Accessible Unlicensed Requires Authentication Published by De Gruyter May 26, 2013

Calculation of S-N Curves for Different Mean Stresses on the Basis of “PHYBALmean” for the Quenched and Tempered Steel SAE 4140

Berechnung von Wöhlerkurven für verschiedene Mittelspannungsverhältnisse auf der Basis von “PHYBALmean” für den Vergütungsstahl 42CrMo4
Peter Starke and Dietmar Eifler
From the journal Materials Testing

Abstract

Recently, a couple of methods for the physically based fatigue life calculation of metallic materials were developed at the Institute of Materials Science and Engineering at the University of Kaiserslautern. The focus of these “PHYBAL”-methods is the reduction of the necessary experiments in comparison to the conventional determination of fatigue data. The application of the “PHYBAL”-method requires a limited number of high-precision fatigue experiments. In addition to conventional mechanical stress-strain hysteresis measurements temperature and electrical resistance measurements have to be carried out to characterize the cyclic deformation behaviour. So far the “PHYBAL”-versions “PHYBALW” (σW = endurance limit), “PHYBALLIT ” (LIT = load increase test), “PHYBALSB ” (SB = scatter bands) and “PHYBALmean ” (mean = mean stress) are available and were successfully applied on different unalloyed carbon steels as well as austenitic steels, cast irons and light alloy metals.

Kurzfassung

In den letzten Jahren wurden am Lehrstuhl für Werkstoffkunde der TU Kaiserslautern eine Reihe von Methoden zur physikalisch basierten Lebensdauerberechnung entwickelt. Das Ziel dieser “PHYBAL“-Methoden ist die Reduktion der Anzahl von Ermüdungsversuchen gegenüber der konventionellen Ermittlung von Ermüdungsdaten. Die Anwendung der “PHYBAL“-Methoden erfordert nur einen geringen Umfang an Ermüdungsexperimenten. Zusätzlich zu konventionellen mechanischen Spannung-Dehnung-Hysteresismessungen wurden Temperatur und elektrische Widerstandsmessverfahren zur Charakterisierung des Ermüdungsverhaltens eingesetzt. Derzeit werden die folgenden “PHYBAL”-Versionen erfolgreich an unlegierten und austenitischen Stählen, Gusseisenwerkstoffen und Leichtmetalllegierungen eingesetzt: “PHYBALW” (σW = endurance limit, Dauerfestigkeit), “PHYBALLIT” (LIT = load increase test, Laststeigerungsversuch), “PHYBALSB” (SB = scatter bands, Streuband) und “PHYBALmean” (mean = mean stress, Mittelspannung).


Dr. Peter Starke, born in 1977, studied mechanical engineering at the University of Kaiserslautern. Since 2002 he has been scientific assistant at the Institute of Materials Science and Engineering at the University of Kaiserslautern, Germany. He received his PhD in 2007 working on “The fatigue life calculation of metallic materials under constant amplitude loading and service loading”. His research is mainly focused on the characterization of the fatigue behaviour of cast irons and high strength steel as well as the fatigue life calculation of metallic materials on the basis of physical quantities in the LCF-, HCF- and VHCF-regime.

Prof. Dietmar Eifler, born in 1949, studied mechanical engineering, received his PhD in 1981 working on “The cyclic deformation behaviour of quenched and tempered steels” and received his postdoctoral lecture qualification (habilitation) in 1991 working on “The influence of elevated temperatures and mean stresses on the cyclic deformation behaviour of steels” at the University of Karlsruhe, Germany. From 1991 to 1994 he was professor at the University of Essen, Germany. Since 1994 he has been professor at the Institute of Materials Science and Engineering at the University of Kaiserslautern. His research is mainly focused on the cyclic deformation behaviour of metallic materials in the LCF-, HCF- and VHCF-regime, furthermore medical implant materials and innovative joining techniques like ultrasonic welding and friction stir welding.


References

1 R. W.Landgraf, J.Morrow, T.Endo: Determination of the Cyclic Stress-Strain Curve, J. Mater.4 (1969), pp. 176188Search in Google Scholar

2 P.Lukáš, M.Klesnil: Cyclic stress-strain response and fatigue life in metals in low amplitude region, Mater Sci. Eng.11 (1973), pp. 345356Search in Google Scholar

3 D.Dengel, H.Harig: Estimation of the fatigue limit by progressively increasing load tests, Fatigue Fract. Eng. Mat.3 (1980), pp. 113128Search in Google Scholar

4 J.Polák: Electrical resistivity of cyclically deformed copper, Czech. J. Phys. B.19 (1969), pp. 315322Search in Google Scholar

5 G.La Rosa, A.Risitano: Thermographic methodology for rapid determination of the fatigue limit of materials and mechanical components, Int. J. Fatigue22 (2000), pp. 6573Search in Google Scholar

6 G.Meneghetti: Analysis of the fatigue strength of a stainless steel based on the energy dissipation, Int. J. Fatigue29 (2007), pp. 8194Search in Google Scholar

7 F.Walther, D.Eifler: Cyclic deformation behaviour of steels and light-metal alloys, Mat. Sci. Eng. A468–470 (2007), pp. 259266Search in Google Scholar

8 P.Starke, D.Eifler: Fatigue assessment and fatigue life calculation of metals on the basis of mechanical hysteresis, temperature, and resistance data, Materials Testing51 (2009), No. 5, pp. 261268Search in Google Scholar

9 P.Starke, F.Walther, D.Eifler: New fatigue life calculation method for quenched and tempered steel SAE 4140, Mat. Sci. Eng. A523 (2009), No. 1–2, pp. 246252Search in Google Scholar

10 M.Smaga, F.Walther, D.Eifler: Deformation-induced martensitic transformation in metastable austenitic steels, Mat. Sci. Eng. A483–484 (2008), pp. 394397Search in Google Scholar

11 J. D.Morrow: Cyclic plastic strain energy and fatigue of metals, ASTM-Internal Friction, Damping and Cyclic Plasticity STP378 (1964), pp. 4587Search in Google Scholar

Published Online: 2013-05-26
Published in Print: 2013-01-01

© 2013, Carl Hanser Verlag, München