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Mechanical Behavior of Embossed AA1050-O Sheets Subjected to Tension and Forming
사비르므졸리,Carl Labergere,Marion Martiny,Mohamad Jrad,Guillaume Robin,김흥수,Francois Choquart 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.10
In this paper, experimental characterization of embossed aluminum sheets is performed using extensive mechanical tests. Rotary embossing is performed on these sheets in order to obtain a periodic hill-and-valley structure. The experimental program consists of realizing mechanical tests such as tension, deep drawing, and hydraulic bulge tests using embossed samples in order to build a database that can be used for future finite element modeling tasks. The tensile tests are performed using digital images correlation (DIC) for total displacement measurements and for detailed strain maps. The hydraulic bulge and deep drawing tests are conducted on embossed circular samples to study their formability. A comparison was made with the plane (non-embossed) sheets to explain the contribution of the embossed structure either in both cases of uniaxial and multiaxial loadings.
Kkemais Saanouni,Carl Labergere,Mazen Issa,Alain Rassineux 한국소성가공학회 2010 기타자료 Vol.2010 No.6
This work proposes a complete adaptive numerical methodology which uses ‘advanced’ elastoplastic constitutive equations coupling: thermal effects, large elasto-viscoplasticity with mixed non linear hardening, ductile damage and contact with friction, for 2D machining simulation. Fully coupled (strong coupling) thermo-elasto-viscoplastic-damage constitutive equations based on the state variables under large plastic deformation developed for metal forming simulation are presented. The relevant numerical aspects concerning the local integration scheme as well as the global resolution strategy and the adaptive remeshing facility are briefly discussed. Applications are made to the orthogonal metal cutting by chip formation and segmentation under high velocity. The interactions between hardening, plasticity, ductile damage and thermal effects and their effects on the adiabatic shear band formation including the formation of cracks are investigated.