Author(s)

G. Shatil and D.J. Smith

Abstract

A new form of a unified viscoplastic material model based on overs tress was implemented in finite element code using a material constitutive equation programme. The analysis results, employing equivalent forms of the stresses, the overstresses and the inelastic strains, were consistent with results obtained from: (i) uniaxial direct rate dependent integration simulations, (ii) results obtained indirectly by employing experimental stress strain curves and, (iii) experiments. Simulations of two batches of CP (commercial purity) titanium specimens containing cracks subjected to either different displacement rates, or sustained loads (creep) predicted material deformation and failure behaviour that was close to experimental results. However, the simulation results we

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