Machine Elements

Code:

LEM31128

Sigla:

Áreas Científicas
Classificação	Área Científica
OFICIAL	Solid Mechanics

Ocorrência: 2022/2023 - 1S

Ativa?	Yes
Unidade Responsável:	Departamento de Engenharia Mecânica
Curso/CE Responsável:

Ciclos de Estudo/Cursos

Sigla	Nº de Estudantes	Plano de Estudos	Anos Curriculares	Créditos UCN	Créditos ECTS	Horas de Contacto	Horas Totais
EM	46	Plano de Estudos	3	-	6	60	162

Docência - Responsabilidades

Docente	Responsabilidade
Afonso Manuel da Costa de Sousa Leite

Docência - Horas

Theorethical and Practical :

4,00

Type	Docente	Turmas	Horas
Theorethical and Practical	Totais	1	4,00
Theorethical and Practical	Afonso Manuel da Costa de Sousa Leite		4,00

Língua de trabalho

Portuguese
Obs.: ...

Objetivos

Understand the different of a mechanical engineering design project phases and their interdisciplinarity. Know how to define safety factors. Know the various documents that make up a project. Know the different types of supports and bearings.
Analyze different situations and select supports for different applications. Select, determine the life and design the bearing assembly. Understand the particularities of the design of slip bearings. Design and verify simple components, on yield, with static loading. Determine stress concentration factors. Select and apply failure criteria. Understand the fatigue behavior of materials, namely knowing how to interpret the S-N curve. Design and verify components to fatigue for a given life. Design and verify components to fatigue for failure under complex loads. Design tension bolts. Check bolts to shear failure. Design connecting devices (rivets, pins and keys) for shear and bearing stresses. Dimensioning and verification of weld joints. Adhesive joint design. Select springs. Size and specify springs.

Resultados de aprendizagem e competências

Theoretical-practical classes: method of exposition and interactive demonstration with problem solving. Distributed assessment with final exam. In addition, students will carry out a Project that accompanies the material taught. With the eventual implementation of Distance Learning (EaD), the dynamics of TP classes remains similar to those foreseen for face-to-face teaching, carried out on the Microsoft Teams digital platform.

Modo de trabalho

Presencial

Pré-requisitos (conhecimentos prévios) e co-requisitos (conhecimentos simultâneos)

...

Programa

1 – Introduction to Mechanical Design.
Introductory notes on mechanical engineering design and its phases. Reference to the consideration of aspects such as reliability, economic analysis, availability, security, etc. Security Factors. Regulations, codes and standards. Descriptive memory. Calculation notes and drawings.

2 - Basic Concepts of Material Mechanics (Revisions)

3 – Static Design.
Failure criteria. Ductile failure and brittle failure. Stress concentration. Introduction to fracture mechanics.

4 – Fatigue Design
Fatigue of a material. Variable stresses. Fracture of a material. Fatigue resistance. S-N curves. Fatigue limit correction. Fatigue resistance for variable stresses. Torsion fatigue. Fatigue for combined demands. Accumulated fatigue.

5 – Bearings.
Classification and types of supports and bearings. Selection of supports and bearings. Bearing bearings. Bearing types. Bearing life. Load capacity. Lubrication, sealing and construction details. Slip bearings. Design considerations. Relationship between variables. Gaps. Materials and loadings.

6 – Design of bolts and Other Connection Devices. Bolt standards. Bolts drawing representation. Types of bolts. Spindles. Tension screws. Compression of the connected parts. Joint under external tension. Tightening torque. Static bolt design. Joints. Fatigue of Bolts. Rivets and bolts subjected to shear. Special bolts. Keys, pins and other fasteners.

7 – Design of Welds and Other Types of Connections.
Butt and corner welding. Welding under torsion and bending. Strength of welded joints. Design safety recomendations. Fatigue in welded construction. Resistance welds. Bonding of joints by adhesives.

8 – Spring Design.
Typical spring functions. Spring types. Stresses in tension and compression helical springs. Curvature effect. Deformation of helical springs. Tension and compression springs. Stability. Materials and properties. Critical frequency of springs. Spring fatigue. Torsion helical springs. Blade springs. “Belleville” washers. Various types of springs.

Bibliografia Obrigatória

Rosa Marat-Mendes; Mário Alberto Vieira; Folhas de Apoio à unidade curricular de Elementos de Máquinas I, 2021
Richard G. Budynas, J. Keith Nisbett; Shigley's Mechanical Engineering Design, McGraw Hill
SKF; Catálogo Rolamentos SKF

Bibliografia Complementar

Robert C. Juvinall, Kurt M. Marshek; Fundamentals of Machine Component Design, Willey&Sons
C. Moura Branco, J. Martins Ferreira, J. Domingos da Costa, A. Silva Ribeiro; Projecto de Órgãos de Máquinas, Fundação Calouste Gulbenkian
Arlindo Silva, Carlos Tavares Ribeiro, João Dias, Luís Sousa; Desenho Técnico Moderno, LIDEL
Bernard J. Hamrock, Bo Jacobson, Steven R. Schmid; Fundamentals of Machine Elements, McGraw Hill

Métodos de ensino e atividades de aprendizagem

Theoretical-practical classes are given. After the theoretical exposition of the subject, it is illustrated through application examples. In addition, students will carry out a Design Project to familiarize themselves with the subject taught, and subjects will be discussed during practical classes whenever the teacher deems it necessary. Whenever possible, seminars and study visits will be held with interest in the subject taught.

Software

Ftool
Solidworks
MDS Solids
Ansys

Palavras Chave

Technological sciences > Engineering > Project engineering

Tipo de avaliação

Distributed evaluation without final exam

Componentes de Avaliação

Designation	Peso (%)
Apresentação/discussão de um trabalho científico	40,00
Exame	0,00
Teste	60,00
Total:	100,00

Componentes de Ocupação

Designation	Tempo (Horas)
Elaboração de projeto	15,00
Estudo autónomo	30,00
Frequência das aulas	60,00
Total:	105,00

Obtenção de frequência

...

Fórmula de cálculo da classificação final

The final grade (NF) in the subject is rounded to units, given by:

Mode 1: NF=60%(T1+T2) + 40%(NP)

NP - Project grade
T1 - Grade of the first Test.
T2 - Grade of the second Test.
subject to: (T1+T2)/2 >= 9.5, T1>6, T2>6, NP >= 9,5, NF >= 9.5

The student can recover one of the Tests in the normal assessment period, in particular, on the date of the 1st Exam (EX1), provided that, until the date of the 1st Exam, T1>6 and T2>6.

Mode 2 - NF = 60% Final Exam (EX1 or EX2) + 40%(NP)

NP - Project grade
Subject to: EX1 or EX2 >= 9,5, NP >= 9,5, NF >= 9,5,

Comments: Approval in the discipline requires a minimum grade of 9,5 in the average of the 2 Tests or in the Exams, and a grade greater than 6 values in each of the tests. The Project is mandatory (Pedagogically Fundamental) and will always count 40% of the final grade with the average of the Tests or Exams.

The Project must be handed-in in the stipulated deadline. Failure to meet the project delivery date implies a penalty of 1 value on the note for each day of delay.

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