ASSESSMENT OF THE SERVICE LIFE OF STRUCTURAL STEELS BY USING DEGRADATION MODELS WITH ALLOWANCE FOR FATIGUE AND CREEP OF THE MATERIAL
I. A. Volkov1, V. V. Egunov2, L. A. Igumnov2, D. A. Kazakov2, Yu. G. Korotkikh1, F. M. Mitenkov3
1Volga State University of Water Transport, Nizhny Novgorod, 603950 Russia
pmptmvgavt@yandex.ru
2Research Institute for Mechanics, Nizhny Novgorod, 603022 Russia
vegunov@mech.unn.ru
3Afrikantov Experimental Design Bureau for Mechanical Engineering, Nizhny Novgorod, 603074 Russia
MitenkovFM@gmail.com
Keywords: пластичность, ползучесть, малоцикловая усталость, долговечность, механика поврежденной среды, базовый эксперимент, материальные параметры, поврежденность, разрушение, plasticity, creep, low-cycle fatigue, service life, damaged medium mechanics, basic experiment, material parameters, damage, fracture
Abstract
A mathematical model is developed within the framework of equations of damaged medium mechanics to describe the processes of viscoplastic straining and damage accumulation in structural steels with allowance for fatigue and creep of the material. A model of damage summation due to interaction of low-cycle fatigue and creep of the material is proposed. Material parameters and scalar functions of equations of mechanics of damaged media are determined. Viscoplastic straining and fatigue-induced damage accumulation in 08Kh18N10T and 12Kh18N9 are studied numerically, and the data obtained are compared with available results of physical experiments.
|
