Local-scale analysis of the longitudinal strains in strongly necking materials by means of video-controlled extensometry

Autor:	R Seguela, P Francois, V Gaucher
Rok vydání:	1994
Předmět:	Materials science Ultimate tensile strength Local scale General Materials Science Composite material Condensed Matter Physics Thermoplastic polymer Necking
Zdroj:	Journal of Physics: Condensed Matter. 6:8959-8968
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/6/42/025
Popis:	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.
Databáze:	OpenAIRE
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