Mechanical Engineering Design I

Mechanical Engineering
5.5 ECTS; 3º Ano, 1º Semestre, 30,0 T + 30,0 TP + 4,50 OT

Lecturer
- Jorge Manuel Afonso Antunes

Prerequisites
A pass in previous modules: Physical; Applied Mechanics; Mechanics of Materials

Objectives
The students should learn the basic concepts:
of failures resulting from static and variable loading; of lubrification and wear. And be able to design of mechanical elements as welding, brazing, bonding, screws, fasteners, mechanical springs shafts and axles.

Program
1. Fatigue project. Prevention to Fatigue:
1.1. Characterization of the fatigue process
1.2. Fatigue stress cycles and its fundamental parameters
1.3. Characterization of fatigue strength curves
1.4. Behavior parameters to fatigue
1.5. General methods of design and design fatigue
1.6. Fatigue analysis range of variable load
1.7. Cracking fatigue life; Application of Fracture Mechanics
2. shafts and shaft couplings:
2.1. Design of shafts for static charges
2.2. Sizing shafts fatigue
2.3. Concentration voltages
2.4. Sizing shafts to deformation
2.5. Materials used in veins
2.6. Braces
2.7. Union shafts
3. Welded:
3.1. Types of joints
3.2. Static calculation of welded joints
3.3. Sizing fatigue of welded structures
4. Bolts and fastening devices:
4.1. Types of threads
4.2. Types of screws
4.3. Requests and design
4.4. Screws with preload
4.5. Calculation of subjects screws eccentric loads
5. Springs:
5.1. Torsion bars
5.2. Stresses and deformations in helical springs tension and compression
5.3. Materials for springs
5.4. Types of coils
5.5. Sizing fatigue of coil springs
5.6. Leaf springs
6. Lubrication and Wear:
6.1. Wear of Materials
6.2. Types of Lubricating
6.3. Viscosity
6.4. Law Petroff; Stable lubrication
6.5. Lubricants

Evaluation Methodology
Students are assessed through written exams in one of the three instituion evaluation periods. The written test will have a minimum of 9.5 for approval.

Bibliography
- Mischke, C. e Shigley, J. (2013). Mechanical Engineering Design. (Vol. 1). (pp. 1-1248). EUA: McGraw-Hill

Method of interaction
Presentation of key theoretical concepts. Theoretical/practical classes including case study discussions.

Software used in class
PowerPoint.