Knowledge of: - general methods of design for strength of some of the most important machine components and mechanical systems, with particular reference to the automotive sector, taking into account the different types of applied loads (mission) and their interaction with other parts of the same machine (system); - the behaviour of the threaded joints; - the behaviour of the welded joints; - the behaviour of the torsional and flexural springs; - types and usage of the rolling bearings; - the behaviour and the main properties of the spur gears. Skills: - designing a shaft (or equivalent part) with respect to fatigue; - designing a threaded joint; - designing a welded joint; - designing a torsional or flexural spring; - choosing the required set of rolling bearings for the required loading conditions and life; - designing spur gears.

Engineering drawing, Fundamentals of strength of materials, Applied mechanics, Science and technology of materials or Technology of metallic materials.

Strength of materials: - Recall of the calculation of equivalent stress and possible failure modes - Recall of fatigue strength of materials; factors influencing the fatigue life, fatigue characteristic data and standard diagrams; stress concentration due to notches; load time histories, damage and damage accumulation. - Hertz theory for the calculation of the contact pressure, strength of materials to contact loads and wear problems Mechanical joints: - Threaded joints, axial load and tightening torque, static and fatigue design. - Welded joints: weld types made by arc welding, static and fatigue verification according to the standards, typical defects and evaluation of the weld class. Machine elements and their design: - Rolling bearings: selection in the catalog, equivalent load, life estimation, lubrication, assembly and site preparation; - Mechanical springs: torsion bars, cylindrical helical springs, lamina spring and leaf springs, conical and disc springs; - Notes on friction clutches; - Transmission joints: articulated, universal and homokinetic joints; - Cylindrical spur gears, tooth involute profile, modular geometry, length of the contact path, transmission ratio, specific sliding coefficients, gear tooth bending and surface fatigue failure, criteria for the selection of the module.

The course is organized in theoretical lectures and classroom practices/tutorials. During the tutorials in the classroom, the students will develop exercises on the topics covered during the lectures. Students will also be asked to develop small projects related to motor vehicle components and subsystems, applying in a comprehensive/integrated way some of the methods for design and verification explained during the course.

Lecture slides and course notes will be made available to the students. Even if there is no textbook covering all the subjects developed during the course, the following books are suggested as useful readings: - A.R. Juvinall, K.M. Marshek. "Fundamentals of machine component design", Wiley 1991 - J. Bannantine. "Fundamentals of metal fatigue analysis", Prentice Hall 1990 Further reference books - J.A. Collins. "Failure of materials in mechanical design", Wiley, New York 1993 - Wahl "Mechanical springs", SMI 1963

Lecture slides; Exercises; Video lectures (previous years);

Exam: Written test; Optional oral exam;

The final exam consists in a written part and an elective oral part, both of them take place according to the general procedures defined by Politecnico. The goal of the written part is to check the achievement, by the candidate, of the capability to apply the methods explained in the course to the design of mechanical parts; that of the oral part is to assess the awareness of the candidate about these methods. The written part generally consists in the solution of a set of design and verification problems, similar, as type and difficulty, to those proposed to the students in the tutorials along the semester. During the written exam the students may use, for consultation purpose, books, lecture slides and material of the tutorial on paper (the use of laptops, tablets, smartwatches and any device that can be connected to the web is not permitted). The duration of the written exam is two hours. Booking through the portal is mandatory. The oral part of the exam is devoted to verify the level of knowledge of the Machine Design topics that have been taught during the lectures. The ability of the student to explain from the theoretical viewpoint the asked questions, making use of formulae, diagrams and sketches, is of particular importance. It is also of relevance the ability of the student to describe technical constructive solutions by means of handmade sketches. To pass the written test, the student must obtain a sufficient evaluation in each of the problems that form the test. In order to take the oral exam, the candidate must have passed the written test. The written and oral parts have to be taken in the same exam session. The grade is calculated on a 30 points scale, in case of absence of the oral part it is scaled to a maximum of 24. If the oral part is taken, the final grade is determined as a variation (increment or decrement) starting from the score of the written part (not scaled).

In addition to the message sent by the online system, students with disabilities or Specific Learning Disorders (SLD) are invited to directly inform the professor in charge of the course about the special arrangements for the exam that have been agreed with the Special Needs Unit. The professor has to be informed at least one week before the beginning of the examination session in order to provide students with the most suitable arrangements for each specific type of exam.