Mathematical Modeling of Relaxation and Creep for Medical-Grade Polymer Yarns

We have studied the deformation properties of medical-grade polymer yarns (categorized as viscoelastic solids) in the region of action of nondestructive loads close to their usage conditions, based on a mathematical model of the deformation processes. Advances in methods for theoretical prediction of the stress–strain state of the indicated materials can be attributed to their expanding application. Development of procedures for calculation of deformation processes in the studied materials is inseparably connected with solving problems of comparative analysis of their deformation properties, with studies of the correlation between properties and structure, with targeted processing control of properties, and also with prediction of short-term and long-term mechanical effects.