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Machine Elements

Code 15265
Year 1
Semester S1
ECTS Credits 6
Workload T(30H)/TP(30H)
Scientific area Mechanics and Thermodynamics
Entry requirements none
Mode of delivery Face-to-face in classroom
Work placements Not applicable
Learning outcomes In this UC it is intended that the student structure the knowledge about the mechanical behaviour of materials, acquire the capacity of analysis and attitude of synthesis of that knowledge directed to design/dimensioning and learn concepts, characteristics and purposes of mechanical elements.
Analyse the mechanical behaviour of materials regarding stress and deformation, elastic and plastic behaviour, constitutive laws and resistance.
Establish concepts, purposes and characteristics of the components of mechanical systems in order to encompass aspects related to the operation, selection, design/dimensioning (static and fatigue), safety and reliability of mechanical equipment.
Design machine elements, supported by a methodology and procedures generally applied in the analysis of machine elements, mechanisms, machinery and structures.
Syllabus 1 - Introduction: Considerations and methodologies concerning mechanical design; Materials used in elements of machines; Ruin of mechanical components and their causes; Codes and standards; Factor of Safety and Design Factor. 2 - Fatigue of mechanical components: Characterization of the process of fatigue failure, Curves of fatigue strength; Methods of project design against fatigue failure. 3 – Shaft design: Fatigue dimensioning; Deformation; critical rotation speed. 4 – Shaft coupling: Interference couplings; Keys, pins and splines. 5 – Shaft supports: contact pressure in simple supports; Bearings selection; Types of bearings. 6 - Threaded Fasteners and Screws: Threads forms; Power screws; Bolted joints; Loading and dimensioning of bolts under tensile, shear and combined loadings; Riveted joints. 7 - Welding: Butt and fillet welds; Stresses in welded joints; Loading and dimensioning of welded joints under tensile, shear and combined loadings. 8 - Springs: Types of springs;
Main Bibliography 1. Required reading:
Aurélio Reis: “Apontamentos de Órgãos de Máquinas”
Joseph E. Shigley, Charles R. Mischke, Richard G. Budynas: “Mechanical Engineering Design”, Mc Graw-Hill
C. Moura Branco, J. Martins Ferreira, J. Domingues da Costa, A. Silva Ribeiro: “Projecto de Órgãos de Máquinas”, Fundação Calouste Gulbenkian
G. Henriot: “Traité Théorique et Pratique des Engrenages”, Dunod
2. Recomended reading
Robert C. Juvinall, Kurt M. Marshek: “Fundamentals of Machine Component Design”, John Wiley & Sons, Inc.
- “DUBBEL – Handbook of Mechanical Engineering”, Springer-Verlag
Gustav Niemann: “Elementos de Máquinas, Vol. I, II e III”, Edgar Blucher Ltda
Robert L. Norton: “Projeto de Máquinas – Uma abordagem integrada”, Artmed Editora S.A.
Teaching Methodologies and Assessment Criteria The teaching methodology in this UC is composed, on one hand, by the exposition of theoretical contents, approached in the theoretical classes, with support of audiovisual resources that are made available to students through Moodle. On the other hand, in practical theoretical classes, exercises related to theoretical matters are carried out, applied to concrete examples of machine elements dimensioning. The exercises are also available to students through Moodle. In parallel to these activities, students are invited to design a mechanism/device where they should apply the dimensioning calculations addressed in the theoretical and theoretical-practical classes, starting by identifying the requirements based on which Identify the various components and calculate their dimensions.
Thus, students will be evaluated through partial tests and a practical design project where they will develop a mechanism using the theory taught in the classroom.
Language Portuguese. Tutorial support is available in English.
Last updated on: 2021-10-01

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