Theory of Viscoelasticity
COURSE CONTENT
General Properties of Plastics – Polymeric Materials. Mechanical properties. Degradation of Properties. Physical Properties of Polymers. Viscoelastic Behavior of Polymers. Short Term Behavior. Experimental Characterization of Viscoelastic Behavior. Isochronous and Isometric diagrams. Recovery of Polymers. Constitutive equations. Design of Polymer structures. Viscoelastic Analysis: Definitions. Materials and Response. Superposition Principle. Linear Viscoelastic Behavior. Laplace Transformations. The Unit Step Function. The Dirac delta function. The Elastic – Viscoelastic Correspondence Principle. Polymer Relaxation. General Constitutive Equation of Linear Viscoelastic Behavior. Exponential Behavior Materials. Dynamic Loading. Viscoelastic Models. Basic Viscoelastic Elements. Complex Viscoelastic Models. Generalized Models. Dynamic Mechanical Behavior. Dynamic Elastic Modulus. Dynamic Shear Modulus. Description of the Dynamic Viscoelastic Behavior through modeling.
LEARNING OUTCOMES
By the term “viscoelastic behavior”, it is meant the simultaneous viscous and elastic behavior of materials, which is manifested by the type of loading, temperature, deformation rate and/or temperature change rate. Students in the frame of this course understand the direct and indirect effect of time and temperature on the behavior of materials as well as the relationship between them through the principle of time-temperature superposition theory. The direct effect of time occurs in simple creep, relaxation, and recovery tests, while the indirect effect of time is manifested by the effect of the rate of deformation and the rate of heating or cooling of the materials. They also understand, apart from the static behavior of materials, their dynamic behavior as a function of either temperature or frequency. All the above are then studied through the development of predictive models of linear viscoelastic behavior while they can compare predicted values with experimental data. Finally, students learn about the limits of application of the linear viscoelastic behavior theory and therefore of the possibility of using the above models as well as they explore the knowledge on the non-linear viscoelastic behavior of polymers and polymeric composites.
Course Features
- Lectures 0
- Quizzes 0
- Skill level All levels
- Language English
- Students 0
- Assessments Self