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A simple procedure for estimating SN-lines for crack initiation from SN-lines for total failure*

  • Cetin Morris Sonsino
Published/Copyright: May 16, 2018
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Materials Testing
From the journal Materials Testing Volume 57 Issue 1

Abstract

A simple procedure is proposed for estimating the SN-line for the failure criterion of fatigue life to crack initiation of components not subjected to a surface treatment. The prerequisite is the availability of a SN-line for total failure, i. e. rupture, with the scatter-band Tσ between the probabilities of survival Ps = 10 and 90 %, the knee point Nk and the slopes kf and k* before and after the knee point. The SN-line for crack initiation with Ps = 50 % is positioned at the knee point Nk of the SN-line with Ps = 90 % for total failure. The slope kcr for N < Nk cycles results from the exponent of the elastic portion of the strain controlled SN-line for crack initiation, obtained with unnotched specimens, and the slope k* after the knee point remains the same as that for the line for total failure. The SN-line for crack initiation possesses the same scatter-band Tσ as the line for total failure.

Kurzfassung

Es wird ein einfaches Verfahren zur Abschätzung von Anrisswöhlerlinien für nicht oberflächennachbehandelte Bauteile vorgeschlagen. Voraussetzung ist das Vorhandensein einer Bauteilwöhlerlinie für das Versagenskriterium Bruch mit dem Streumaß Tgσ zwischen den Überlebenswahrscheinlichkeiten Pü = 10 und 90 %, mit dem Abknickpunkt Nk und den Neigungen kB und k* vor und nach dem Abknickpunkt. Die Anrisswöhlerlinie mit Pü = 50 % wird am Abknickpunkt der Bauteilwöhlerlinie für Bruch mit Pü = 90 % positioniert. Die Neigung kA im Bereich von N < Nk Schwingspielen ist die Neigung des elastischen Anteils der mit ungekerbten Proben dehnungsgesteuert ermittelten Anrisswöhlerlinie. Die Neigung k* der Anrißwöhlerlinie nach dem Abknickpunkt entspricht derjenigen der Bruchwöhlerlinie. Für die Anrißwöhlerlinie wird das Streumaß Tσ der Bruchwöhlerlinie übernommen.

§Correspondence Address, Prof. Dr.-Ing. C. M. Sonsino, Fraunhofer Institute for Structural Durability and System Reliability LBF, Bartningstraße 47, 64289 Darmstadt, E-mail:

University Darmstadt (TUD) and, since 1973, has been with the Fraunhofer Institute for Structural Durability and System Reliability LBF in Darmstadt. He received his doctoral degree 1982 in the field of cold working and low-cycle fatigue at the Technical University Darmstadt. Since 1990, he has lectured at the Universität des Saarlandes, Saarbrücken, and since 2002, at the Technical University Darmstadt the subject “Structural Durability – Component Related Material Behaviour”. Prof. Sonsino was chairman of the DVM Working Group Structural Durability, Vice Director of the LBF, and headed the Business Unit Industry and Associations. Since his retirement end of 2011, he is acting as a scientific-technical advisor of LBF. He is still lecturing in different universities abroad and giving industrial seminars on structural durability.

References

1 V.Grubisic, C. M.Sonsino: Festigkeit von Hochdruckbehältern für neuartige Fertigungsverfahren, Bericht-Nr. FB-148, Fraunhofer-Institut für Betriebsfestigkeit (LBF), Darmstadt, Germany (1979)Search in Google Scholar

2 C. M.Sonsino, H.Kaufmann, V.Grubisic: Übertragbarkeit von Werkstoffkennwerten am Beispiel eines betriebsfest auszulegenden geschmiedeten Nutzfahrzeug-Achsschenkels, Konstruktion47 (1995), No. 7–8, pp. 222–232Search in Google Scholar

3 C. M.Sonsino, H.Kaufmann, V.Grubisic: Transferability of material data for the example of a randomly loaded forged truck stub axle, SAE-Paper No. 970 708 (1997), SAE Transactions Section 5 (1997), Journal of Materials and Manufacturing106 (1997), pp. 649–670Search in Google Scholar

4 U.Brandt: Schwingfestigkeitsuntersuchungen von ABS/ASR-Gehäusen unter Innendruck, LBF-Report No. 7907/8418, Fraunhofer-Institut für Betriebsfestigkeit (LBF), Darmstadt, Germany (1997), unpublishedSearch in Google Scholar

5 V.Grubisic, C. M.Sonsino: Influence of local strain distribution on low-cycle fatigue behaviour of thick-walled structures, ASTM STP 770, C.Amzallag, B. N.Leis, P.Rabbe (Eds.), ASTM International, West Conshohocken, PA, USA (1982), pp. 612–629Search in Google Scholar

6 C. M.Sonsino: Course of SN-curves especially in the high-cycle fatigue regime with regard to component design and safety, Int. J. Fatigue29 (2007) 12, pp. 2246–225810.1016/j.ijfatigue.2006.11.015Search in Google Scholar

7 H.Ostermann: Das Festigkeitsverhalten von Bau- und Vergütungsstählen unter zeitlich veränderlicher Beanspruchung, Integration von Maschinen- und Stahlbau, Institut für Fördertechnik, University of Karlsruhe, Germany (1978), pp. 54–71Search in Google Scholar

