CODE 84339 ACADEMIC YEAR 2016/2017 CREDITS 12 cfu anno 3 INGEGNERIA MECCANICA 8784 (L-9) - LANGUAGE Italiano TEACHING LOCATION MODULES Questo insegnamento è composto da: DESIGN OF MACHINE ELEMENTS FUNDAMENTALS OF MACHINE DESIGN AIMS AND CONTENT LEARNING OUTCOMES The course aims to provide students of the knowledge and understanding of the criteria of structural design of the main mechanical members. LEARNING OUTCOMES (FURTHER INFO) The course aims to provide students of the knowledge and understanding of the criteria of structural design (for static strength, in presence of fatigue, against instability) and of the methodologies and instruments for the analysis and structural design of the main mechanical members. Furthermore the course aims to introduce students to product design, with particular reference to the design process and to design for safety, for manufacturability, for cost, for assembly and for environment. TEACHING METHODS Classroom lessons. SYLLABUS/CONTENT 1st part – Fundamentals of machine design Recalls of statics and kinematics of rigid bodies. Tension and strain in solids. Equilibrium of deformable bodies. Loads diagrams. Area of cross sections. Theory of the beams (subjected to tensile, compression, shear, bending, torsion). Effects superposition. Equation of the elastic line. Conventional structural materials (mechanical properties). 2nd part – Criteria of structural design Static strength of materials. Ideal or equivalent stress. Strength criteria for ductile materials. Strength criteria for brittle materials. Safety condition: Limit stress, Safety factor, Admissible stress. Notches and their effect. Elastic and experimental stress concentration factor. Safety condition in presence of notches. Fatigue in metallic materials. Fatigue spectra. High cycle fatigue: Wöhler curves; Influence of the mean stress; Notches and their influence; Size factor; Surface factor. Safety condition for stresses of constant amplitude. Safety condition for stresses of variable amplitude: Cumulative damage. Long columns with central loading. Euler column formula. 3rd part – Design of mechanical elements Connections that cannot be dismantled: Welds. Riveted joints. Glued on joints. Forced connections. Connections that can be dismantled: Threads. Power screws. Threaded connections. Set screws (outlines). Elements for the motion transmission between co-axial members (outlines): Gib-head keys; Woodruff keys; Pins. Mechanical springs. Elements for transmission of power and lifting: Gears. Flexible elements: Belts; Wire ropes; Chains. Members for storage or transfer of energy associated to rotating motion. Brakes. Clutches. Flywheels. Bearings: Rolling contact bearings. Journal bearings. Axles and shafts: Static design. Dynamic design. Crankshafts. 4th part – Elements of product design New approach European Directives (outline). Standards for the safety of machinery: Machinery Directive and Italian D. Lgs. 81/2008. Total Design. Product design specification. Cooperative and Eco-compliant Design. Design for “X” (specifically: Design for manufacturing and for assembly/disassembly). RECOMMENDED READING/BIBLIOGRAPHY Reference books: De Paulis A., Manfredi E., Costruzione di macchine: Criteri di base e applicazioni principali, Pearson Italia - Milano, 2012 Hibbeler R.C., Meccanica dei solidi e delle strutture: teoria ed applicazioni, Pearson Italia - Milano, 2010 Recommended books: Vergani L., Meccanica dei materiali, Mc-Graw Hill Companies, 2006 Nerli G., Costruzione di macchine, Noccioli Editore - Firenze, 2005 Shigley J.E., Progetto e costruzione di macchine, 2a ed., McGraw-Hill, 2009 Chirone, E., Tornincasa, S., Disegno tecnico industriale, Ed. Il Capitello - Torino, 2011 Medri G., Cenni di progettazione di prodotto, Liguori Editore, 2008 TEACHERS AND EXAM BOARD MARGHERITA MONTI Ricevimento: The teacher is available for the students at the end of lessons and by appointment ROBERTO RAZZOLI Ricevimento: The teacher is available for the students at the end of each lesson. Exam Board MARGHERITA MONTI (President) ROBERTO RAZZOLI (President) GIOVANNI BERSELLI FRANCESCO CRENNA LESSONS Class schedule The timetable for this course is available here: Portale EasyAcademy EXAMS EXAM DESCRIPTION Written and oral examination. The written test regards the solution of one exercise. The oral examination consists of two questions on theory. A positive evaluation of the written test is necessary condition to access the oral examination. Exam schedule Data appello Orario Luogo Degree type Note Subject 29/03/2017 09:30 GENOVA Scritto + Orale 06/06/2017 09:30 LA SPEZIA Scritto + Orale 29/06/2017 09:30 LA SPEZIA Scritto + Orale 18/07/2017 09:30 LA SPEZIA Scritto + Orale 12/09/2017 09:30 LA SPEZIA Scritto + Orale 29/03/2017 09:30 GENOVA Scritto + Orale 06/06/2017 09:30 LA SPEZIA Scritto + Orale 29/06/2017 09:30 LA SPEZIA Scritto + Orale 18/07/2017 09:30 LA SPEZIA Scritto + Orale 12/09/2017 09:30 LA SPEZIA Scritto + Orale FURTHER INFORMATION Suggested pre-requisite: Applied Mechanics, Technical Drawing.