A SIMPLE EXTENSION OF LEMAITRE'S ELASTOPLASTIC DAMAGE MODEL TO ACCOUNT FOR HYDROLYTIC DEGRADATION
Keywords:BIOABSORBABLE POLYMERS, ELASTOPLASTIC DAMAGE, HYDROLYTIC DEGRADATION
MOTIVATED BY TECHNOLOGICAL APPLICATION OF BIOABSORBABLE POLYMERIC MATERIALS IN BIOMECHANICS AND MEDICINE, THIS PAPER PRESENTS A SIMPLE BUT EFFICIENT EXTENSION OF LEMAITRE&RSQUO;S ELASTOPLASTIC DAMAGE MODEL BY COUPLING IT WITH A CHEMICAL BASED (HYDROLYSIS) DEGRADATION TERM. THE AIM IS TO ALLOW THE SIMULATION OF DEVICES SUBJECT TO BOTH, MECHANICAL AND CHEMICAL ENVIRONMENTS. THE APPLICABILITY OF THE MODEL IS TESTED BY A SET OF NUMERICAL FINITE ELEMENT BASED EXAMPLES. ENCOURAGING RESULTS SHOW EXPECTED ADEQUATE COUPLING BETWEEN ELASTOPLASTIC AND CHEMICAL DAMAGE. ALTHOUGH THE MODEL IS PRESENTLY RESTRICTED TO LINEAR KINEMATICS, THE BASIC IDEA CAN BE EXTENDED TO FINITE STRAINS.
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