Advanced

Effects of unloading of multiple necking in tensile bars

Nilsson, Kristina LU (2002) PACAM VII In Applied Mechanics in the Americas 9. p.213-216
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
multiple necking, unloading, J2-flow theory, J2-deformation theory
in
Applied Mechanics in the Americas
editor
Kittl, Pablo; Diaz, Gerardo; Mook, Dean; Geer, James; ; ; and
volume
9
pages
4 pages
publisher
American Academy of Mechanics, Universidad de la Frontera
conference name
PACAM VII
ISSN
1523-2719
language
English
LU publication?
yes
id
c15bd235-b035-4c66-b93b-26759b75fcb9 (old id 776614)
date added to LUP
2008-02-08 09:15:38
date last changed
2016-04-16 05:02:32
@inproceedings{c15bd235-b035-4c66-b93b-26759b75fcb9,
  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.},
  author       = {Nilsson, Kristina},
  booktitle    = {Applied Mechanics in the Americas},
  editor       = {Kittl, Pablo and Diaz, Gerardo and Mook, Dean and Geer, James},
  issn         = {1523-2719},
  keyword      = {multiple necking,unloading,J2-flow theory,J2-deformation theory},
  language     = {eng},
  pages        = {213--216},
  publisher    = {American Academy of Mechanics, Universidad de la Frontera},
  title        = {Effects of unloading of multiple necking in tensile bars},
  volume       = {9},
  year         = {2002},
}