| Code |
15250
|
| Year |
1
|
| Semester |
S1
|
| ECTS Credits |
6
|
| Workload |
T(30H)/TP(30H)
|
| Scientific area |
Mechanics and Thermodynamics
|
|
Entry requirements |
N/A
|
|
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 strength.
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 selection and properties;
Stress and deformation analysis; 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; Stresses and deflections; Design procedure for springs.
|
|
Main Bibliography |
1. Bibliografia principal:
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. Bibliografia complementar
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 sizing.
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.
a) Two partial tests and a practical design project. The final mark is the weighted average of the partial tests and the
design project (40% each test and 20% the design project);
b) Students with a minimum score of 5 values will be admitted to the final exam. In this the practical design project is
not considered for evaluation;
Students will be approved if in a) or b), they obtain a score equal to or greater than 9.5/20 points.
|
|
Language |
Portuguese. Tutorial support is available in English.
|