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Effects of unloading of multiple necking in tensile bars

In English

Författare

Redaktör

  • Pablo Kittl
  • Gerardo Diaz
  • Dean Mook
  • James Geer

Summary, in English

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.

Avdelning/ar

Publiceringsår

2002

Språk

Engelska

Sidor

213-216

Publikation/Tidskrift/Serie

Applied Mechanics in the Americas

Volym

9

Dokumenttyp

Konferensbidrag

Förlag

American Academy of Mechanics

Ämne

  • Applied Mechanics

Nyckelord

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

Conference name

PACAM VII

Conference date

2002-01-02

Conference place

Temuco, Chile

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1523-2719