Enrollment year
2019/2020
Academic discipline
ING-IND/14 (MECHANICAL DESIGN AND MACHINE BUILDING)
Department
DEPARTMENT OF ELECTRICAL,COMPUTER AND BIOMEDICAL ENGINEERING
Course
INDUSTRIAL ENGINEERING
Period
2nd semester (07/03/2022 - 17/06/2022)
Lesson hours
56 lesson hours
Activity type
WRITTEN AND ORAL TEST
Prerequisites
To better attend the classes, the student should have attended the courses of Applied Mechanics, Machine Design, Fundamentals of structural mechanics and got their basic knowledge.
Among them we recall: static equilibrium equations, constraint reactions, internal action diagrams, stress and strain.
Learning outcomes
The course aims to make students acquire the basic skills necessary for the sizing and verification of a mechanical component. At the end of the course, students will be able to describe the diagrams of internal actions in 3D structures, identify the most stressed points, also taking into account the notch effects, and applying the appropriate static and fatigue resistance tests. Students will also be able to size some of the main machine parts.
Course contents
a) Internal actions in 3D structures. Axial force, shear force, bending and twisting moment. Internal action diagrams. Principle of superposition.
b) center of gravity of homogeneous and compound sections, hollow sections. Static area moments, moments of inertia. Transformation of moments of inertia for displacement parallel to barycentric axes. Transformation by rotation with respect to the barycentric axes. Principal axes of inertia. Moments of inertia for rectangular and circular section. Polar moment. Link between barycentric polar moment and axial moments with respect to barycentric axes.
c) Stress and deformation state. Distribution of uniaxial action. Straight flexion. Shear force and twisting moment.
d) Carving effect.
e) Stress components, Mohr circles. Examples of Mohr circles in axial action, bending, torsion.
f) Static (Galileo-Rankine, Guest-Tresca, Von Mises) and fatigue resistance criteria (Haigh diagram, Gough-Pollard criterion).
g) Outline of the sizing of the main machine parts (shafts, bearings, screws, gears, cylindrical helical springs)
Teaching methods
Frontal lessons through which the student learns the main theoretical aspects of the subject.
Exercises aimed at acquiring the skills and methodology necessary for the analysis of the state of stress and the verification of resistance of mechanical components.
Reccomended or required readings
[1] COSTRUZIONE DI MACCHINE
Mc Graw-Hill
a cura della sezione di Costruzione di Macchine del Politecnico di Milano
[2] For further information on the sizing of machine parts:
COSTRUZIONE DI MACCHINE Criteri di base e applicazioni principali, Seconda edizione. Pearson Editore
A. De Paulis, P. Forte, F.Frendo, E. Manfredi
[3] Supplementary notes and exercises are available at https://elearning.unipv.it/course/view.php?id=1198
Assessment methods
The exam consists of a written test (2 hours) and an oral test. The written test, aimed at verifying the skills acquired in the verification of static and fatigue resistance of mechanical components. Only the students who get a positive mark to the written test are admitted to the oral exam, the latter focusing on the entire course program.
The final evaluation is based on the degree of depth and understanding of the topics presented.
Both the written and oral test weights 50% of the final mark, the latter providing an assessment of thirty.
The result of the written test will be communicated via email, as a rule within 7 days from the written test date.
Further information
Supplementary material: https://elearning.unipv.it/course/view.php?id=1198
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