Numerical Simulation Of Superplastic Forming Research Articles

Numerical Simulation of Superplastic Forming of a Magnesium Alloy Part

A numerical simulation of superplastic backward extrusion of a magnesium alloy part is presented in this paper. In fact, the simulated superplastic forming is not a pure superplastic forming because of the billet with coarse cylindrical grains. The forming may become a pure superplastic forming only after dynamic recrystallization and grain refinement appear and the grain boundary sliding has been the main deformation mechanism. In order to simulate the special forming process, a constitutive relation considering dynamic recrystallization and the multiform deform mechanism and the parameter identification of the constitutive relattion are studied. The program for simulation is able to predict the grain refinement and the transform between different deformation mechanisms. Finally the calculated results on the grain size and dynamic rerystallization are presented. A comparison between the calculated and the experimental results shows there is a good agreement between calculated results and experimental results.

Numerical Simulation of Superplastic Forming and its Microstructure Evolution

Numerical Simulation of Superplastic Forming and its Microstructure Evolution

A coupled thermo-viscoplastic formulation at finite strains for the numerical simulation of superplastic forming

This paper deals with a thermo-elasto-viscoplastic formulation for the simulation of metal forming involving large deformations. The authors present the governing equations of the model and some applications to superplastic forming. The numerical examples illustrate the potentiality of the finite-element code METAFOR based on this formulation.

A Coupled Thermo-Viscoplastic Formulation at Finite Strains for the Numerical Simulation of Superplastic Forming

This paper is concerned with the numerical simulation of hot metal forming, especially superplastic forming. A complete thermo-viscoplastic formulation at finite strains is derived and a unified stress update algorithms for thermo-elastoplastic and thermo-elastoviscoplastic constitutive equations is obtained. The resulting unified implicit algorithm is both efficient and very inexpensive. Finally, numerical simulations of superplastic forming are exposed.

A review of the numerical analysis of superplastic forming

This paper reviews the literature on the numerical simulation of superplastic forming (SPF). After introducing the phenomena of superplasticity and superplastic constitutive equations, non finite element analyses are reviewed. The finite element method of solution to SPF simulation is then examined within the context of the standard flow formulation. However non steady state SPF is not ideally suited to a standard flow formulation and an alternative, incremental flow formulation is discussed.

Pressure-control algorithms for the numerical simulation of superplastic forming

Superplastic forming is a manufacturing process whereby certain materials under the correct conditions of temperature and strain rate exhibit high ductility and can be blow-formed into a die to produce components that are typically very light and strong. It is crucially important, in the process, to be able to control the pressure cycle in order to obtain the optimum strain rate. This paper considers methods for calculating the pressure cycle which may be incorporated into a finite element program for simulating the forming process.