Hole Drilling Residual Stress Evaluations in Cast Iron

Hole Drilling Residual Stress Evaluations in Cast Iron

M. Lundberg, L. Elmquist

Abstract. Incremental hole drilling for residual stress measurement are widely used in industry today and is considered to be a cheap and fairly reliable method for stress measurements. Even though the method assumes isotropic material, it has been expanded to orthotropic materials such as composite laminates. With heterogeneous material like grey cast iron, the reliability and accuracy of the method still often fails to provide residual stress data valid for analysis. Cast iron microstructural aspects that complicate the analysis are the graphite and its morphology, variations in matrix structures and casting defects. These features can extend over different length scales and give cast iron highly localised mechanical properties. Global engineering parameters, such as Young’s modulus and Poisson’s ratio, are used together with the locally measured strains to calculate the residual stresses. Utilizing global material parameters while measuring locally can provide false stress results. Grey cast iron exhibits a non-linear elastic behaviour and the Young’s modulus can change significantly and can therefore result in very different calculated residual stresses. Experiments were conducted on cast stress lattices utilizing incremental hole drilling to measure strains. To calculate the residual stresses, global material parameters and standard evaluation procedures in accordance to ASTM E837 were used. Results show that the method is questionable for grey cast iron but can be used for ductile iron. Lack of material properties knowledged are suggested to be the main obstacle for residual stress evaluations on grey cast iron as the accuracy of the method decreases as hole depth approaches 1 mm.

Keywords
Incremental Hole Drilling, Residual Stresses, Grey Cast Iron, Ductile Iron

Published online 9/11/2018, 6 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: M. Lundberg, L. Elmquist, ‘Hole Drilling Residual Stress Evaluations in Cast Iron’, Materials Research Proceedings, Vol. 6, pp 89-94, 2018

DOI: http://dx.doi.org/10.21741/9781945291890-15

The article was published as article 15 of the book Residual Stresses 2018

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

References
[1] D. Dye, S.M. Roberts, P.J. Withers, R.C. Reed, The determination of the residual strains and stresses in a tungsten inert gas welded sheet of IN718 superalloy using neutron diffraction, J. Strain Anal. Eng. Des. 35 (2000) pp 247–259. https://doi.org/10.1243/0309324001514396
[2] V. Fontanari, F. Frendo, T. Bortolamedi, P. Scardi, Comparison of the hole-drilling and X-ray diffraction methods for measuring the residual stresses in shot-peened aluminium alloys, J. Strain Anal. Eng. Des. 40 (2005) pp 199–209. https://doi.org/10.1243/030932405X7791
[3] D. Kirk, D.G. Birch, Residual stresses induced by peening austenitic ductile cast iron, in: 7th Int. Conf. Shot Peen., 1999: pp. 23–32.
[4] C.R. Knowles, T.H. Becker, R.B. Tait, Residual stress measurements and structural integrity implications for selective laser melted ti-6al-4v, Sajie. 23 (2012) pp 119–129. https://doi.org/10.7166/23-3-515
[5] W. Bouzid Saı̈, N. Ben Salah, J.L. Lebrun, Influence of machining by finishing milling on surface characteristics, Int. J. Mach. Tools Manuf. 41 (2001) pp 443–450. https://doi.org/10.1016/S0890-6955(00)00069-9
[6] K. Sasaki, M. Kishida, T. Itoh, The accuracy of residual stress measurement by the hole-drilling method, Exp. Mech. 37 (1997) pp 250–257. https://doi.org/10.1007/BF02317415
[7] E. Kingston, Residual stress measurements within the nodular cast iron PWR insert of a radioactive waste canister, 2013.
[8] J.E. Wyatt, J.T. Berry, A.R. Williams, Residual stresses in aluminum castings, J. Mater. Process. Technol. 191 (2007) pp 170–173. https://doi.org/10.1016/j.jmatprotec.2007.03.018
[9] M. Lundberg, R.L. Peng, M. Ahmad, T. Vuoristo, D. Bäckström, S. Johansson, Residual stresses in shot peened grey and compact iron, HTM – J. Heat Treat. Mater. 69 (2014) pp 38–45. https://doi.org/10.3139/105.110207
[10] J. Saarimäki, M. Lundberg, J.J. Moverare, 3D residual stresses in selective laser melted Hastelloy X, Mater. Res. Proc. 2 (2016) pp 73–78.
[11] M. Lundberg, J. Saarimäki, J.J. Moverare, R.L. Peng, Effective X-ray elastic constant of cast iron, J. Mater. Sci. 53 (2017) pp 2766–2773. https://doi.org/10.1007/s10853-017-1657-6
[12] SS-EN ISO 945-1:2008, 2011.
[13] D. Stefanescu, C.E. Truman, D.J. Smith, P.S. Whitehead, Improvements in residual stress measurement by the incremental centre hole drilling technique, Exp. Mech. 46 (2006) pp 417–427. https://doi.org/10.1007/s11340-006-7686-8
[14] G.S. Schajer, Measurement of non-uniform residual stresses using the hole-drilling method. Part II—Practical application of the integral method, J. Eng. Mater. Technol. 110 (1988) pp 344–349. https://doi.org/10.1115/1.3226060
[15] G.S. Schajer, Measurement of non-uniform residual stresses using the hole-drilling method. Part I—Stress calculation procedures, J. Eng. Mater. Technol. 110 (1988) pp 338–343. https://doi.org/10.1115/1.3226059
[16] P. Schmidt, L.P. Ru, V. Davydov, M. Lundberg, M. Ahmad, T. Vuoristo, D. Bäckström, S. Johansson, Analysis of residual stress in stress harps of grey iron by experiment and simulation, Adv. Mater. Res. 996 (2014) pp 586–591. https://doi.org/10.4028/www.scientific.net/AMR.996.586
[17] M.R. Ayatollahi, A.R. Torabi, Tensile fracture in notched polycrystalline graphite specimens, Carbon N. Y. 48 (2010) pp 2255–2265. https://doi.org/10.1016/j.carbon.2010.02.041
[18] D. Kirk, Ductility and strength properties of shot peened surfaces, 2006.
[19] M. Lundberg, M. Calmunger, R.L. Peng, In-situ SEM / EBSD study of deformation and fracture behaviour of flake cast iron, in: 13th Int. Conf. Fract., 2013: pp. S12-038.
[20] T. Sjögren, Influences of the Graphite Phase on Elastic and Plastic Deformation Behaviour of Cast Irons, Institutionen för ekonomisk och industriell utveckling, 2007.
[21] C. Barile, C. Casavola, G. Pappalettera, C. Pappalettere, Remarks on residual stress measurement by hole-drilling and electronic speckle pattern interferometry., ScientificWorldJournal. (2014) id:487149.
[22] M. Lundberg, J. Saarimäki, R.L. Peng, J.J. Moverare, Residual stresses in uniaxial cyclic loaded pearlitic lamellar graphite iron, Mater. Res. Proc. 2 (2017) pp 67–72. https://doi.org/10.21741/9781945291173-12