addition there are shorter range artefacts arising from topological features, such as curtaini...
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#1Z.K. Wu (Southwest Jiaotong University)H-Index: 1
#2Shengchuan Wu (Southwest Jiaotong University)H-Index: 21
Last. Philip J. Withers (University of Manchester)H-Index: 66
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Abstract Metallurgical defects are critical to influence the anisotropic fatigue resistance of additively manufactured metals under cyclic loading. For selective laser melted AlSi10Mg alloy, X-ray computed tomography was firstly adopted to detect the spatial features of defects, and high cycle fatigue (HCF) properties and fatigue crack growth were performed on specimens in both parallel and perpendicular to build direction. It is found that the horizontal specimens exhibit a higher fatigue stren...
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#1Ying Wang (University of Manchester)H-Index: 12
#2Xu Xu (University of Manchester)
Last. Timothy L. Burnett (University of Manchester)H-Index: 19
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Abstract The damage mechanisms and load redistribution taking place under high temperature (350°C), high cycle fatigue (HCF) of TC17 titanium alloy/unidirectional SiC fibre composites have been investigated in situ using synchrotron X-ray computed tomography (CT) and X-ray diffraction (XRD) under two stress amplitudes. The three-dimensional morphology of the fatigue crack and fibre fractures has been mapped by CT. At low stress amplitude, stable growth occurs with matrix cracking deflecting by 5...
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#1Yu-jie Huang (WHU: Wuhan University)
#2Hui Zhang (WHU: Wuhan University)
Last. Philip J. Withers (University of Manchester)H-Index: 66
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Abstract The damage and fracture mechanisms of concrete are complicated due to the material’s inherent meso-scale heterogeneities. In this study, continuous random fields for selected properties, such as the tensile strength, are first generated on the basis of real microscale X-ray Computed Tomography (CT) images of concrete, using statistical reconstruction algorithms and the Karhunen-Loeve expansion technique. The random fields are then assigned to finite element models with mesoscale crack i...
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#1Anuj PrajapatiH-Index: 1
Last. Philip J. WithersH-Index: 66
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#1Xiang Li Zhong (University of Manchester)H-Index: 4
#1Xiang Li Zhong (University of Manchester)H-Index: 14
Last. M. Grace Burke (University of Manchester)H-Index: 11
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#1Parmesh Gajjar (University of Manchester)H-Index: 6
#2Christopher Johnson (University of Manchester)H-Index: 13
Last. Philip J. Withers (University of Manchester)H-Index: 66
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When opening a box of mixed nuts, a common experience is to find the largest nuts at the top. This well-known effect is the result of size-segregation where differently sized ‘particles’ sort themselves into distinct layers when shaken, vibrated or sheared. Colloquially this is known as the ‘Brazil-nut effect’. While there have been many studies into the phenomena, difficulties observing granular materials mean that we still know relatively little about the process by which irregular larger part...
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#1Ziyi Wang (Southwest Jiaotong University)
#2Shengchuan Wu (Southwest Jiaotong University)H-Index: 21
Last. Philip J. Withers (University of Manchester)H-Index: 66
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Abstract This paper elucidates the relationship between the primary deformation processes and associated damage mechanisms operating in an extruded AZ31 Mg alloy under uniaxial low-cycle fatigue with an occurrence of ratchetting. Different mean stresses and stress amplitudes were prescribed to study twinning/detwinning-dominated (TDD), twinning/detwinning and slip-dominated (TDSD), and slip-dominated (SD) cyclic deformations, respectively. In each case, the damage was examined by synchrotron rad...
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#1Parmesh GajjarH-Index: 6
Last. Darragh MurnaneH-Index: 14
view all 13 authors...