An Improved Strain Hardening Characterization in the Adina Code Using the Mechanical Sublayer Model.

Abstract : The Besseling-White sublayer model for simulating the nonlinear strain hardening behavior of plastically deforming solids has been implemented in the ADINA finite element computer program as an additional material option. The Besseling-White model, also called the mechanical sublayer model, simulates strain hardening behavior by superposing the stresses from an array of elastic- perfectly plastic elements, called sublayers. Sublayer properties are determined from a polygonal fit to the stress-strain curve. This new material option has been validated by comparing predictions using this model and the two linear hardening models (kinematic and isotropic) presently in the standard version of ADINA. Comparison of predictions for the transverse deflection history of an impulsively loaded clamped-edge circular plate shows a close correlation between the sublayer model and the kinematic hardening model and a somewhat poorer, but still reasonable, correlation between the sublayer model and the isotropic hardening model.