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V. V. Nazarov

ANALYSIS OF TWO CREEP RUPTURE MODELS

DOI: 10.17804/2410-9908.2019.5.073-080

Various invariants of the stress tensor (maximum normal stress, Mises equivalent stress, doubled maximum tangential stress) are considered, as well as their linear combinations with one material parameter, when approximating the experimental creep rupture strength data obtained under a complex stress state. The error of the total discrepancy between the experimental data and the approximating values is always less for linear combinations with the material parameter than for the basic invariants of the stress tensor. This determines the predominant practical use of these linear combinations with the parameter. In this paper, we consider two models for describing the creep-rupture process under a complex stress state. One is a linear combination of the Mises equivalent stress and the maximum normal stress. The other is a linear combination of the doubled maximum tangential stress and the maximum normal stress. The effect of each of the two maximum stresses on the rupture time is established from the analysis of the results of the statistical processing of experimental data obtained under tension and torsion of tubular specimens.

Keywords: creep rupture strength, rupture time, complex stress state, stress tensor invariant

References:

1.  Lokoshchenko A.M., Nazarov V.V. Kinetic approach of investigation of creep-rupture for metals under biaxial tension. Aviatsionno-Kosmicheskaya Tekhnika i Tekhnologiya, 2005, no. 10 (26), pp. 73–79. (In Russian).

2.  Lokoshchenko A.M. and Nazarov V.V. Choice of Long-Term Strength Criteria for Metals in Combined Stress State. Aerospace Engineering and Technology, 2004, no. 7 (15), pp. 124–128. (In Russian).

3.  Lokoshchenko A.M. Estimation of Equivalent Stresses in the Analysis of Long-Term Strength of Metals under Combined Stress State. Mechanics of Solids, 2010, vol. 45, no. 4, pp. 633–647. DOI: 10.3103/S0025654410040126.

4.  Lebedev A.A. The theory of equivalent stresses as a problem of mechanics of materials. Strength of Materials, 1996, vol. 28, no. 2, pp. 94–108. DOI: 10.1007/BF02215833.

5.  Dyson B.F., Mclean D. Creep of Nimonic 80A in torsion and tension. Metal Science, 1977, vol. 11, iss. 2, pp. 37–45. DOI: 10.1179/msc.1977.11.2.37.

6.  Cane B.J. Creep damage accumulation and fracture under multiaxial stresses. In: Proc. 5th Int. Conf. Fract., Cannes, 1981, vol. 3, pp. 1285–93.

7.  Nazarov V.V. Determination of creep properties under tension and torsion of copper tubular specimens. Inorganic Materials, 2014, vol. 50, no. 15, pp. 1514–1515. DOI: 10.1134/S0020168514150138.

8.  Nazarov V.V. Description of Steady Creep under Tension and Torsion of Tubular Samples. Zavodskaya Laboratoriya. Diagnostika Materialov, 2015, vol. 81, no. 7, pp. 60–61. (In Russian).


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Article reference

Nazarov V. V. Analysis of Two Creep Rupture Models // Diagnostics, Resource and Mechanics of materials and structures. - 2019. - Iss. 5. - P. 73-80. -
DOI: 10.17804/2410-9908.2019.5.073-080. -
URL: http://eng.dream-journal.org/issues/content/article_247.html
(accessed: 06/22/2024).

 

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Chief Editor:  S.V. Smirnov
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