Analysis of Residual Stress State in Deep-Rolled HT-Bolts

Analysis of Residual Stress State in Deep-Rolled HT-Bolts

J. Unglaub, J. Hensel, R. Wimpory, T. Nitschke-Pagel, K. Dilger, K. Thiele

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Abstract. Results of residual stress measurements of HT-bolts gained by neutron diffraction at HZB will be presented. The in-depth residual stress of different conditions of “rolled-before heat-treatment and galvanized” M24 HT-bolts made from 33MnCrB5-2 will be shown: As-manufactured, pre-stressed and fatigue loaded. Additionally, results of an unloaded, “rolled-after heat-treatment and hot-dipped” galvanized M36 HT-bolt will be presented. It will be shown that the manufacturing sequence “rolled-before heat-treatment and galvanized” can develop compressive residual stresses due to heat-treatment close to the surface and that “rolled-after heat-treatment and hot-dipped” shows a contraire residual stress path as “rolled-before heat-treatment and galvanized” with a maximum below the surface.

HT-Bolts, Deep Rolling, Residual Stress Measurement, Neutron Diffraction

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: J. Unglaub, J. Hensel, R. Wimpory, T. Nitschke-Pagel, K. Dilger, K. Thiele, ‘Analysis of Residual Stress State in Deep-Rolled HT-Bolts’, Materials Research Proceedings, Vol. 6, pp 209-214, 2018


The article was published as article 33 of the book Residual Stresses 2018

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[1] Panic, D., Beier, T., Vormwald, M.: Damage Assessment of Threaded Connections based on an Advanced Material Model and Local Concepts. Procedia Engineering 74 (2014), S. 119–128.
[2] Stephens, R., Bradley, C., Horn, N., Gradman, J., Arkema, J., Borgwardt, C.: Fatigue of High Strength Bolts Rolled Before or After Heat Treatment with Five Different Preload Levels. 2005 SAE World Congress (2005).
[3] Wimpory, R. C.; Ohms, C.; Hofmann, M.; Schneider, R.; Youtsos, A. G. (2009): Statistical analysis of residual stress determinations using neutron diffraction. In: International Journal of Pressure Vessels and Piping 86 (1), S. 48–62.
[4] Unglaub, J., Reininghaus, M., Thiele, K.: The fatigue behaviour of bolts with large diameters under overloading. In: The Eighth International Conference on Low Cycle Fatigue (LCF8) 27.- 29.06 2017 Dresden (2017).