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Scheda Riassuntiva
Anno Accademico 2014/2015
Scuola Scuola di Ingegneria Industriale e dell'Informazione
Insegnamento 095841 - MACHINE DESIGN 2
Docente Beretta Stefano
Cfu 10.00 Tipo insegnamento Monodisciplinare

Corso di Studi Codice Piano di Studio preventivamente approvato Da (compreso) A (escluso) Insegnamento
Ing Ind - Inf (Mag.)(ord. 270) - BV (430) INGEGNERIA MECCANICA* LZZZZ082937 - COSTRUZIONE DI MACCHINE 2
Ing Ind - Inf (Mag.)(ord. 270) - BV (483) MECHANICAL ENGINEERING - INGEGNERIA MECCANICA* LZZZZ095841 - MACHINE DESIGN 2
Ing Ind - Inf (Mag.)(ord. 270) - MI (424) INGEGNERIA NUCLEARE* LZZZZ095841 - MACHINE DESIGN 2

Programma dettagliato e risultati di apprendimento attesi

The main objective of the course is to provide the students with the necessary design tools for the design and assessment of machine parts, both under static and fatigue loading. The basics of mechanical design are upgraded in order to include advanced theory of elasticity, finite element analysis, design methods for static and fatigue loads (multiaxial and variable amplitude loading) and tools for assessing the influence of defects on static and fatigue strength. Theory of elasticity is extended in order to make it possible to evaluate stresses in typical mechanical parts like pressure vessels, springs, bolted and welded junctions, power transmission shafts, and validate finite element analyses.

 

 

 

Subjects description

Structural Analysis.

  • Statically undetermined systems: Force Method
  • Theory of Plates and Shells: Circular Plates, Cylindrical Shells
  • Axissimmetric problems: Thin and Thick Cylinders loaded by internal and external pressure and centrifugal loads.

 

Strength of materials and assessment criteria

 

  • 3D state of stress, multiaxial failure theories
  • Cyclic response of materials: High Cycle Fatigue. Endurance limit, Fatigue strength, Modifying factors, Stress       Concentration and Notch Sensitivity, Multiaxial Fatigue, Variable Amplitude loading, Cumulative Fatigue damage, Low Cycle Fatigue
  • Linear Elastic Fracture Mechanics: energy approach (Griffith), Stress Intensity Factor, KIC, Crack Propagation

 

Design of Machine Elements

  • Mechanical Springs. Helical Springs. Leaf springs
  • Shaft and Shaft Components. Materials, layout, design for stress, deflections, critical speeds, components, fits.
  • Screw, Fasteners, and the Design of Nonpermanent Joints. Standards, Mechanics of Screws, Joint Diagram, Bolt Strength. Static and Fatigue Loading of Joints
  • Welding and the Design of Permanent Joints. Stresses in Welded Joints, Strength of Welded Joints.
  • Pressure vessels. Bolts and gasket, Joint Analysis, Flanges, Flat Ends, Semispherical Ends, Secondary Stresses.

Case Studies

Power Transmission Case Study. General Analysis, Design of Shafts, Bearings, Shrink Fits, Gears Forces, Fatigue Assessment

Pressure Vessel Case Study. Design of Bolts, Shells, Flanges, and Flat Ends. Validation of Analytical Methods by Means of FEM analysis and Lab Tests.

 

Information resources and literature

[1] J.E. Shigley et Al.: Mechanical Engineering Design, McGraw-Hill, 9th Edition, 2011

[2] N. E. Dowling Mechanical Behavior of Materials, 4/E, Prentice Hall, 2013

[3] Lecture notes by the teacher

 

Recommended prerequisites

Mechanics of Structures and Basic Machine Design

 


Note Sulla Modalità di valutazione

The exam includes a written test and an oral one, both or them are compulsory and cover the full program of the course.

Attendance to the lessons and laboratory is not compulsory.


Bibliografia

Mix Forme Didattiche
Tipo Forma Didattica Ore didattiche
lezione
54.0
esercitazione
36.0
laboratorio informatico
23.0
laboratorio sperimentale
4.0
progetto
0.0
laboratorio di progetto
0.0

Informazioni in lingua inglese a supporto dell'internazionalizzazione
Insegnamento erogato in lingua Inglese
schedaincarico v. 1.6.1 / 1.6.1
Area Servizi ICT
28/02/2020