Effects of unloading of multiple necking in tensile bars

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Abstract

The distribution of necks in slender structures obtained using high rate deformation often differs from the distribution obtained under quasistatic conditions. Initial thickness imperfections are often used to initiate necking at certain locations along a specimen surface. At sufficiently large deformation rates, necks may develop at sites that correlate weakly or not at all with the sites of the initial thin points. In the present study the time evolution of necks in round tensile bars with initial surface imperfections is visualized for a range of deformation velocities. The purpose of the study is to compare the necking patterns obtained using two different plasicity theories, J2-flow theory and J2-deformation theory. The effects of unloading on multiple necking in tensile bars are of particular interest. In addition, results of simulations near the ideal-plastic limit are presented.
Original languageEnglish
Title of host publicationApplied Mechanics in the Americas
EditorsPablo Kittl, Gerardo Diaz, Dean Mook, James Geer
PublisherAmerican Academy of Mechanics
Pages213-216
Number of pages4
Volume9
Publication statusPublished - 2002
EventPACAM VII - Temuco, Chile
Duration: 2002 Jan 2 → …

Publication series

Name
Volume9
ISSN (Print)1523-2719

Conference

ConferencePACAM VII
Country/TerritoryChile
CityTemuco
Period2002/01/02 → …

Subject classification (UKÄ)

  • Applied Mechanics

Keywords

  • multiple necking
  • unloading
  • J2-flow theory
  • J2-deformation theory

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