Mechanical Structures

Strength of Materials.

The lecture method is used in the theoretical component of the course. Following the acquisition of theoretical knowledge, some application examples of structures observed in real context are then studied, privileging the exchange of ideas and problem-solving approach by the students during the lessons. Both cases have complementary viewing/using of computer programs. The concepts are cemented during the laboratory classes with the implementation of several experimental examples. The class is divided into groups of three students, and beyond the execution of the experimental work, they develop many works that aim to deepen the skills regarding the application of the concepts described and the ability to work in teams. The evaluation of the course is taken through a final written exam (60%) and based on the work performed, which are delivered to teacher in the form of report and target a presentation and discussion (40%).

The curricular unit consists of three interconnected components: theoretical, theoretical/practical and laboratory work. Is intended that students acquire knowledge in the theoretical and theoretical/practical parts that enable them to understand the approach to problems involving several mechanical structures applying analytical and numerical methods. Some experimental procedures are used for testing these structures in laboratory conditions, particularly in the context of experimental stress analysis. This includes acquire skills in the experimental application of the strain gages methodology and the use of load cells and displacement sensors to study the structures behavior. Students should acquire competences by applying the learned concepts in the development of several practical works during the course and through the completion of a final project.

Reviews: Systems of units. The concept of force, stress and strain. Typical geometry of structural elements. Hypotheses and steps in the study and analysis of a structure. Principles of project and structural verification. Standardization applicable to mechanical structures.
Extensometry: Basic concepts and principles of operation. Types of strain gages. Specifications and selection. Techniques used to install strain gauges. Application examples.
Combined Solicitations: Study of mechanical structures subjected to combined loads. Application examples. Reticulated systems: Study and design of 2D reticulated systems. 3D Reticulated Systems. Application examples.
Buckling: Stability of mechanical structures. Euler formula for columns. Generalization. Hexcentric loads. Project and verification of columns.
Energy and Impact: Energy methods and statically indeterminate structures. Strain energy. Impact loads. Work and energy. Theorem of Castigliano. Statically indeterminate structures.

NAO