Methods of Modeling and Computer-Aided Prediction of Relaxation of Medical-Purpose Textile Elastomers

Advances in Raw Material Industries for Sustainable Development Goals

“…The decomposition of the total deformation value into the corresponding three parts is considered to be a difficult task due to their simultaneous occurrence and further develop ment. Information about the complex pattern of distribution of material particles over relax ation and delay times can be obtained only through a physically-based analytical description of polymeric materials rheology in combination with the measurement of various deformation processes (Pereborova et al, 2020c). The accumulated experience of working with polymeric materials shows that the viscoelastic and plastic components of their deformation depend in a certain way on the level of applied mechanical action (Pereborova et al, 2020d).…”

“…The application of modelling for an accurate quantitative description of deformation or relaxation in the study of the properties of poly mers encounters certain difficulties (Pereborova et al, 2020b). Different operational behaviour of polymers, structural changes during deformation depending on the sample background, temperature, duration of action, and stress-strain values, make it difficult to obtain the exact rheological characteristics of the process (Pereborova et al, 2020c). However, the relevance of modelling for a qualitative or approximate quantitative description of mechanical properties is obvious.…”

“…The need to use a ring R means that most of the natural phenomena around us are some 0 ordered chains of certain events (Pereborova et al, 2020c).…”

Systematic Analysis of the Deformational Properties of Polypropylene and Polyvinylidene Fluoride Surgical Materials

“…To perform their intended function, mesh endoprostheses should have suitable deformational and strength properties. A necessary condition is limited stretching of the mesh, i.e., the elastic component of deformation of the endoprosthesis due to intraabdominal pressure should be only moderate [5][6][7].…”

“…The characteristics of the fabric elasticity were determined from the stress-strain diagrams of the mesh fabrics obtained at sufficiently rapid stretching rates as in the case of the threads. Since the deformation of a mesh endoprostheses should not exceed 30% [5], the initial deformation segment (0 ≤ ε ≤ 30%) is the most important part of the entire deformation region of the stress-strain diagrams of mesh fabrics. Figures 3 and 4 give the initial segments of the stressstrain diagrams for PP and PVDF meshes in two directions.…”