Contour Method: Making the
Cut
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Residual Stress Conferences |
The ideal method for making the cut would satisfy the following:
For a discussion of the assumption about the cut, see M. B. Prime and A. L. Kastengren, "The Contour Method Cutting Assumption: Error Minimization and Correction" Proceedings of the SEM Annual Conference & Exposition on Experimental and Applied Mechanics Indianapolis, Indiana USA, Society for Experimental Mechanics Inc., June 7 - 9, 2010, paper # 507 (LA-UR-10-1605). For more on cutting errors and how to select an EDM machine, see P John Bouchard et al., "Making the Cut for the Contour Method,"Proc. of the 15th Int'l Conf on Experimental Mechanics, Paper 2960, Porto, Portugal, 22-27 July 2012 For some good information on making a good cut, see Hosseinzadeh, F., Ledgard, P., and Bouchard, P., 2012, "Controlling the Cut in Contour Residual Stress Measurements of Electron Beam Welded Ti-6Al-4V Alloy Plates," Experimental Mechanics. Self-restraint, also called embedded cutRecent work has shown great promise for self-restraint to be a better way to hold the part during a cut.
Pictures of EDM cutting for contour measurements:See this paper for a robust technqiue for clamping: Hacini, L., Van Lê, N., and Bocher, P., 2009, "Evaluation of Residual Stresses Induced by Robotized Hammer Peening by the Contour Method," Experimental Mechanics, 49(6), 775-783. It is important
to carefully fixture the part during cutting to keep the cut plane from
moving as stresses relax. So here are some samples of clamping the part:
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