Comments on linear summation hypothesis of fatigue failures

• Autorzy: Szala G.
• Języki publikacji: EN

Abstrakty

EN

This paper presents a comparative analysis of results of fatigue life calculations with the use of the linear summation hypothesis of fatigue failures (LHSUZ), confronted with experimental test results. The calculations and fatigue tests were performed for variable amplitude(VA), two-step and ten-step loading conditions , both in the low-cycle fatigue (LCF) and high-cycle fatigue ( HCF) range, for the case of C45 steel as an example. Experimental verification of the hypothesis LHSUZ did not revealed any significant influence of load level and form of load spectrum on conformity of results of the calculation by using the LHSUZ, to results of fatigue tests on C45 steel. However, it enabled to assess magnitude of a correction factor which appears in the considered linear hypothesis.

Słowa kluczowe

EN

fatigue life calculations; summation hypothesis of fatigue failures; variable load

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2014
• Tom: nr 3
• Strony: 77--85
• Opis fizyczny: Bibliogr. 8 poz., rys., tab.

Twórcy

autor

Szala G.

• University of Technology and Life Sciences in Bydgoszcz, Faculty of Mechanical Engineering and Mechatronics, 7 Kaliskiego Street, 85-789 Bydgoszcz, Poland

Bibliografia

• 1. Fricke W., Petershagen H., Paetzold H.: Fatigue Strength of Ship Structures, Part I: Basic Principles, Germanischer Lloyd, Hamburg, pp. 34-36, 1997.
• 2. Fricke W., Petershagen H., Paetzold H.: Fatigue Strength of Ship Structures, Part II: Examples. Germanischer Lloyd, Hamburg, pp. 20-21, 1998.
• 3. Polish Register of Shipping (Polski Rejestr Statkow): Fatigue strength analysis of ship steel hull ( in Polish), PRS Publ. No. 45/P, Gdańsk, pp. 35-43, 1998.
• 4. Szala J., Boroński D.: Assessment of state of material fatigue in diagnostics of machines and devices ( in Polish). Publ. Institute of Operation Technology – PIB, Bydgoszcz – Radom, 2008.
• 5. Szala J.: Hypotheses on summation of fatigue failures ( in Polish), ATR Publishers (Wydawnictwa Uczelniane ATR), Bydgoszcz, 1998. This work has been financed by Polish Ministry of Higher Education and Science in the frame of the research project No. 2221/B/T02/2010/39. Acknowledgements
• 6. Kocak M. ( Ed.), Webster S., Janosch J. J., Ainsworth R. A.,Koers R.: FITNET Fitness-for-Service procedure-Final Drift. MK7, 2006.
• 7. Szala G., Ligaj B.: Comparative analysis of fatigue life calculation methods of C45 steel in conditions of variable amplitude loads in the low- and high- cycle fatigue ranges, Polish Maritime Research, No 4(76), Vol 19, 2012.
• 8. Ligaj B.: Influence of selected load programs generated from correlation table, on fatigue life of 18G2A steel (in Polish). Maintenance Problems, 3/2007, Radom, 2007.