Mechanical Structures

Basic knowledge of Applied Mechanics and Strength of Materials.

The teaching method involves an expository component and the use of real elements, both in the laboratory and in the field, to be explored by the students. The perception of the teaching typology can be divided into several points:

Expository Approach: In the theoretical and theoretical-practical component of the course, several methodologies will be used, including the expository method. In parallel with the acquisition of theoretical knowledge, application examples will be performed, favoring the exchange of ideas, with an approach to solving problems by the students themselves.

Experimental Component: The experimental connection of theoretical concepts and analytical resolution will be developed, in parallel, during the laboratory classes, with direct intervention by the students through the execution of experimental works that involve the identification and study of structural elements of real use in the field of engineering.

Teamwork and cooperation: The work to be carried out in a team of two students aims to stimulate the ability to work together, sharing information, tasks, and results applied to the basic concepts described.

Oral communication: The oral presentation of the works intends to develop the ability to transmit information and ideas to other people, in formal environments, promoting the discussion, always in an interconnected way with the analysis debate to the mechanical behavior of the structural elements that integrate the component under study.

Making things happen, responsibility and autonomy: It is also an objective to promote the ability to always achieve what it proposes, knowing how to manage activities of analysis of structural elements, resources, and implementation timings, solving problems autonomously and responsibly, with a high critical spirit, making decisions based on scientific and technological knowledge acquired during classes.

The Mechanical Structures course unit consists of three components: theoretical, theoretical-practical, and laboratory, which are interconnected. In the theoretical and theoretical-practical components, it is intended that the student acquires scientific knowledge that allows him to understand the approach to problems involving structural elements, using analytical methods and data obtained experimentally.

In the laboratory component, real structural elements are used, which are used in people’s daily lives, for an effective understanding of the contents. This learning includes the acquisition of knowledge in the experimental application of extensometry techniques and the use of load cells and displacement sensors.

It is also intended that the student acquires behavioral skills (personal and interpersonal) by applying the technical-professional concepts learned in the development of various works throughout the course.

1. Reviews: Unit systems. Concept and types of force, stress and strain. Structural element shapes. Hypotheses and steps in the analysis of a structure. Design principles. Standardization applicable to mechanical structures and their importance. Combined solicitations. Analysis of structural elements subjected to combined solicitations.

2. Torsion: Torsion of elements with non-circular section. Torsion on Thin Wall profiles: Open and Closed. Multicellular profiles.

3. Stress and strain analysis: Stress Plane State. Main Stresses and Maximum Shear Stress. Mohr’s circle. Generalized Hooke’s law. Strain plane state. Applications of the plane stress state: Stresses in Reservoirs Under Pressure. Study of mechanical structures subjected to combined solicitations. Structural design according to Tresca and von-Mises criteria.

4. Energetic Methods: General equation of the deformation potential energy. Castigliano’s theorem. Determination of displacements and rotations in structures. Calculation of displacements in hyperstatic structures. Study of structures subjected to to impact loads.

5. Experimental stress analysis: Basic concepts and principles of operation. Types of strain gauges. Extensometric Rosette. Specifications and selection of strain gauges. Gluing and assembly techniques for strain gauges. Application examples.

6. Buckling: Stability of Structures. Euler’s formula for articulated columns. Generalization of the Euler formula. Eccentric Loads. Application examples.

NAO

Bibliografia Recomendada:

[1] GERE & TIMOSHENKO, (1997), Mechanics of Materials, (4ª Edição), Hardcover .

[2] BEER, F. et al.,(2009), Mechanics of materials, (5th edition). Boston: McGraw-Hill Heigher Education (disponível na Biblioteca do ISEC: 4-15-114)

[3] HIBBELER, R.C. (2014), Mechanics of Materials, (Ninth Edition), Pearson, cop.

[4] BEER, F. P., JOHNSTON, E.R. (1995);  Resistência dos Materiais (4ª edição) McGraw Hill

[5] TIMOTHY, A. P. (2014), Mechanics of Materials, (3th edition), Singapore: Wiley, cop.

[6] ANTUNES, F. (2012), Mecânica Aplicada – Uma Abordagem Prática. Lidel