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 relaxation and the concerts of fictive stress for viscoelastic deformation of glass materials around the glass transition temperature is proposed. it expresses 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 fairly well the experimental results of Pd40Ni10Cu30P20 glass alloy, in particular the development of stress-overshoot with increasing strain-rate and lowering temperature, Moreover, this model performs oscillatory behavior (stress-overshoot and -undershoot) which has been observed in many polymer solutions and glass alloy recently observed in stress-strain curves. (C) 2001 Elsevier Science B.V. All rights reserved.