Local-scale analysis of the longitudinal strains in strongly necking materials by means of video-controlled extensometry
- 17 October 1994
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 6 (42) , 8959-8968
- https://doi.org/10.1088/0953-8984/6/42/025
Abstract
A novel method of determination of the longitudinal strains at a very local scale in the case of materials that develop a plastic neck under tensile drawing is presented. It relies on the analysis of the distortions of a linear target drawn on a thick thermoplastic polymer film by means of computer-assisted video-controlled extensometry. An equation is given for the target slope as a function of the local principal strains. True-stress and true-strain determinations can be performed along the neck as it forms and propagates. In situ measurements of the volume variations are afforded as a function of strain during the necking process.Keywords
This publication has 10 references indexed in Scilit:
- Crazes and shear bands in semi-crystalline thermoplasticsPublished by Springer Nature ,2005
- Volume strain measurements by optical extensometry: application to the tensile behaviour of RT-PMMAJournal de Physique III, 1994
- Determination of the intrinsic stress/strain equation of thin polymer films from stretching experiments under plane-strain tensionPolymer, 1993
- Video-controlled tensile testing of polymers and metals beyond the necking pointJournal of Materials Science, 1992
- The post-yield behaviour of low-density polyethylenesJournal of Materials Science, 1985
- Effect of stress triaxiality on neck propagation during the tensile stretching of solid polymersJournal of Materials Science, 1983
- Application of the plane simple shear test for determination of the plastic behaviour of solid polymers at large strainsJournal of Materials Science, 1983
- Neck profiles in drawn linear polyethyleneJournal of Materials Science, 1980
- Determination of the plastic behaviour of solid polymers at constant true strain rateJournal of Materials Science, 1979
- The necking and cold-drawing of rigid plasticsPolymer, 1960