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A Physically-based Constitutive Model for Bcc Crystals with Application to Polycrystalline Tantalum by Sia Nemat-Nasser; Tomoo Okinaka; Luqun Ni is a Engineering article available to read on EtoBox.

What is A Physically-based Constitutive Model for Bcc Crystals with Application to Polycrystalline Tantalum about?

Based on the results of an extensive series of systematic experiments on commercially pure tantalum (bee crystals), a physically-based, rate-and temperature-dependent constitutive model is proposed for bee single crystals and is applied to simulate the experimental results, using the Taylor averaging method. The model calculation is based on a new efficient algorithm for the numerical solution of the finite deformation of bee single crystals, involving up to 48 potentially active slip systems. The accuracy and efficiency of the proposed algorithm are checked through comparison with the results of the conventional explicit Euler timeintegration scheme, using a very large number of timesteps. The model effectively simulates a large body of experimental data, over a broad range of strain rates (IO-'4 x lO"/s), and temperatures (77 to 1300 K), with strains exceeding loo%, using very few adjustable parameters whose values are fixed at the outset for a given material. All other involved constitutive parameters are estimated based on the crystal structure and the physics of plastic flow.

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Author

Sia Nemat-Nasser; Tomoo Okinaka; Luqun Ni

Publisher

Elsevier BV

Published

1998

Language

EN

Field

Engineering (Physical Sciences)