In living organism longterm working implants are subjected to mechanical stresses as well as aggressive body fluids. While aging, they can change their mechanical and biological properties. Investigations presented in this study show the influence of conditions simulating human body on the mechanical properties of biostable (polysulfone) and bioresorbable (poly(lactide-co-glicolide)) polymers and their composites reinforced with medium-modulus carbon fibres. Stability of investigated materials was estimated on the basis creep tests (static load) and under cyclic load.
As a result of creep tests the data enabling to estimate longterm samples behaviour under mechanical tension biological environment were obtained. On the basis of completed experimental data critical force, under which the material can work for long time without failure was determined and the life time for remote load and acceptable deformation of investigated samples was estimated.
As a result of cyclic stress we can observe forming and development of cracks leading to failure. During the analysis of fatigue behavior of composite elements, one fact need to be taken into account, which is their quite different fatigue behavior than that of their components. Hence, carrying out the experiments on the medical device in conditions close to its work environment is very important. Within this study an analysis of fatigue behavior of composite polymer screw was realized. On the basis of chosen micromechanical models a trial of lifetime prediction of joining screws was undertaken (in presumed conditions of simulated body fluid and under cyclic load).

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1. Carbon and polymeric composites modified by nano-hydroxyapatite