Browsing by Author "Price, JWH"
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- ItemInvestigation of reference samples for residual strain measurements in a welded specimen by neutron and synchrotron x-ray diffraction(Elsevier, 2006-11-15) Paradowska, AM; Finlayson, TR; Price, JWH; Ibrahim, R; Steuwer, A; Ripley, MIIn this research, both neutron and synchrotron X-ray diffraction techniques have been used to investigate variations in measured d spacing in two reference samples. The reference “stress-free” samples, a set of cubes and a comb sample, were produced using electro-discharge machining (EDM) to obtain a macro-strain-relieved condition. It is shown that there is a variation in microstructure across the parent metal, heat-affected zone (HAZ) and weld metal. A study of the issues in using the cubes and comb sample to provide reference d0 values for the measurement of residual stress in welding is presented. © 2006 Elsevier B.V.
- ItemInvestigation of residual stress in multi-bead on plates(Australian Institute of Physics, 2006-02-07) Paradowska, AM; Price, JWH; Finlayson, TR; Ibrahim, R; Belvins, R; Ripley, MIThe neutron diffraction technique is used to investigate and compare the residual stress characteristics in fully restrained samples with different numbers of beads. The aim of the research was to characterize the residual stress distribution which arises in a welded component with increasing the number of passes or beads. These results support the concept that welding integrity can be increased as additional layers of welding are added
- ItemInvestigation of strain-free reference for residual strain measurements in a weldments by neutron and synchrotron diffraction(Elsevier B. V., 2005-11-27) Paradowska, AM; Finlayson, TR; Price, JWH; Ibrahim, R; Steuwer, A; Ripley, MIThe measurement of residual strain using diffraction techniques relies on the determination of a change in lattice parameter relative to reference or 'strain free' lattice parameter. Elucidating a relevant reference lattice parameter is the most important part of any diffraction-based, residual strain experiment. In this research, neutron and synchrotron diffraction techniques have been used to investigate the strain distribution in strain reference samples used to establish the residual stresses due to welding. It is shown that there is a variation in measured diffraction angles along the length of the weld, in particular for a parent metal, heat-affected zone (HAZ) and weld metal. The stress-free samples, cuboid and a comb sample, were produced A study of the issues in using the cubes and comb sample, were produced using electro-discharge maching (EDM) to obtain a macro-strain relieved condition and reveal information about microstructural and intergranular strain variations, residual stress in welding is presented. A study is presented of the application of a strain-free cuboid and a comb sample in the flux-cored arc welding (FCAW) process
- ItemResidual stress distribution in steel butt welds measured using neutron and synchrotron diffraction(Institute of Physics, 2009-03-25) Paradowska, AM; Price, JWH; Finlayson, TR; Lienert, U; Walls, P; Ibrahim, R70 keV synchrotron radiation and thermal neutrons have been employed to investigate the residual stress characteristics in a fully restrained, steel, butt weld. The focus is on the values of the subsurface and through-thickness strain/stress variation in the middle of the weld. The advantages and limitations of the techniques have been addressed, in relation to the gauge volume, the stress-free reference sample and positioning. The measurement of residual stress around the weld achieved in this work significantly improves the resolution at which residual stress in welded components has been determined. © 2009, Institute of Physics
- ItemResidual stress measurements by neutron diffraction in multi-bead welding(Elsevier, 2006-11-15) Paradowska, AM; Price, JWH; Ibrahim, R; Finlayson, TR; Blevins, RJ; Ripley, MIThe neutron diffraction technique is used to investigate and compare the residual stress characteristics in fully restrained samples with different numbers of beads. The aim of the research was to characterize the residual stress distribution which arises in a welded component with increasing the number of passes or beads. The resolution of the measurements carried out in this work achieves a new level of detail and reveals significant features of the residual stress pattern in multi-bead welding. The findings have important consequences for the design of welding procedures, demonstrating the effects of placing new beads on prior welding. © 2006 Elsevier B.V.
- ItemResidual stress measurements by neutron diffraction in welded steel structures(The Bragg Institute, Australian Nuclear Science and Technology Organisation, 2005-11-27) Paradowska, AM; Price, JWH; Finlayson, TR; Ibrahim, R; Blevins, RJ; Ripley, MIIn this paper the neutron diffraction technique is used to investigate and compare the residual stress characteristics due to various restraints for a single bead and in fully restrained samples with different numbers of beads. The aim of the research was to characterize the residual stress distribution which arises in a welded component with increasing the number of passes. The care and resolution of the measurements carried out in this work achieves a new level of detail and reveals significant features of the residual stress pattern in multi-bead welding. The findings have important consequences for the design of welding procedures, and fitness-for-purpose assessments. © The Authors