L'insegnamento prevede 2.0 CFU erogati con Didattica Innovativa come segue:
Blended Learning & Flipped Classroom
Corso di Studi
Codice Piano di Studio preventivamente approvato
Ing Ind - Inf (Mag.)(ord. 270) - MI (491) MATERIALS ENGINEERING AND NANOTECHNOLOGY - INGEGNERIA DEI MATERIALI E DELLE NANOTECNOLOGIE
053368 - POLYMERS AND COMPOSITES FAILURE AND DURABILITY
052517 - MECHANICAL BEHAVIOUR AND DURABILITY OF POLYMERS
096275 - MECHANICAL BEHAVIOUR AND DURABILITY OF POLYMERS
053369 - VISCOELASTIC BEHAVIOUR OF POLYMERS
The course aims to introduce basic and advanced concepts necessary for understanding the structure-property correlations of polymeric materials and composites for engineering applications. The analysis is carried out starting from the linear behavior (liquid and solid state) and time dependent (viscoelasticity) and then passing to the durability examination intended as the beginning of irreversible phenomena that lead to the degradation of the structure and performance of materials. They include the yield, fracture and phenomena of change of the chemical structure (eg degradation by exposure to sunlight) and physics of materials.
Risultati di apprendimento attesi
The student: - knows and understands the structure-property correlations of polymers and composites and their appropriate use in the design of processes and products for Materials Engineering and Nanotechnologies; - knows how to make choices related to the dimensioning of components and the use of materials in relation to the specific use of the product; - autonomously carries out insights on topics related to the course to solve simple design problems.
INTRODUCTION The engineering use of polymeric materials: processing and applications. Rheological properties and solid state properties. Limitations of the traditional concept of property (‘single point data’) and advanced (‘integral’) concept. Constitutive relations and their role in engineering problems. Intrinsic material properties Examples of constitutive relations used in polymer rheology and mechanics.
RECALL of basic concepts and definitions in SOLID and FLUID MECHANICS
POLYMER RHEOLOGY Rheological constitutive equations for polymers: classification. Non-Newtonian shear behaviour of polymeric fluids. Dynamic viscosity. Fluodynamics and the role of rheological costitutive equations in fluodynamical problems. Example: analysis of the flow in a pipe.
PROPERTY-to-STRUCTURE RELATIONSHIPS in POLYMER RHEOLOGY Shear viscosity-to-structure relationships in polymers. Shear viscosity dependence on temperature and pressure.
POLYMER VISCOELASTICITY Material's fading memory: ‘functional’ dependence of material's response on stimulus' past history. Behaviour of polymers under ‘simple’ histories of the mechanical stimulus: Energetical consequences of the viscoelastic behaviour. The theory of linear viscoelasticity. I. Boltzmann’s superposition postulate. The theory of linear viscoelasticity. II. Analogue models.
THERMO- and PIEZO-VISCOELASTICITY General temperature dependence of viscoelasticity. Linear theory of thermo-viscoelasticity: time-temperature ‘equivalence’. Master curves and shift factor. Arrhenius’ and Williams-Landel-Ferry’s shift factors.Piezo-viscoelasticity: time-pressure ‘equivalence’.
PROPERTY-to-STRUCTURE RELATIONSHIPS in POLYMER VISCOELASTICITY Thermo-mechanical Spectrometry (time/rate/frequency or temperature scans)
VOLUMETRIC BEHAVIOUR OF POLYMERS Equation of state (PVT) and deviation from equilibrium: time-dependence of volumetric transformations. Kinetical nature of the glass transition. Doolittle’s experiment and the the concept of ‘free volume’. Derivation of WLF’s shift factor from Doolittle’s equation. Volumetric or ‘dilatational’ viscoelasticity (PVT-t). Effect of ‘dilatational’ viscoelasticity on ‘distorsional’ viscoelasticity.- POLYMER AND COMPOSITES AGEING AND DEGRADATION: chemical and physical mechanisms and their consequences on structure and properties
YIELD AND FRACTURE OF POLYMERS AND COMPOSITES: mechanisms, theories and effects of time-dependent behaviour
PREDICTION OF LIFETIME: accelerated testing, theoretical modeling and case histories
PREVENTIVE MEASURES: additives, coatings, etc.
Basic knowledge of chemistry, physics and analysis
Knowledge of mechanics of materials
Modalità di valutazione
The evaluation of the student is based on the following methods:
- participation in blended learning activities and learning verification tests
- final written test consisting of both open-ended questions and the resolution of design problems
The final mark is established on the basis of passing the written test, while the assessment of the learning tests constitutes an increase of that grade in the range from 0 to +2.
Course notes and other reading materialhttps://beep.metid.polimi.itH.A.Barnes, Handbook of Elementary Rheology, Editore: Wales Univ. Press, Anno edizione: 2000, ISBN: 0-9538032-0-1
S.Middleman, The Flow of High Polymers, Editore: Interscience, Anno edizione: 1968
D.J.William, Polymer Science and Engineering, Editore: Prentice-Hall, Anno edizione: 1971
N.G. McCrum, C.P. Buckley and C.B. Bucknall, Principles of Polymer Engineering, Editore: Oxford Univ Press, Anno edizione: 1997
H.F.Brinson and L.C.Brinson, Polymer Engineering Science and Viscoelasticity. An Introduction, Editore: Springer, Anno edizione: 2008
C.W.Macosko, Rheology. Principles, Measurements and Applications, Editore: N.Y. VCH Publ., Anno edizione: 1994
J.D. Ferry, Viscoelastic Properties of Polymers (2nd Edition), Editore: John Wiley & Sons, Anno edizione: 1969
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