A Procedure to Measure Biaxial Near Yield Residual Stresses Using the Deep Hole Drilling Technique
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A Procedure to Measure Biaxial Near Yield Residual Stresses Using the Deep Hole Drilling Technique A.H. Mahmoudi & G. Zheng & D.J. Smith & C.E. Truman & M.J. Pavier
Received: 29 September 2012 / Accepted: 5 February 2013 # Society for Experimental Mechanics 2013
Abstract Deep Hole Drilling (DHD) is a mechanical strain relief technique used to measure residual stresses within engineering components. Such techniques measure strains or displacements when part of the component is machined away and typically assume elastic unloading. However, in components containing high levels of residual stress, elastic–plastic unloading can occur which may introduce substantial error. For the case of the DHD technique, a modification to the technique referred to here as the incremental or iDHD technique has been developed to allow such high levels of residual stress to be measured. Previous work has demonstrated the accuracy of the iDHD technique, although only for axisymmetric residual stress distributions. In the present investigation, the application of the iDHD technique has been extended to the general case of biaxial residual stress fields. Finite element simulations are first carried out to demonstrate the ability of the iDHD technique to measure biaxial residual stress. Experimental measurements were then made on shrink fit components and ring welded components containing biaxial residual stress to investigate the performance of the technique in practice. Good agreements between iDHD measurements, neutron diffraction measurements and FE predictions of the residual stresses were obtained, demonstrating the generally improved accuracy of the iDHD technique compared to the standard DHD approach. Keywords Incremental deep hole drilling . Residual stress . Finite element . Shrink fit . Neutron diffraction
A.H. Mahmoudi (*) Department of Mechanical Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran e-mail: [email protected] G. Zheng : D.J. Smith : C.E. Truman : M.J. Pavier Department of Mechanical Engineering, University of Bristol, Bristol BS8 1TR, UK
Introduction Tensile residual stresses may reduce the life of engineering components and are generally thought of as harmful whereas compressive residual stresses can increase life. In either case, residual stresses affect the structural integrity of engineering structures [1] and it is therefore necessary to determine the magnitude of these stresses in order properly to assess their influence [2, 3]. Residual stress measurement techniques which rely on material removal are generally called Mechanical Strain Relief (MSR) techniques [3]. Since in these techniques some machining is carried out on the component being measured they are categorized as either destructive or semi-destructive, depending on the particular MSR technique being used. Destructive techniques do not allow further measurements to be made on the component, while semi-destructive techniques allow a number of measurements. The Deep Hole Drilling (DHD) technique is a semi-destructive te
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