Evaluation of a fatigue cumulative damage in service life prediction

• Autorzy: Čačko J.
• Konferencja: Summer School Of Fracture Mechanics. Current Research On Fatigue And Fracture/sympozjum (VII ; 18-22.06.2001 ; Opole - Pokrzywna, Poland)
• Języki publikacji: EN

Abstrakty

EN

Damage accumulation is evaluated according to a cumulative damage hypothesis, and the residual life is predicted with respect to a fatigue failure criterion. The estimation of cumulative damage under service loading is significantly influenced by a time loading history. The problem of the history effect can be converted to the problem of investigation of equivalent loading with non-zero stress/strain mean value. The conversion method is based in specification of an equivalent amplitude of the harmonic cycle with zero stress and strain mean values. At the same time, a relative damage that is accumulated in the course of equivalent cycle must be the same as the relative damage of actual cycle which has been identified by the rainflow method. The submitted approach enables to utilize the knowledge of cumulative damage process and fatigue behaviour prediction under harmonic loading and to use it for any complex operating loading spectrum. The base of the method and obtained results are presented in the paper.

Słowa kluczowe

EN

fatigue damage; service life prediction; cumulative damage; stress-strain response

• Wydawca: Oficyna Wydawnicza Politechniki Opolskiej
• Czasopismo: Zeszyty Naukowe. Mechanika / Politechnika Opolska
• Rocznik: 2001
• Tom: z. 67
• Strony: 27--46
• Opis fizyczny: Bibliogr. 7 poz., tab., wykr.

Twórcy

autor

Čačko J.

• Institute of Materials and Machine Mechanics Slovak Academy of Sciences, Bratislava

Bibliografia

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• [3] BERGMANN J.W., SEEGER T., On the influence of cyclic stress-strain curves, damage parameters, and various evaluation concepts on the life prediction by the local approach, VDI-Report of progress 18, No 6 (1979) pp. 113-121
• [4] MORROW J.D., Fatigue properties of metals. Fatigue Design Handbook, Warrendale: Society of Automotive Engineers (1968), 44 ps
• [5] CACKO J., Simultaneous computer simulation of operational random processes and continual rainflow counting, Int. J. Fatigue 14, No 3 (1992) pp. 183-188
• [6] CACKO J., Modelling of a fatigue life under operational conditions, Int. Conf. STRUCENG, Paris, 1991, pp. 97-102
• [7] JEELANI S., MUSIAŁ M., A study of cumulative fatigue damage in AISI 4130 steel, J. of Materials Science 21 (1986) pp. 2109-2113