Ductile fracture of notched aluminum alloy specimens under elevated temperature P. 2 Numerical modelling and fracture criterion

Łukasz Derpeński , Andrzej Seweryn

Abstract

Paper presents the results of the numerical modelling of axisymmetric specimens with circumferential notchesmade of aluminum alloy EN-AW 2024 T3 under elevated temperature. A range of notch rood radii (rK= 0.5, 2,4, 8, 30 mm) is considered. The specimens underwent monotonic uniaxial loading at elevated temperature 20,100, 200 and 300 °C. Stress and strainfields in whole specimens were calculated usingfinite element analysis(FEM). Axisymmetricfinite element mesh model built of four-node elements with a bilinear shape function wasused in simulations. The aim of these calculations were to determine the location of maximum stress and plasticstrain in the specimen depending on the notch radius and the elevated temperature. Significant attention waspaid to influence on distributions of stresses and plastic strains under uniaxial loading, elevated temperature andnotch radius. It has been shown that the location of maximum stresses and plastic strains depends only on thenotch radius where their value depends both on the notch radius and on the temperature. The main aim of theseresearch was to develop new ductile fracture criterion for notched specimens taking into account elevatedtemperature and uniaxial loading. In this criterion assumed that the fracture initiation occurs when the normalstress on this physical plane reaches the critical value, depending on the isotropic damage state variableω,generated by plasticflow of the material (depending on the temperature).
Author Łukasz Derpeński (FME / DMACS)
Łukasz Derpeński,,
- Department of Mechanics and Applied Computer Science
, Andrzej Seweryn (FME / DMACS)
Andrzej Seweryn,,
- Department of Mechanics and Applied Computer Science
Journal seriesTheoretical and Applied Fracture Mechanics, ISSN 0167-8442, e-ISSN 1872-7638, (N/A 100 pkt)
Issue year2019
Vol102
Pages83-97
Publication size in sheets0.7
Keywords in Englishductile fracture, elevated temperature, specimen with notches, uniaxial loading, fracture criterion, aluminum alloy
ASJC Classification2210 Mechanical Engineering; 2500 General Materials Science; 2604 Applied Mathematics; 3104 Condensed Matter Physics
DOIDOI:10.1016/j.tafmec.2019.01.023
Internal identifierROC 19-20
Languageen angielski
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 12-02-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.466; WoS Impact Factor: 2018 = 2.848 (2) - 2018=2.934 (5)
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