This study presents a new criterion (MMFC2) for predicting the forming limit curve (FLC) of sheet metal. The strain path evolution critical element examined in uniaxial tensile test is elaborated by incorporating results experimental measurement, finite simulation, and theoretical prediction via Modified Maximum Force Criterion (MMFC). A scaling factor introduced to mimic evaluation with simula...

superplastic materials show huge amount of deformation in low strain rates and temperature above half of melting point. in superplastic forming, estimating the pressure–time diagram and thickness distribution has significant importance. utilizing numerical methods, the involved parameters in superplastic forming can be optimized for such estimations. in the present paper, the simulation of supe...

The enhanced mechanical properties obtained by refining the grain size down to ultrafine-grained (UFG) regime have attracted considerable attention in recent years. severe plastic deformation (SPD) techniques allow obtaining materials. Different SPD permit processing sheet shape materials such as repetitive corrugation and straightening (RCS) accumulative roll bonding (ARB). In this study, form...

0020-7683/$ see front matter 2010 Elsevier Ltd. A doi:10.1016/j.ijsolstr.2010.07.010 * Corresponding author. Tel.: +1 617 386 3325. E-mail address: [email protected] (M. Luo). Advanced High Strength Steels (AHSS) are increasingly used in automotive industry due to their superior strength and substantial weight advantage. However, their compromised ductility gives rise to numerous manufacturing is...

Abstract The effect of the strain gradient on stretch flange deformation limit steel sheets was investigated by hole expansion tests under various forming conditions and FEM simulations. ratio changed changing initial diameter punch shapes. This study clarified fact that increases, as it does not depend or shape, thus increases. thickness portion could be gradient. These results suggest formabi...

Two-layer metallic sheets have wide applications in aerospace, marine, automotive and domestic industries due to their superlative characteristics. In this paper, the formability of two-layer sheet is investigated through analytical, experimental and numerical approaches. An analytical model is developed based on Marciniak-Kuczynski method associated Hill’s non-quadratic yield criterion. Formin...