Eventos Anais de eventos
MecSol 2017
6th International Symposium on Solid Mechanics
ON A DUCTILE-CHEMICAL DAMAGE MODEL FOR BIOABSORBABLE POLYMERIC MATERIALS
Submission Author:
Paulo Bastos de Castro , SC
Co-Authors:
Eduardo Fancello
Presenter: Paulo Bastos de Castro
doi://10.26678/ABCM.MecSol2017.MSL17-0057
Abstract
This work describes and evaluates a recently formulated constitutive model for materials with elastic-viscoplastic characteristic response that may undergo plastic-hydrolytic damage. This phenomenological model, which allows for finite kinematics, stands on the framework of variational constitutive updates, having a consistent thermodynamics basis. We focus on the relation between mechanical and chemical phenomena. Despite the complex nature of the processes involved, it is shown the update algorithm follows a simple operational scheme. As engineering materials, to one degree or another, are susceptible to physical and/or chemical degradation, in general, such processes should be prevented or at least predicted in order to determine the lifetime of components and products. Controlled degradation, however, may be desirable when dealing with environmentally-friendly biodegradable materials, or bioabsorbable medical applications. This work aims specially at bioabsorbable materials, which have been used in the production of medical devices (suture anchors, screws, scaffolds, stents etc) employed in trauma and cardiovascular procedures. Some examples demonstrate that the model succeeded in representing the coupling effects of inelastic flow, mechanical and chemical induced damage. Furthermore, a 3D finite element simulation of a stent-like frame highlights the potential usage of this constitutive formulation in the design of new products made of bioabsorbable materials.
Keywords
Variational constitutive updates, viscoplasticity, plastic-hydrolytic damage, Finite Element Analysis
