The effect of thermal setting, solvent type, and concentration on the tensile behavior of electrospun PLGA and polyamide nanofiber yarns simulated with the modified viscoelastic model

In this paper, the stress–strain behavior of polyamide (PA) and poly(lactic- co -glycolic acid) (PLGA) nanofiber yarns was modeled by the modified spring-dashpot Vangheluwe’s model. The modified three-element viscoelastic model was employed to describe the mechanical behavior of the nanofiber yarn subjected to a tensile load. The model was fitted to experimental data by the curve fitting method, and stress–strain curves were simulated for nanofiber yarn with a correlation more than 98%. To validate the model, the obtained data on the tensile properties of nanofiber yarn were investigated. The relationship between theoretical and experimental results showed that the parameters of the model, i.e., spring stiffness and viscosity of dashpot, were related to such mechanical properties of nanofiber yarn as initial modulus and stress.