Browsing by Author "Beynon, JH"

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    Evaluation of residual stress in SPR joint by neutron diffraction
    (Trans Tech Publication Inc., 2012-01-01) Haque, R; Beynon, JH; Kirstein, O; Wong, YC; Durandet, Y
    The feasibility of measuring residual stresses in Self-Pierce Riveted (SPR) joints by neutron diffraction was evaluated in this study. Despite the small dimensions involved, meaningful results were obtained. It was observed that residual stress in the rivet head was higher in the centre and lower at the edge. For the SPR joints examined, the maximum value of residual stress evaluated was 550MPa, compressive and occurred in the rivet leg. Stresses in material adjacent to the rivet wall and at a distance of three times the rivet radius from the rivet axis were not significant. The results are discussed with respect to the physical events involved during SPR. © 2011, Trans Tech Publications
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    Feasibility of measuring residual stress profile in different self-pierce riveted joints
    (Maney Publishing, 2012-01-01) Haque, R; Beynon, JH; Durandet, Y; Kirstein, O; Blacket, S
    The feasibility of measuring residual stresses in self-pierce riveted (SPR) joints by neutron diffraction technique was investigated. The main challenge involved dealing with the very small dimensions of SPR joints. Two different joints were examined: aluminium‐steel and steel‐steel. Even though small dimensions were involved, meaningful results were obtained. In the rivet head, tensile stress was observed for the steel‐steel sample, whereas only compressive stress was observed for the aluminium‐steel. The residual stress in the rivet head was higher at the centre and lower at the edge for both joints. Stresses in the sheet material beside the rivet wall and at a distance of three times the rivet radius from the rivet axis were not significant. For the SPR joints examined, the maximum value of residual stress was compressive and occurred in the rivet leg. The results are discussed according to the physical events involved during the process.© 2012, Maney Publishing
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    Optimising parameters for meaningful measurement of residual strain by neutron diffraction in self-pierce riveted joints
    (Maney Publishing, 2013-11-18) Haque, R; Durandet, Y; Wong, YC; Paradowska, AM; Beynon, JH; Blacket, S
    The aim of this work is to examine the uncertainties involved in measuring residual strain and their dependence on both the gauge volume of the neutron beam and the acquisition time in self pierce riveted (SPR) joints while using the neutron diffraction technique. The main challenge involved dealing with the very small dimensions of SPR joints and developing optimum instrument configuration that allowed faster and/or more accurate stress measurement in SPR while maintaining the same time resolution required for the millimetre scale of the problem. Two different gauge volumes were used (0.125 and 1.0 mm(3)), and two different measuring directions were chosen in order to examine the rotational accuracy of the sample table. All measurements were conducted in steel–steel joints. Even though small sizes were involved, meaningful results were obtained and measurement errors were reduced by optimising the instrument parameters. © 2013, Maney Publishing