PublicaciĂłn: ANALYTICAL AND NUMERICAL ANALYSES OF A VISCOUS STRAIN GRADIENT PROBLEM INVOLVING TYPE II THERMOELASTICITY
Fecha
2024
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AIMS MATHEMATICS
Resumen
IN THIS PAPER, A THERMOELASTIC PROBLEM INVOLVING A VISCOUS STRAIN GRADIENT BEAM IS CONSIDERED FROM THE ANALYTICAL AND NUMERICAL POINTS OF VIEW. THE SO-CALLED TYPE II THERMAL LAW IS USED TO MODEL THE HEAT CONDUCTION AND TWO POSSIBLE DISSIPATION MECHANISMS ARE INTRODUCED IN THE MECHANICAL PART, WHICH IS CONSIDERED FOR THE FIRST TIME WITHIN STRAIN GRADIENT THEORY. AN EXISTENCE AND UNIQUENESS RESULT IS PROVED BY USING SEMIGROUP ARGUMENTS, AND THE EXPONENTIAL ENERGY DECAY IS OBTAINED. THE LACK OF DIFFERENTIABILITY FOR THE SEMIGROUP OF CONTRACTIONS IS ALSO SHOWN. THEN, FULLY DISCRETE APPROXIMATIONS ARE INTRODUCED BY USING THE FINITE ELEMENT METHOD AND THE BACKWARD TIME SCHEME, FOR WHICH A DEMONSTRATE THE ACCURACY OF THE APPROXIMATIONS AND THE BEHAVIOR OF THE DISCRETE ENERGY DECAY.
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viscoelasticity, type II thermoelasticity, strain gradient, finite elements, existence and uniqueness, a priori error analysis
