Mechanical Behaviour of Materials

Code:

L.EMAT020

Acronym:

CMM

Keywords
Classification	Keyword
OFICIAL	Science and Technology of Materials

Instance: 2024/2025 - 2S

Active?	Yes
Responsible unit:	Metallurgy, Materials and Technological Processes Section
Course/CS Responsible:	Bachelor in Materials Engineering

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
L.EMAT	25	Syllabus	2	-	6	52	162

Teaching language

Portuguese

Objectives

Justification:
The crystalline structure of a material influences decisively the generality of the properties of importance to an engineer. Understand how the structure influences the mechanical response is essential to tailor the mechanical properties of a material to the demands that their use requires. The Mechanical Behavior of Materials course emphasizes the relationship between the structure of materials and its mechanical behavior. Students will learn how engineering materials, with a focus on metallic materials, respond to mechanical loads in both a macroscopic and microscopic view.

Objectives:
This course aims to cover the mechanical behaviour of materials, by giving an emphasis to:
(1) the introduction of the concepts of defect, in particular the linear ones, and set its effects on physical and mechanical properties of materials;
(2) the description of the physical mechanisms and/or mechanical behaviour of monocrystals and polycrystals under plastic deformation;
(3) the influence of recovery and recrystallization on mechanical behaviour of materials.

The engineering knowledge acquired in this course unit will be integrated in the planning and development of laboratory assignments. They will be group assignments, so that students can develop their interpersonal, cooperation and communication skills.

Learning outcomes and competences

By the end of this curricular unit, students should be able to:
Know the stress-strain relationship and how it is used to describe the mechanical behavior of materials;
Describe how macroscopic properties, and behavior, are related to structural defects;
Know the crystalline defects of materials: point, linear and surface;
Describe different type of dislocations motion, splitting into partial dislocations, the elastic stress fields around dislocations and Frank-Read sources.
Understand plastic deformation mechanisms by dislocations motion and their interactions;
Know how to control the microstructure using plastic deformation and annealing;
Know and use materials testing techniques, tensile tests and hardness, accordingly to standards;
Have the skills to design and conduct experiments, as well as to analyze and interpret data;
Demonstrate writing and oral communication skills.

Working method

Presencial

Pre-requirements (prior knowledge) and co-requirements (common knowledge)

The basic knowledge of science and engineering of materials and the familiarity with testing and material characterization techniques are essential to student performance in theoretical and laboratory components.

Program

States of stress, mechanical characteristics and mechanical tests (tension, compression, bending, twisting and cutting).
Crystal imperfections: points, lines and surfaces.
Dislocations: characteristics and properties of dislocations; motion, reaction and intersection of dislocations; dynamics of dislocations and vacancies. Interaction between dislocations. Sessile dislocations. Dislocations and plastic deformation; strain hardening.
Surface defects: stacking faults, small and wide-angle grain boundaries, twins.
Plastic deformation of monocrystals and polycrystals: mechanical behavior and physical mechanisms of deformation; deformation models of polycrystals; dislocation structures.
Restoration, recrystallization and grain growth.

Mandatory literature

Thomas H. Courtney; Mechanical behavior of materials. ISBN: 0-07-116171-6
Smallman, R. E.; Modern Physical Metallurgy. ISBN: 0-408-71051-9

Complementary Bibliography

Verlinden, B., Driver, J., Samajdar, I., Doherty, R. D. ; Thermo-Mechanical Processing of Metallic Materials, Pergamon Materials Science., 2007. ISBN: 978-0-08-044497-0

Comments from the literature

In addition to the indicated bibliography, it will be placed in the contents of the course a set of presentations prepared by the teacher.

 

Teaching methods and learning activities

Theoretical-practical classes are based on the presentation of the themes of the course unit, followed by discussion, presentation and resolution of practical cases. Students deepen their knowledge through problem solving and case studies discussion proposed during classes.
In laboratory classes, students develop a project work correlated with the studied contents. The assignments will be carried out during practical classes, and students have to write a technical-scientific report and give an oral presentation supported by multimedia equipment and it will take place a discussion afterwards.

keywords

Technological sciences > Engineering > Materials engineering
Technological sciences > Technology > Materials technology
Physical sciences > Physics > Condensed matter properties > Mechanical and thermal properties

Evaluation Type

Distributed evaluation with final exam

Assessment Components

Designation	Weight (%)
Apresentação/discussão de um trabalho científico	6,00
Exame	50,00
Teste	10,00
Trabalho prático ou de projeto	34,00
Total:	100,00

Amount of time allocated to each course unit

Designation	Time (hours)
Apresentação/discussão de um trabalho científico	10,00
Elaboração de projeto	15,00
Estudo autónomo	56,00
Frequência das aulas	56,00
Trabalho de investigação	10,00
Trabalho laboratorial	15,00
Total:	162,00

Eligibility for exams

Class attendance will be recorded and students are expected to attend all laboratory classes; students cannot miss more than 25% of the laboratory classes. Students have to reach a minimum of 10 points grade in the practical component (on a scale between 0 and 20 points).

Calculation formula of final grade

The assessment is based on the grades of exercises solved in class (10%), of the laboratory work, including written report, oral presentation and discussion of the results (40%), and the exam (50%).

The practical component grade is determined as follows: Ncl = (0,85 x Nre + 0,15 x Nap) x Cd

Ncl = Practical component grade
Nre = Written report grade
Nap = Oral presentation and discussion grade
Cd = performance factor measuring the compliance to practical classes regulations as well as work groups performance (between 0,5 and 1,0)

Examinations or Special Assignments

Not applicable.

Special assessment (TE, DA, ...)

Students have to attend practical classes and reach a passing grade in the practical component. At the special season of exams, the theoretical-practical component will be assessed based on a final exam, while the practical component on the preparation, execution, and discussion of the laboratory assignment. At the normal season, they will be assessed as regular students. Final Grade = Exam or Tests (60%) + Practical assignments (40%)

Classification improvement

Students can only improve the practical component in the following year, because they have to attend classes and be assessed yet again. However, they can improve the grade of the theoretical-practical component by attending an exam at the special season of exams.