EQUIPMENT DESIGN FOR CHEMICAL INDUSTRY

Il corso mira a fornire le competenze di base in analisi strutturale e progettazione, con particolare attenzione ai componenti e strutture chimiche correlate a plants. Gli studenti che superare positivamente un esame dovrebbero essere in grado di valutare, verificare e progettare linee semplici tubazioni, sostenere strutture, recipienti a pressione e i più tipici componenti secondari correlati. Per raggiungere questo obiettivo è essenziale una vasta revisione preliminare dei concetti di base di scienza delle costruzioni.

Frontale

- Prerequisiti come da regolamento del CdS.

- Frequenza obbligatoria

STRESS TENSOR

Stress definition and dimensions, Stress tensor, Invariants, Stress space coordinates, change of physical reference system, principal stresses and directions.

Examples & Exercises.

STRAIN TENSOR

Strain definition and dimensions, Strain tensor, Invariants, dilatational and distortional components.

Examples & Exercises.

STRESS-STRAIN RELATIONSHIPS

Elasticity matrix (vector representation of stress and strain), Yield criteria, basic concepts about plastic response and failure in special cases (uniaxial, torsional stress), path dependence.

Examples & Exercises.

STRUCTURAL PROPERTIES OF AREAS

Beam, Center of mass, Centroid, 1st order (“static”) and 2nd order (“inertia”) sectional moments, Huygens–Steiner theorem.

STATICS OF BEAMS

Definitions, De Saint Venant’s principle, Constraints and DOF, Normal and shear forces, Bending and torsion moments, Equations of statics for single beams, Unstable, Isostatic and Hyperstatic beams, Diagrams of Axial and Shear forces, Diagrams of Bending and torsion moments, Multiple-beams plane structures Truss structures, method of joints, method of sections

STRESSES AND STRAINS WITHIN DEFORMED BEAMS

Tension-compression (stress, strain, deformed shape),

Bending (Navier formula, strains distributions, equation of axis curvature, deformed beam shapes, bending of highly-curved solids), Shear (stress, strain and deformed shape of solid and thin-walled cross sections, shear center), Torsion (stress, strain and deformed shape of solid and thin-walled axisymmetrical cross sections, non-symmetric cross sections, principles about warping).

BUCKLING OF COLUMNS

Euler critical load, eccentric compression, effect of constraints, higher order buckling, membrane buckling, wrinkling.

THERMAL EFFECTS

Relaxation, Creep, viscoelastic response, principal material models

FATIGUE OF MATERIALS

Time dependent loads, difference between fatigue and high strain rate, Wohler curves, uniaxial symmetric, pulsating and intermediate loading histories, Testing methods, basic concepts about multiaxial fatigue.

NOTCH EFFECTS

Shape variations, uniaxial vs-triaxial stress states, geometry-material interaction, notch effect on static and fatigue response, Notch factor curves for main notch shapes

DESIGN OF PIPES, VESSELS AND SUPPORTING STRUCTURES

Biaxial stress states, Thin sheets, Membranal behavior, typical basic configurations of pipes and vessels, positive and negative pressure effects, shape discontinuities, hatches and flange junctions, bolted joining and leakage pressure, supporting structures, internal pressure-induced loads and external loads.

1. SHIGLEY'S MECHANICAL ENGINEERING DESIGN, Richard Budynas, Keith Nisbett, McGraw-Hill;
2. PRESSURE VESSELS, Lecture notes by David Roylance, Department of Materials Science and Engineering, Massachusetts Institute of Technology;
3. SOLID MECHANICS, Lecture notes by Daniela Ciancio, Department of Civil, Environmental and Mining Engineering, University of Western Australia;

- Lecture notes (draft)

- Prova orale;