Modeling of stress-strain curves for Pd40Ni10Cu30P20 glass alloy under constant strain-rate deformation

A model which is based on the hypothesis of stress-induced structural relax ation and the concerts of fictive stress for viscoelastic deformation of gl ass materials around the glass transition temperature is proposed. it expre sses both linear and non-linear viscoelastic behaviors. For constant strain -rate deformation, it performs the stress-overshoot phenomenon observed in the condition of non-Newtonian flow. The model calculation reproduces fairl y well the experimental results of Pd40Ni10Cu30P20 glass alloy, in particul ar the development of stress-overshoot with increasing strain-rate and lowe ring temperature, Moreover, this model performs oscillatory behavior (stres s-overshoot and -undershoot) which has been observed in many polymer soluti ons and glass alloy recently observed in stress-strain curves. (C) 2001 Els evier Science B.V. All rights reserved.