DiPForm

Division of Plastic Forming

Main areas of current research

> Computer methods for nonlinear numerical simulations
– development of in-house finite element codes and tailored subroutines to model nonlinear behaviors: material, geometric and contact nonlinearities
– implementation of nonlinear algorithms: return mapping strategies, arc-length control, development of contact and friction procedures, etc
– development of user subroutines (user materials and user elements) for commercial finite element codes

> Finite element technology
– development of plane stress enhanced strain shell elements
– development of hexahedral enhanced strain solid-shell finite elements for sheet forming applications
– development of alternative formulations for distinct locking pathologies

> Phenomenological constitutive laws (yield functions)
– implementation of anisotropic yield functions for numerical simulation of sheet metal forming processes, including Barlat’s yield functions: Yld91 (plane stress and full three-dimensional analysis), Yld96 and Yld2000 (plane stress conditions) and Yld2004-13p and Yld2004-18p for full three-dimensional analysis
– development of multi-stage return mapping procedures, semi-implicit and fully implicit, for special non-quadratic yield functions;

> Polycrystal plasticity
– research and implementation of micro/meso scale polycrystalline models, as an alternative to conventional phenomenological approaches at macro-scale level
–  derivation of yield conditions at continuum level, using texture as input at grain level (meso-scale) and multiscale models, naturally including anisotropic effects via texture evolution description
– inclusion of thermal effects, by means of strain rate-dependent crystal models

> Structural stability
– analysis and simulation of thin-walled structures, under complex compressive (buckling) loads
– analysis and simulation of friction stir welded thin-walled panels, under complex compressive (buckling) loads
– dynamic and impact analysis and numerical simulation

> Simulation of forming processes
– sheet metal forming analysis and simulation
– tubular and sheet hydroforming processes
– bulk forming
– tubular hydroforming of dissimilar tailor welded components (distinct thickness and materials)
– prediction and characterization of common structural defects in sheet metal formed products: springback (tension instabilities), wrinkling (compression instabilities) and fracture
– optimization of tools and initial blank geometries, coupled with numerical simulation for minimization of defects in the final components
– incremental sheet forming (http://spifaproject.wix.com/spifa)

> Experimental Sheet Forming
– Incremental Sheet Forming: Lab equipped with a high payload prototype ready to produce parts using this die-less process
– Analysis of formability and springback
– Material Testing

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