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Актуальные проблемы в машиностроении
. Том 4. № 1. 2017
Материаловедение
в машиностроении
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CREEP AND FATIGUE OF METALS FROM THE STANDPOINT OF THE KINETIC
CONCEPT OF FRACTURE
Petrov M.G.
, Ph.D. (Engineering), Associate Professor, Leading researcher,
e-mail:
markp@risp.ruSiberian Aeronautical Research Institute named after S. A. Chaplygin, 21 Polzunov st.,
Novosibirsk, 630051, Russian Federation
Abstract
The creep of metallic alloys is considered as a thermally activated process. Analysis of test
results that are conducted at various thermo-temporal conditions has revealed physical laws of
deformation and failure which are used then for construction of structural material models. These
models describe amplitude relationships of inelasticity of materials and associate them with a
distribution of internal stresses over volume of solids. They reproduce in calculations micro plastic
strains that initiate the fatigue fracture. Inasmuch as temperature and time appear in the differential
equations of physical kinetics in an explicit form, the problem on prediction of materials longevity
under arbitrary thermally and forced conditions is solved.
Keywords
creep, fatigue, plastic flow, inelastic strains, internal stresses, failure, strength, longevity