Ing Ind - Inf (Mag.)(ord. 270) - BV (483) MECHANICAL ENGINEERING - INGEGNERIA MECCANICA
097500 - LIGHTWEIGHT DESIGN OF MECHANICAL STRUCTURES
The main objective of the course is lightweight design. Students will gain competencies on design methods and modelling tools (mainly using the Finite Element Method) for structures and components to be designed to achieve minimum mass while satisfying performance requirements (usually stiffness and strength), with special focus on design with composite materials.
Risultati di apprendimento attesi
Lecture and classwork aim at developping the following skills:
- acquisition of knowledge of the principles of lightweight design, with focus on modelling the mechanical behaviour of composite structures
- to solve structural optimization problems autonomously, applying concepts of other disciplines (e.g. solid mechanics, vibrations, mechaincal behaviour of materials)
- to design a simple lighweight structure
- to communicate results in an effective and technically correct manner.
Lightweight design (16 h lesson, 12 h exercise).
Introduction, types of structures, material selection, joining techniques
Optimization: introduction, criteria and algorithms; examples and exercises. Optimization of simple mechanical structures.
Design and Analysis of lightweight structures (18 h lesson, 16 exercise)
Structures made of composite materials: laminae and laminates, modelling of laminates using FEM, design and analysis of structures made of composites, short fibre reinforced polymers, process simulation and structural analysis
Sandwich panels: design, optimization and modelling
Joint design: mechanical fasteners, welds, adhesive bonding. Dimensioning and analysis.
Slides of the lectures and of the exercises are available through the Beep channel
A good background in machine design is required. Student with poor background in machine design (e.g. not having passed Machine Design 2) usually find it difficult to address correctly the problems presented in the course.
Knowledge of the basic principles of vibrations are also required.
Previous knowledge of the finite element method is not required, although it is suggested to have a background on the fundamentals of the method, at least regarding beam elements.
Modalità di valutazione
The final exam consist of an oral examination.
During the course, students are asked to hand two reports on homework assignements on structural optimization, which will be evaluated during the course. If they get a pass mark, they can sit for the oral, which will cover only the second part of the course, from composite materials onward. At the oral, they have to present a report in the form of a presentation (ppt slides or equivalent). Th subject of the presentation is one of the topics of the classes (from composites onwards) of student's choice, which will be discussed with the teacher.
If they do not get a pass mark for the homework reports, or if they prefer not to hand in any report, student can freely access the oral examination. During the examination, three exercises chosen by the candidate among those completed during the course will be discussed, on the basis of three presentations. In this case, the exam will cover the whole program.
The evaluation of the homework, of the reports and the oral exams aim at assessing:
- the ability of the student of solving structural optimization problems autonomously, also demostrating the skill of identifying links with other disciplines and applying the corresponding concepts
- the abilty of communicating the results in an effective and technically correct manner
- the knowledge of the principles of lightweight design, with focus on modelling the mechanical behaviour of composite structures.
- the ability of designing a simple lighweight structure.