A Model for Plastic-Hydrolytic Damage Bioresorbable Polymer Composites

Abstract

This paper explains and assesses a recently developed constitutive model for elastic-damage that may sustain plastic-hydrolytic damage. When a metallic material is subjected to plastic strain, voids and microcracks in the metal matrix start to form, develop, and merge. This is what causes ductility
degradation in metals. Only a few of the many models that have been presented to depict ductile failure have done a thorough analysis of the entire damage buildup process, instead focusing on the ultimate failure circumstances. The purpose of this study is to review experimental methods created by several authors to quantify the buildup of ductility degradation under tensile forces. This phenomenology model, which supports finite kinematics, is based on variational constitutive updates, and has a coherent thermodynamics foundation. The connection between mechanical and chemical events is the main topic of our attention. It is demonstrated that the updating algorithm has a straightforward operational structure despite the complexity of the processes involved. Engineering materials can degrade physically and/or chemically to varying degrees, so it is important to prevent
or at least predict these processes in order to estimate how long components and products will last. The use of environmentally benign biodegradable materials or bioabsorbable medical applications,
however, may necessitate controlled disintegration. The focus of this work is specifically on bioabsorbable materials that have been used to create medical devices such as scaffolds, stents, screws, suture anchors, and screws used in cardiovascular and trauma operations. The model's
ability to accurately depict the combination of things of elastoplastic flow, mechanical injury, and chemical damage is shown by a few examples. The potential application of this constitutive formulation in the design of novel goods comprised of bioabsorbable materials is further highlighted
by a three-dimensional finite element simulation of a stent-like frame.