CODE 56643 ACADEMIC YEAR 2022/2023 CREDITS 6 cfu anno 2 INGEGNERIA NAVALE 8738 (LM-34) - GENOVA SCIENTIFIC DISCIPLINARY SECTOR ING-IND/14 LANGUAGE Italian TEACHING LOCATION GENOVA SEMESTER 1° Semester TEACHING MATERIALS AULAWEB OVERVIEW The objective of this course is to provide the concepts, procedures, decision analysis techniques necessary to design machine elemnts commonly found in mechanical and naval devices. AIMS AND CONTENT LEARNING OUTCOMES The aim of this course is to supply overall methods for machine design in reference to static, fatigue strength, and brittle failure AIMS AND LEARNING OUTCOMES The aim is to introduce the student to Machine Design as a branch of Mechanics that tackles structural and resistance problems of mechanical components, focusing on the design of the single machine part and providing hints on the design choices of a machine in its entirety. Attendance to lectures and guided exercises and individual study will allow the student to: learn the general aspects of Machine design with particular reference to structural design criteria for static and fatigue loads, creep and fracture study the solids mechanics basic models and recognize these patterns in machine parts and structures to deal with them through appropriate simplification learn the computation methods of these elements when subjected to static and dynamic loads identify the structural criticalities of the machine parts and outline constructive measures to avoid or at least reduce them master the use of the mechanical characteristics of the materials most used in the mechanical and structural fields, making use of both pre-existing databases and interpretation of experimental results, and simplified methods validated also at a regulatory level achieve a clear vision of the physical aspects of the analyzed structural behaviors understand the reliability of the results obtained with conventional computation methods know how to extend the principles learned to new elements, not covered in the course TEACHING METHODS The lectures and the practical exercise classes, showing real engineering examples, are aimed at showing the ways of simplifying a real object in an appropriate model, for which explicit computations can be carried out through analytical formulas. By consulting appropriate diagrams, the criticalities of the structures, both in the static and dynamic field, are highlighted, taking as case study examples various numerical analyzes on components of mechanical, naval, civil and biomechanical types. In this way, the students are encouraged to learn the skill of extrapolating and generalizing from the specific problem to problems never faced. All the diagrams concerning the mechanical characteristics of the materials are built step by step, starting from real data deriving from experimental tests. SYLLABUS/CONTENT What’s Machine design Materials Static strenth, Plastic deformation, Strength and hardness, Viscoelasticity, Creep and temperature properties Design for static strength Failure of ductile and brittle materials, Stress concentration, Determination of stress concentration factors, Stress concentration charts, Design for static strength with notched elements Design for fatigue strength S-N diagram, High-cycle fatigue, Endurance –limit modifying factors, Stress-concentration effects, Torsion, stress due to combined loading, Cumulative fatigue damage Fracture mechanics Stress state in a crack, SIF, Critical stress-intensity factor, Fracture toughness factors, Fatigue cracks propagation Pressure vessel design Cylindrical and spherical pressure vessels: thick and thin-walled vessel, shrink fits Shafts Flexural vibration, Torsional vibration Weldings design for static and fatigue loads RECOMMENDED READING/BIBLIOGRAPHY J.E. Shigley, “Mechanical Engineering Design”, MCGraw-Hill R.E. Peterson, “Stress Concentration factors”, Wiley-Interscience Publication R.W. Hertzberg, “Deformation and fracture mechanics of engineering materials”, John Wiley & Sons R.C. Juvinall, “ Fundamentals of machine component design”, John Wiley & Sons TEACHERS AND EXAM BOARD MARGHERITA MONTI Ricevimento: The teacher is available for the students at the end of lessons and by appointment (face-to-face or Teams meeting) Exam Board MARGHERITA MONTI (President) GIOVANNI BERSELLI PAOLO SILVESTRI ROBERTO RAZZOLI (President Substitute) LESSONS LESSONS START https://corsi.unige.it/8738/p/studenti-orario Class schedule The timetable for this course is available here: Portale EasyAcademy EXAMS EXAM DESCRIPTION The exam is an oral test, that includes three questions on the topics of Machine Design treated during the frontal lessons. The final mark is given by the average of the marks of the three questions. ASSESSMENT METHODS The oral exam focuses on the topics faced during the lectures and aims to assess to which extent the student: has assimilated an adequate level of knowledge about Structural Mechanics, also with reference to the regulations dealt with has acquired the ability to logically face problems that will be posed during the oral exam can illustrate theories and solve problems uses a methodological approach oriented to analyze the experimental behavior of materials, (static, fatigue, creep, LEFM) with special reference to materials typically used in engineering expresses his thinking clearly uses appropriate terminology Exam schedule Data appello Orario Luogo Degree type Note 11/01/2023 09:00 GENOVA Orale 26/01/2023 09:00 GENOVA Orale 13/02/2023 09:00 GENOVA Orale 12/06/2023 09:00 GENOVA Orale 10/07/2023 09:00 GENOVA Orale 11/09/2023 09:00 GENOVA Orale OpenBadge PRO3 - Soft skills - Sociale base 1 - A PRO3 - Soft skills - Alfabetica base 1 - A