Stress-strain characteristics under mechanical and thermal loading

• Autorzy: Okrajni J. , Marek A. , Junak G.
• Konferencja: 12th International Scientific Conference CAM3S'2006, 27-30th November 2006, Gliwice-Zakopane
• Języki publikacji: EN

Abstrakty

EN

Purpose: The main problem addressed in the paper is the description of a deformation process under the conditions of mechanical and thermal interactions. Design/methodology/approach: The mathematical modeling has been used to describe the stress-strain behaviour of materials. The method of fatigue testing has been adopted to determine experimentally stress-strain characteristics. The method based on the long term own experience in thermo-mechanical investigations and new European Code-of-Practice for Thermo-Mechanical Fatigue Testing. Findings: An appropriate model description has been developed. Fatigue examinations of the P91 steel that is used in power industry, were carried out. The validation of the model has been performed. So far, experimental verification of the usefulness of the model description to determine the stress-strain characteristics' course for a selected value of the phase shift angle between the temperature and total strain cycles has been made. It has been found that the proposed model reflects the deformation process nature very well in variable temperature, strain and stress conditions. Hence, a conclusion seems to be justified that the approach presented in the paper could constitute the right basis for appropriate constitutive equations, which depict the material behaviour under thermo-mechanical conditions. Research limitations/implications: The developed description should be useful in problems of fatigue behaviour predictions of materials under different mechanical and thermal loadings in industry practical applications and in research problems connected for instance with fatigue life criteria description and validation. Originality/value: The new material characteristics have been shown in the work and the own new method of the material fatigue behaviour prediction. The work is adressed to researches interested in problems of material testing and material behaviour prediction under different loadings that we can meet in the operation practice.

Słowa kluczowe

EN

fatigue; mechanical properties; metallic alloys; applied mechanics

PL

zmęczenie; właściwości mechaniczne; stopy metaliczne; mechanika stosowana

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 20, nr 1-2
• Strony: 271--274
• Opis fizyczny: Bibliogr. 15 poz., rys.

Twórcy

autor

Okrajni J.

autor

Marek A.

autor

Junak G.

• Department of Mechanics of Materials, Silesian University of Technology, ul. Krasińskiego 8, 41-403 Katowice, Poland,

Bibliografia

• [1] J. Bressers, L. Rémy (eds.) Fatigue under Thermal and Mechanical Loading, Kluwer Academic Publishers, Netherlands, 1996.
• [2] P. Hähner et al., Code-of-Practice for Thermo-Mechanical Fatigue Testing, Project funded by the EC under FP5 Growth Programme, GRD2-2000-30014, to be published in Int. J. Fatigue.
• [3] H. Sehitoglu, Thermal and Thermo mechanical Fatigue of Structural Alloys, Fatigue and Fracture, Vol. 19, ASM Handbook, 1996, 527-556.
• [4] H. Kuhn, D. Medlin, ASM Handbook, Mechanical Testing and Evaluation V 8, ASM International, 2000.
• [5] J. Okrajni, K. Mutwil, M. Cieśla, Chemical pipelines material fatigue, Journal of Materials Processing Technology, 164-165 (2005) 897-904.
• [6] J. Okrajni, K. Mutwil, M. Cieśla, Т. Skibński, Durability of the pipelines under mechanical and thermal loading, Energetyka, No. 7, 2003, 447-452 (in Polish).
• [7] J. Dobrzański, The classification method and the technical condition evaluation of the critical elements' material of power boilers in creep service made from the 12Cr-1Mo-V, Journal of Materials Processing Technology, 164-165 (2005) 785-794.
• [8] G.A. Webster, R.A. Ainsworth, High Temperature Сomponent Life Assessment, Chapman & Hall, London, 1994.
• [9] A.J. Fookes, D.J. Smith, Using a strain based failure assessment diagram for creep-brittle materials, in: Proceedings of the Second Int. HIDA Conf., Stuttgart, 2000.
• [10] D.W. Dean, R.A. Ainsworth, S.E. Booyh, Development and use of R5 procedures for the assessment of defects in high temperature plant, in: Proc. of the Second International HIDA Conference, Stuttgart 2000.
• [11] I.A. Shibli, Overview of HIDA Project in: Proceedings of the Second International HIDA Conference, Stuttgart 2000.
• [12] J. Okrajni, Low-cycle fatigue life of creep resistant steels under mechanical and thermal loading, Scientific Notebooks of Silesian University of Technology, 32, Gliwice, 1988 (in Polish).
• [13] J. Okrajni, M. Plaza, Simulation of the fracture process of materials subjected to low-cycle fatigue of mechanical and thermal character, Journal of Material Processing Technology, vol.5 1-2 (1995) 309-318.
• [14] D. Renowicz, A. Hernas, M. Ciśsla, K. Mutwil. Degradation of the cast steel parts working in power plant pipelines, Proc. of the 15th Scientific Int. Conf. AMME'2006, Gliwice-Wisła Vol. 18, Issue 1-2, 2006.
• [15] R.P. Skelton, Loop shape effects during thermo-mechanical fatigue of ferritic steels between 270°C and 570 °C. Proc. CAMP 2002 - High Temperature Fatigue. Biallas G, Maier HJ, Hahn O, Hermann K, Vollersten F, editors ISBN 3-00-114 -009254-4). Paderborn: Bonifiatus GmbH Druck Buch Verlag, 2002, 42-55.