Materials Selection

Code:

EM0077

Acronym:

SM

Keywords
Classification	Keyword
OFICIAL	Manufacturing and Automotive Engineering

Instance: 2007/2008 - 1S

Active?	Yes
Responsible unit:	Materials and Technological Processes Group
Course/CS Responsible:	Master in Mechanical Engineering

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
MIEM	14	Syllabus since 2006/2007	5	-	6	70	160

Teaching language

Portuguese

Objectives

Study, using case-studies, materials selection methodologies and choice of processes by which the material is to be formed, joined and finished.
It is expected the students will be able to use significant mechanical properties of different materials in comparing and materials selection exercises.
It is expected also that the students will be able to:
- Use and model complex mechanical behaviour such toughness, fatigue and creep.
- Choose a specific combination of properties that are important for each case study and find materials with an adequate property profile.
- Discuss alternative solutions for different families of materials and associate possible manufacturing processes for components in discussion.

Program

1- Families of engineering materials. Advantages and limitations of each group.
2- Definition of material properties. Material properties charts. Use of searchable database of material datasheets.
3- Mechanical Behaviour: rigidity, mechanical resistance, ductility, resilience and toughness. Fatigue and Creep. Other properties: thermal, optical, electrical and eco-properties.
4- Modulus-density charts and strength-density charts. Relative costs by weight and volume. Costs for equal rigidity and equal strength.
5- Ferrous alloys. Steels and cast irons. Selection of constructional steels based upon mechanical resistance, ductility and toughness. Importance of carbon and alloy contents in selection.
6- Non-Ferrous alloys. Aluminium alloys. Main types and heat treatments. Copper alloys. Main properties of copper-zinc and copper-tin alloys. Titanium alloys. Main types and properties.
7- Polymers. . Main commercial types for thermoplastics, thermosets and elastomers. Advantages and limitations of polymeric based composites.
8- Processes and process selection. Compatibility between materials and processes. Limitations for shape, section thickness, tolerances and surface roughness. Cost modelling. Materials, capital, time, energy and information as inputs of cost models.
9- Use of material indices in material selection
10- Materials and the environment. The material life-cycle. Material and energy-consuming systems. The eco-attributes of materials: production processing and end of life phases.
11- Case studies. Materials and manufacturing process selection and discussion for bicycle frames.

Mandatory literature

Ashby, Michael F.; Materials selection in mechanical design. ISBN: 0-7506-6168-2
Ashby, Mike; Materials and design. ISBN: 0-7506-5554-2

Complementary Bibliography

Askeland, Donald R.; The science and engineering of materials. ISBN: 0-534-55396-6
Smith, William F.; Principios de ciência e engenharia dos materiais. ISBN: 972-8298-68-4

Teaching methods and learning activities

Mechanical behaviour of materials, main groups of materials with their advantages and limitations and methodologies for materials selection, are presented in theoretical classes. In practical classes case studies are discussed involving materials and processes selection.

keywords

Technological sciences > Engineering > Mechanical engineering

Evaluation Type

Distributed evaluation with final exam

Assessment Components

Description	Type	Time (hours)	Weight (%)	End date
Subject Classes	Participação presencial	40,00
Case study analysis	Teste	60,00		2007-12-14
Case study reports	Trabalho escrito	58,00		2007-12-14
Exam	Exame	4,00		2008-01-25
Exam	Exame	4,00		2008-01-25
	Total:	-	0,00

Eligibility for exams

The student must attend 75% of classes and report and discuss a pre-determined case-study.

Calculation formula of final grade

Case-Study (50%) + final exam (50%)

Special assessment (TE, DA, ...)

Final Exam (100%)

Classification improvement

Final exam