文献类型：期刊文献

英文题名：In situ mapping of normal strains in the field of a growing fatigue crack in a steel weld using digital image correlation and energy dispersive synchrotron X-ray diffraction

作者：Wigger, T.[1]; Lupton, C.[1]; Alshammrei, S.[1]; Tong, J.[1]; Marrow, T.J.[2]; Earp, P.[2]; Zhu, M.-L.[3]; Wang, D.-Q.[3]; Connolley, T.[4]

机构：[1] Mechanical Behaviour of Materials Group, School of Engineering, University of Portsmouth, Anglesea Building, Anglesea Road, Portsmouth, PO1 3DJ, United Kingdom; [2] Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, United Kingdom; [3] Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China; [4] I12 JEEP Beamline, Diamond Light Source Synchrotron, Harwell Campus, Didcot, OX11 0DE, United Kingdom

年份：2018

卷号：115

起止页码：11

外文期刊名：International Journal of Fatigue

收录：EI(收录号：20182205263808)

语种：英文

外文关键词：Molybdenum steel - Strain - Chromium steel - Uncertainty analysis - X ray diffraction - Heat affected zone - Crack tips - Synchrotron radiation - Chromium alloys - Fatigue crack propagation - Strain measurement - Welding

摘要：Fatigue crack growth in the Heat Affected Zone (HAZ) of a welded CrNiMoV steel has been investigated, in situ, using Digital Image Correlation (DIC) and Energy Dispersive X-ray Diffraction (EDXD). Compact tension specimens of welded joint were loaded under tension–tension cyclic loading. The crack tip position and the evolution of the near-tip strains normal to the crack plane were tracked at selected positions for a growing fatigue crack both on the specimen surface using DIC and in the bulk of the specimen using EDXD of synchrotron X-rays. The uncertainty and quality of the DIC measurements were examined with regard to some of the key data processing parameters, including subset size and the size of measurement window; whilst the measurement errors in the EDXD measurements were also estimated. A "characteristic" strain was estimated, in the bulk of the specimen and on the specimen surface, from the average strains captured at selected positions when the propagating fatigue crack tip reached these positions. ? 2018 Elsevier Ltd