8 E.Haibach: Betriebsfestigkeit – Verfahren zur Bauteilbemessung, 2. Edition, Springer, Berlin, Germany (2002)10.1007/978-3-662-06038-4Search in Google Scholar

9 C. M.Sonsino: Principles of variable amplitude fatigue design and testing, P. C.McKeighan, N.Ranganathan (Eds.): Fatigue Testing and Analysis under Variable Amplitude Loading Conditions, ASTM STP 1439, ASTM International, West Conshohocken, PA, USA (2005), pp. 3–2310.1520/STP11294SSearch in Google Scholar

10 T.Seeger: Grundlagen der Betriebsfestigkeitsnachweise, Stahlhandbuch – Band 1, Teil B, Stahlbau-Verlagsgesellschaft mbH, Köln (1996), pp. 5–123Search in Google Scholar

11 E.Siebel, M.Stieler: Ungleichförmige Spannungsverteilung bei schwingender Beanspruchung, VDI-Zeitschrift97(1955), pp. 121–126Search in Google Scholar

12 H.Neuber: Über die Berücksichtigung der Spannungskonzentration bei Festigkeitsberechnungen, Konstruktion20 (1968), pp. 245–251Search in Google Scholar

13 D.Taylor: The Theory of Critical Distances: A New Perspective in Fracture Mechanics, Engineering Failure Analysis12 (2005) 6, pp. 906–91410.1016/j.engfailanal.2004.12.007Search in Google Scholar

14 C. M.Sonsino: Ein einfaches Verfahren zur Abschätzung der Anrisslebensdauer beim Vorliegen von Bruchwöhlerlinien, Technische Mitteilungen TM-Nr. 114, Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit (LBF), Darmstadt, Germany (2014)Search in Google Scholar

Published Online: 2018-05-16
Published in Print: 2015-01-05

© 2015, Carl Hanser Verlag, München

Articles in the same Issue

  1. Inhalt/Contents
  2. Inhalt
  3. Fachbeiträge/Technical Contributions
  4. A simple procedure for estimating SN-lines for crack initiation from SN-lines for total failure*
  5. Modellbasierte Korrelation zwischen dem elektrischen Widerstand und der Versetzungsstruktur des ermüdungsbeanspruchten ICE-Radstahls R7
  6. Effect of cobalt on the aging kinetics and the properties of a CuCoNiBe alloy
  7. Effect of heat treatment on microstructure and mechanical properties of Fe-5Cr-1.4B alloy
  8. Interface characterization of friction welded low carbon steel and copper alloys
  9. Field test methods for aluminum gas cylinders
  10. Application of the Taguchi method for parameter optimization of the surface grinding process
  11. A discrete dislocation technique for fatigue microcracks (Part I)
  12. A discrete dislocation technique for fatigue microcracks (Part II)
  13. Synchrotron X-ray CT of rose peduncles – evaluation of tissue damage by radiation*
  14. Surface roughness analysis and optimization for the CNC milling process by the desirability function combined with the response surface methodology
  15. Design, manufacture and analysis of composite epoxy material with embedded silicon carbide (SiC) and alumina (Al2O3) nanoparticles/fibers
  16. Performance of organic and inorganic substances as inhibitors for chloride-induced corrosion in concrete
  17. Fillet welding of austenitic stainless steel using the double channel shielding gas method with cored wire
  18. Applying quadraphonic transmission ultrasonic defectoscopy on standard aluminum materials
  19. Kalender/Calendar
  20. Kalender
https://doi.org/10.3139/120.110671

Articles in the same Issue

  1. Inhalt/Contents
  2. Inhalt
  3. Fachbeiträge/Technical Contributions
  4. A simple procedure for estimating SN-lines for crack initiation from SN-lines for total failure*
  5. Modellbasierte Korrelation zwischen dem elektrischen Widerstand und der Versetzungsstruktur des ermüdungsbeanspruchten ICE-Radstahls R7
  6. Effect of cobalt on the aging kinetics and the properties of a CuCoNiBe alloy
  7. Effect of heat treatment on microstructure and mechanical properties of Fe-5Cr-1.4B alloy
  8. Interface characterization of friction welded low carbon steel and copper alloys
  9. Field test methods for aluminum gas cylinders
  10. Application of the Taguchi method for parameter optimization of the surface grinding process
  11. A discrete dislocation technique for fatigue microcracks (Part I)
  12. A discrete dislocation technique for fatigue microcracks (Part II)
  13. Synchrotron X-ray CT of rose peduncles – evaluation of tissue damage by radiation*
  14. Surface roughness analysis and optimization for the CNC milling process by the desirability function combined with the response surface methodology
  15. Design, manufacture and analysis of composite epoxy material with embedded silicon carbide (SiC) and alumina (Al2O3) nanoparticles/fibers
  16. Performance of organic and inorganic substances as inhibitors for chloride-induced corrosion in concrete
  17. Fillet welding of austenitic stainless steel using the double channel shielding gas method with cored wire
  18. Applying quadraphonic transmission ultrasonic defectoscopy on standard aluminum materials
  19. Kalender/Calendar
  20. Kalender
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