Temperature and strain rate influence on AA5086 Forming Limit Curves: experimental results and discussion on the validity of the M-K model - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue International Journal of Mechanical Sciences Année : 2014

Temperature and strain rate influence on AA5086 Forming Limit Curves: experimental results and discussion on the validity of the M-K model

Résumé

Due to the high-strength to weigh ratio, corrosion resistance, good workability and weldability characteristics, aluminium alloys are increasingly used in many sectors. Researches on formability of aluminium alloy sheets have always been a hot topic these last years while very few works taking into both temperature and strain rate effects on formability limits can be found in the literature. In this study, the formability of sheet metal AA5086 is investigated at different temperatures (20, 150 and 200°C) and strain rates (0.02, 0.2 and 2 s-1) through a Marciniak test setup. Experimental results show that the formability of AA5086 increases with temperature and decreases with forming speed. Based on the analytical M-K theory, a Finite Element (FE) M-K model is proposed to predict the Forming Limit Curves (FLCs). A modified Ludwick hardening law with temperature and strain rate functions is proposed to describe the thermo-elasto-viscoplastic behavior of the material. The influence of the initial imperfection (f0) sensitivity in the FE M-K model is discussed and a strategy to calibrate f0 is proposed. The agreement between experimental and numerical FLCs indicates that the FE M-K model can be an effective model for predicting sheet metal formability under different operating conditions if the initial imperfection value is calibrated for each forming condition.
Fichier principal
Vignette du fichier
Temperature_and_strain_rate_influence_on_AA5086_Forming_Limit_Curves.pdf (856.98 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00917253 , version 1 (25-02-2014)

Identifiants

Citer

Xingrong Chu, Lionel Leotoing, Dominique Guines, Eric Ragneau. Temperature and strain rate influence on AA5086 Forming Limit Curves: experimental results and discussion on the validity of the M-K model. International Journal of Mechanical Sciences, 2014, 78, pp.27-34. ⟨10.1016/j.ijmecsci.2013.11.002⟩. ⟨hal-00917253⟩
166 Consultations
653 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More