Plasticity and Stress Heterogeneity Influence on Mechanical Stress Relaxation Residual Stress Measurements

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Two common problems of mechanical strain relaxation(MSR) residual stress measurement methods are investigated in this work:(1) assumption of stress uniformity and (2) the effect of plasticity at relaxation. A new MSR technique, designed specifically for highly non-uniformin-plane residual stress fields, is applied in this work to measure the residual stress field resulted from pure bending of an Al7075 alloy.The method involves introducing a straight cut across the whole part in a single increment, and collecting full field displacement fields from the side surface. Application of a 2D high resolution digital image correlation (DIC) method proved successful in this work.The reconstructed residual stress agrees well with that predicted by FE modelling. It is shown that the direction of the propagation of the slit has a major influence on plastic flow during relaxation.The major conclusion from this work is that it is possible to substantially reduce, or completely eliminate, plastic flow on relaxation by careful planning of the slit orientation and the cutting schedule.

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Edited by:

M. François, G. Montay, B. Panicaud, D. Retraint and E. Rouhaud

Pages:

249-255

Citation:

H. K. Kim et al., "Plasticity and Stress Heterogeneity Influence on Mechanical Stress Relaxation Residual Stress Measurements", Advanced Materials Research, Vol. 996, pp. 249-255, 2014

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August 2014

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[1] W. Cheng and I. Finnie. Residual Stress Measurement and the Slitting Method. Springer, New York, (2007).

[2] G. S. Schajer. Measurement of non-uniform residual stresses using the hole-drilling method. part i - stress calculation procedures. Journal of Engineering Materials and Technology, 110: 339- 343, (1988).

DOI: https://doi.org/10.1115/1.3226059

[3] A. H. Mahmoudi, C. E. Truman, D. J. Smith, and M. J. Pavier. The effect of plasticity on the ability of the deep hole drilling technique to measure axisymmetric redidual stress. International Journal of Mechanical Sciences, 53: 978-988, (2011).

DOI: https://doi.org/10.1016/j.ijmecsci.2011.08.002

[4] A. A. Garcia-Granada, D. J. Smith, and M. J. Pavier. A new procedure based on Sachs' boring for measuring non-axisymmetric redidual stresses. International Journal of Mechanical Sciences, 42: 1027-1047, (2000).

DOI: https://doi.org/10.1016/s0020-7403(99)00039-9

[5] M. B. Prime. Cross-sectional mapping of residual stresses by measuring the surface contour after a cut. Journal of Engineering Materials and Technology, 123: 162-168, (2001).

DOI: https://doi.org/10.1115/1.1345526

[6] M. B. Prime. Plasticity effects in incremental slitting measurement of residual stresses. Engineering Fracture Mechanics, 77: 1552-1566, (2010).

DOI: https://doi.org/10.1016/j.engfracmech.2010.04.031

[7] S. H. Shin. FEM analysis of plasticity-induced error in measurement of welding residual stress by the contour method. Journal of Materials Science and Technology, 19(10): 1885-1890, (2005).

DOI: https://doi.org/10.1007/bf02984267

[8] Y. C. Lin and C. P. Chou. Error induced by local yielding around hole in hole drilling methond for measuring residual stress of materials. Materials Science and Technology, 11: 600-604, (1995).

DOI: https://doi.org/10.1179/mst.1995.11.6.600

[9] S. Timoshenko and J. N. Goodier. Theory of Elasticity. McGraw-Hill, 3 edition, (1970).

[10] I. A. Razumovskii and A. L. Shterenlikht. Determining the locally-nonuniform residual-stress fields in plane parts by the sectioning method. Journal of Machinery Manufacture and Reliability C/C of Problemy Mashinostroeniia i Nadezhnosti Mashin, 4: 40-45, 2000. Allerton Press, USA, ISSN: 1052-6188.

[11] H. K. Kim, M. J. Pavier, and A. Shterenlikht. Measuring locally non-uniform in-plane residual stress with straight cuts and DIC. In Proceedings of 9th International Conference on Advances in Experimental Mechanics, 3-5 September 2013, Cardiff, Wales, UK. The British Society for Strain Measurements.

[12] Dantec Dynamics. ISTRA 4D Software Manual Q-400 system. (2012).

[13] M A Sutton, J H Yan, V Tiwari, H W Schreier, and J J Orteu. The effect of out-of-plane motion on 2D and 3D digital image correlation measurements. Optics and Lasers in Engineering, 46: 746-757, (2008).

DOI: https://doi.org/10.1016/j.optlaseng.2008.05.005

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