# Machine Elements I

## General characterization

3666

6.0

##### Responsible teacher

Alberto José Antunes Marques Martinho, António José Freire Mourão

Weekly - 5

Total - 76

Português

### Prerequisites

Students must have completed the Engineering Sciences (CE) and Mechanical Engineering (EMc) subjects of the 1st Cycle.

### Bibliography

“Mechanical Engineering Design”, Joseph Edward Shigley & Charles R. Mischke, McGraw-Hill International Editions.
“Órgãos de Máquinas”, Luciano O. Faria, AEIST.
Desenho Técnico”; Veiga da Cunha; Fundação Calouste Gulbenkian.
- A. J. A. M. Martinho, Órgãos de Máquinas I. DEMI - FCT / UNL, 2011 (versão v31)

Available soon

### Evaluation method

The assessment includes tow tests (T1 and T2) and a final exam (E).

Continuous evaluation rating is obtained by the expression:

CC = (T1 + T2) / 2.

The final classification (CF)  is calculated by the expression:

CF = CC se CC >= 9.5  |   CF  =  E  se  CC < 9.5

## Subject matter

2)      Riveted joints: Standards for rivets. Stress distribution in riveted joints. Calculation of riveted joints.

3)      Welding: Critical welded area. Stress distribution in but and fillet welding. Calculation of welded joints. Norris and Salakian diagrams.

4)      Keyed joints: Longitudinal and transverse keys. Free and forced keys. Calculation of keyed joints.

5)      Pins and split pins.

6)      Bonded and soldered joints.

7)      Springs: Typical spring applications. Helical springs for extension and compression. Calculation. Stress distribution and deflection in helical springs. Compression springs stability. Calculation of helical springs for torsion. Stress distribution. Angular deflection and diameter variation. Calculation of Belleville washers. Calculation of volute springs. Calculation of leaf springs.

8)      Clutches and brakes: Calculation of disc and multi-disc clutches and brakes. Cone clutches and brakes. Internal and external expanding clutches and brakes. Oscillating shoes. Pneumatic devices. Band-type clutches and brakes. Lining materials for clutches and brakes.

9)      Belt drives: Calculation of flat-, V- and timing-belts. Belt materials. Influential factors for belt durability.

10)  Shaft couplings: Calculation.

11)  Rolling-contact bearings: Calculation.

## Programs

Programs where the course is taught: