TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE

Science journal

 
ISSN (print) 2542-2324 /(online) 2618-8244


Articles of The Transactions of KSRC








Cold creep of titanium alloys and its consideration in calculation of hull structure bearing capacity



Full text article ( in russian)

Year

 
2020

Issue

 
391

Volume

 
1

Pages

 
50-63

Caption

 
Cold creep of titanium alloys and its consideration in calculation of hull structure bearing capacity

Authors

 
Mikhailov E., Nigmatullin V., Rybakina O., Strogonova O., Tumashik G.

Keywords

 
cold creep, titanium alloys, bearing capacity, hull structures

DOI

 
10.24937/2542-2324-2020-1-391-50-63

Summary

 
Object and purpose of research. This paper is a review of publications analyzing the effect of time on titanium alloys deformations at room temperature. The first group of these publications studies the cold creep in uniaxial stress state, the second one discusses bearing capacity calculations of hull structures under long-term loads.
Subject matter and methods.A titanium alloy was studied at room temperature. Mechanical behavior of this alloy described in terms of the hardening theory, i.e., in terms of the relations between the stress, residual strain and residual strain rate, which are functions of time. Experimental studies covering a wide range of residual strain rate were conducted. The corresponding characteristics of the material were determined. All tests were carried out on Instron 8800 processor-controlled universal servohydraulic machines.
Main results. This review offers new approach to description of creep in materials. It makes the tests significantly faster, and allows to determine the related parameters with higher accuracy. This paper formulates and summarizes the results concerning loading history effect (including plastic pre-straining of both signs) on the cold-creep behavior of titanium alloys, pure bending of a titanium-alloy strip with anisotropic tension and compression behavior is analyzed in cold creep conditions. These data is used for calculation of hull structure bearing capacity.
Conclusion. The presented results can significantly reduce the time of titanium-alloy tests. A set of methods for calculation of shell bearing capacity under long-term loading is developed.

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