WSEAS Transactions on Applied and Theoretical Mechanics
Print ISSN: 1991-8747, E-ISSN: 2224-3429
Volume 14, 2019
The Criterion of High-Temperature Creep of Metals based on Relative Changes of Density
Authors: , ,
Abstract: Changes of the porosity and density of various metals and alloys due to the formation and development of micropores and microcracks in the process of high-temperature creep are studied in numerous experiments. Based on these studies the density is considered as integral measure of the structural micro-defects accumulation, and the damage parameter is defined as the ratio of current density to initial density. Taking into account this parameter and the mass conservation law interconnected kinetic equations for creep deformation and damage parameter are formulated. An analytical solution connecting the damage parameter to the value of deformation is obtained. In this case, the creep deformation is calculated approximately. The comparison of theoretical damage and creep curves with corresponding experimental data are given.
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Keywords: High-temperature creep, creep deformation, thermal brittleness, damage parameter, loosening, density changes, long-term strength curves
Pages: 140-144
WSEAS Transactions on Applied and Theoretical Mechanics, ISSN / E-ISSN: 1991-8747 / 2224-3429, Volume 14, 2019, Art. #14