Mechanical Behavior of Materials

Recommended Prerequisites

Materials Science and Engineering, Strength of Materials I, Elasticity and Plasticity.

Teaching Methods

The lectures are designed for the presentation and development of the topics that correspond to the course syllabus. During practical classes the concepts taught in lectures are applied to real problems. During practical classes the student has an active participation suggesting strategies for solving the problems posed. Some classes are intended for laboratory demonstration of mechanical tests described in the program.

Learning Outcomes

It is intended to give for the students the technical and scientific knowledge about the actual mechanical behavior of materials including: elastic and plastic deformation, the brittle and ductile fracture, fatigue and also the interaction of materials with the environment, including creep behavior. Also a summary approach of fracture and fatigue in composite materials is given. Transmitted knowledge are the  required for the design of components of medium complexity and subject to static and fatigue loadings. Students should acquire the skills to understand the phenomena described and to act independently in activities of quality control, design and materials selection, critical analysis of defective parts and maintenance.

Work Placement(s)

No

Syllabus

Introduction: elastic and plastic deformation, brittle fracture. Static design: Criteria for resistance. Admissible stress. Stress concentration. Fracture of Materials: Griffith theory. Stress intensity factor. Plasticization at the crack tip. Concept of KIC. Residual strength curves and their applications. Concepts of CTOD and Integral J. Applications of elastoplastic fracture mechanics. Tests of fracture. Interlaminar fracture in composites. Fatigue of Materials: Characterization of the process. S-N curves. Low cycle fatigue. Parameters of fatigue. Fatigue design. Crack propagation: Curves da/dN-  K; parameters of propagation. Applications da/dN- K curves. Fatigue damage in composite materials and main parameters. Stress corrosion: Curves stress - rupture time. Curves da/dt-K. Applications of the curve of da/dt-K. Creep: Concept and creep tests. Analysis of components with long lives. Stress relaxation and recovery. Stresses and strains on bars in bending.

Head Lecturer(s)

Diogo Mariano Simoes Neto

Assessment Methods

Assessment
Evaluation by midterm exam and exam.: 100.0%

Bibliography

C.M. Branco, J.A.M. Ferreira, J.D.M. Costa e A. Ribeiro “Projecto de Orgãos de Máquinas”, Ed. Fundação C. Gulbenkian, 2005.

Broeck, D., Elementary Engineering Fracture Mechanics, Ed. Noordhoff, Holanda, 1974.

Hertzberg, R.W., Deformatio and of Fracture Mechanics of Engineering Materials, Ed. John Wiley Sons, London, 1979.

Rolfe and Barsom, Fracture and Fatigue Control in Structures. Applications of Fracture Mechanics, Ed. Prentice-Hall, 1977.

Barthélémy, B., Notions Practiques de Mécanique de la Rupture, Ed. Eyrolles, 1980.

Branco, C.M., Mecânica dos Materiais, Fundação Calouste Gulbenkian, 3ª Edição, 1998.

J. R. Shigley, C. R. Mischke, “Mechanical Engineering Design”, McGraw-Hill International Edition, 1989.

Rooke, D.P., Cartwright, D.J., Compendium of Stress Intensity Factors, Here Majesty´s Stationery Office, London, 1976.