Strength of Materials

Students begin by drawing diagrams of axial and transverse forces, bending moments in beams or bars subjected to concentrated loads, distributed loads and bending moments. They determine the geometric center, the moment of inertia and static moment in cross sections. They are taught the concepts and equations of fundamental strength of materials, allowing calculate stresses and deformations in structures of simple metallic components. The know of tensile strength of a material and the safety factor are presented in order to calculated the permissible stress of a component made by this material. The study of structural elements subjected to axial loads, torsional moments and bending moments with the support of graphical and analytical tools are taught, complemented with theoretical and practical
exercises of practical engineering problems arranged in order of increasing difficulty. This study is strongly supported by practical work performed in class laboratory.

Exame final na forma de prova escrita para a totalidade dos alunos, estruturado numa parte teórica e numa teórica -prática (resolução de casos), cuja a cotação atribuída é de 15 valores, devendo os alunos obterem um mínimo de 50% nesta parte para obterem aprovação na disciplina, e numa parte prática de resolução de trabalhos sugeridos nas aulas de laboratório, acompanhados de relatório(s) pormenorizado(s) segundo o modelo disponibilizado no moodle, os quais são apresentados e discutidos na última semana de aulas, valendo 5 valores. Estes relatórios só são válidos para as épocas normal e de recurso e são considerados apenas para os alunos que frequentem pelo menos 75% das aulas práticas (laboratório). Caso o aluno desista dos trabalhos durante as aulas terá avaliação de 0 valores nos exames das épocas normal e de recurso. Para os alunos que não frequentem as aulas de laboratório, e como tal não
apresentem o(s) referido(s) relatório(s), o exame final é cotado para 20 valores.

The strength of materials discipline study the behavior of structural elements used in the fields of mechanical engineering and metal taking into account the conditions of their use and the stresses to which they are subject. Obtain the more convenient shape and dimensions of materials to be used, which offers better performance, to withstand various types of external stresses applied to machines, parts of structures, etc … at the lowest possible cost and maximum safety. The strength of materials discipline must define clearly and precisely what is required to the student as a future engineer
Skills: Understanding the concepts and procedures involved in selecting and sizing machines bodies and structural elements.
Know and use measurement instrumentation and control.
Learn to design mechanical components and reticulated structures

Static: internal and external loads, reticulated and truss structures, Ritter method. Efforts: normal, transverse, bending and torsional moments. ;Strength of materials: Normal stress, shear stress, displacement, strain, mechanical properties; elasticity and plasticity, Hooke’s law, stress-deformation diagrams for ductile and brittle materials, safety coefficient, yield criteria.;Structural elements subjected to axial loading Stress into bars axially loading. Saint-Venant principle. Bars elongation. Influence of temperature on elongation of the bars.;Structural elements subjected to torsional moment Pure shear. Torsion on elements with circular and non-circular cross section. Torsion in thin-walled open sections and in thin -closed sections. Power transmission. ;Study of structural elements subjected to bending Bending of beams straight axis: pure, shear and axial and bending. Bending combined with axial load. Bending combined with torsion. Shear stresses in bending.

NAO