The Definition of Damage Parameter Changes from the Experimental High-Temperature Creep Curves

A. R. Arutyunyan, R. A. Arutyunyan, R. R. Saitova

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Under the action of relatively low stresses and high temperatures, metallic materials become brittle and fractured with a small value of residual deformations. This problem is known as a problem of thermal brittleness of metals. To solve this challenge in the mechanics of materials the damage conception was introduced. To describe the brittle region of the experimental long-term strength curve, the system of simple kinetic equations for the damage parameter and creep deformation was proposed, and the long-term strength criterion was formulated. In this work, we propose to determine the damage parameter changes according to the experimental high-temperature creep curves. Only one kinetic equation for creep rate for compressible medium, recorded using the damage parameter is formulated. From this equation, the damage parameter is determined, depending on the creep rate and the creep deformation. Similarly, the value of the damage parameter is determined according to the Rabotnov solution. To describe the experimental creep curves various empirical dependences in the form of power, exponential, and mixed functions are used. Theoretical damage curves are plotted. The corresponding theoretical long-term strength curves are constructed.

Original languageEnglish
Title of host publicationAdvanced Problems in Mechanics - Proceedings of the 47th International Summer School-Conference on Advanced Problems in Mechanics, APM 2019
EditorsD.A. Indeitsev, A.M. Krivtsov
PublisherSpringer Nature
Pages53-59
Number of pages7
ISBN (Print)9783030498818
DOIs
StatePublished - 1 Jan 2020
Event14th International Summer School-Conference on Advanced Problems in Mechanics, APM 2019 - St. Petersburg, Russian Federation
Duration: 24 Jun 201929 Jun 2019

Publication series

NameLecture Notes in Mechanical Engineering
ISSN (Print)2195-4356
ISSN (Electronic)2195-4364

Conference

Conference14th International Summer School-Conference on Advanced Problems in Mechanics, APM 2019
CountryRussian Federation
CitySt. Petersburg
Period24/06/1929/06/19

Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Keywords

  • Compressible medium
  • Creep curves
  • Damage parameter
  • Embrittlement
  • High-temperature creep
  • Incompressible medium
  • Kinetic equation for creep rate
  • Long-term strength
  • Rabotvov theory

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