Using Contact-less Optical Systems to Characterize and Measure Deformation of TWIP Materials

Abstract

There is evident huge progress in the contact-less systems for measuring deformation by means of the photogrammetry especially during last ten years. From the forming point of view is very important that in many cases photogrammetry can improve knowledge about material deformation behavior under plastic deformation. This paper deals with characterization and description quite special deformation behavior of so-called TWIP (TWinning Induced Plasticity) materials by these contact-less optical systems (in this paper is used system ARAMIS). Beside the revealing deformation behavior there is also effort to find out development of anisotropy during whole static tension test and comparison of results from those measured at deformation values specified by the commonly used standard ČSN ISO 12 275. Other important results can be found during measurement of FLD for TWIP materials according standard ISO 12004-2. There is also possibility to compare values of true strain measured by optical system and results from numeric simulation program – in this case it was widely used simulation program for sheet forming from ESI company (France) PAM-STAMP 2G - comparing of real values of true strain and results from simulation, their mapping and final graphical display of differences between these values.