Models for Predicting the Long-Term Strength of Rheonomic Materials
Iskakbayev A. Teltayev B. Rossi C.O. Aitbayev Y. Zhaisanbayev A.
October 2025Multidisciplinary Digital Publishing Institute (MDPI)
Applied Sciences (Switzerland)
2025#15Issue 20
Reliable modeling and prediction of the long-term strength of materials are relevant, as they allow for accurate determination of the service life of structures and components made from these materials. The aim of this work is to develop models of the long-term strength of rheonomic materials under constant stress and step loading using the principle of damage accumulation, as well as a model for predicting their long-term strength under constant stress based on short-term test data. Using the developed models, the long-term strength of optical fiber with a moisture of 30% and 85% under constant stress from 1600 to 2100 MPa and aluminum alloy under a step change of stress at a temperature of 180 °C were predicted with high accuracy; the long-term strength of pearlitic steel was predicted based on short-term tests under constant stress at temperatures from 98 °C to 293 °C. The developed models have important practical significance, as they can be used for modeling and predicting the long-term strength of rheonomic materials in practice, particularly in cases where the conditions of their operation and loading history are known.
long-term strength , models , principle of damage accumulation , rheonomic materials
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U. Joldasbekov Institute of Mechanics and Engineering, Almaty, 050010, Kazakhstan
Department of Mechanics, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Department of Chemistry and Chemical Technologies, University of Calabria, Rende, 87036, Italy
LLP “Road Research and Production Center”, Almaty, 050064, Kazakhstan
U. Joldasbekov Institute of Mechanics and Engineering
Department of Mechanics
Department of Chemistry and Chemical Technologies
LLP “Road Research and Production Center”
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