Abstract
We consider the results of known tests of tubular specimens under a constant axial stress and a constant or alternating tangential stress. The cyclic variation in the sign of the tangential stresses significantly increases the time to fracture.
The modeling of long-term strength of metals in unsteady complex stress states encounters significant difficulties. The application of the kinetic theory of long-term strength is apparently the most promising method for solving this problem. As a rule, the use of a scalar damage parameter does not permit describing the specific characteristics of fracture for various loading programs. The use of a tensor damage parameter also encounters difficulties because of a large number of functions and material constants contained in the kinetic equations. In this paper, we propose to use a vector damage parameter to describe the experimental data under study.
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Original Russian Text © A.M. Lokoshchenko, 2016, published in Izvestiya Akademii Nauk, Mekhanika Tverdogo Tela, 2016, No. 3, pp. 93–99.
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Lokoshchenko, A.M. Use of a vector damage parameter in modeling of long-term strength of metals. Mech. Solids 51, 315–320 (2016). https://doi.org/10.3103/S0025654416030080
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DOI: https://doi.org/10.3103/S0025654416030080