Effects of unloading of multiple necking in tensile bars
Author
Editor
- 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.
Department/s
Publishing year
2002
Language
English
Pages
213-216
Publication/Series
Applied Mechanics in the Americas
Volume
9
Document type
Conference paper
Publisher
American Academy of Mechanics
Topic
- Applied Mechanics
Keywords
- 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/Other
- ISSN: 1523-2719