ObjectivesThe purpose of this course is to provide students with basic notions in applied mechanics necessary for effective communication with specialists such as mechanics, technicians and design engineers within a framework of research-oriented project design. It will revolve around 3 main axes: design, manufacture and stress analysis.
- Design: design office
The techniques represented not only have the aim of reading documentation, but also of writing?for actual implementation. Establishing a set of specifications is the objective of a specific course in which ideas of basic requirements, operation and techniques for ending up with constructive solutions are given. The thinking around these topics is all about research-specific mechanical design, the way experiments evolve, means of production limited to everyday machines ignoring ideas of industrialisation such as cost and the market. Before starting a specific case study, a presentation of basic practical solutions is given: assembly, rotational and translational control, sealing. Choice of materials is presented with a quick review of functional chains (actuators, reducers, transmitters), the last ideas to be put into place.
- Manufacture: machining
An introduction to mechanical forming techniques by removal of material, illustrated by the different machines to be found in a basic research laboratory workshop, e.g. lathes, milling machines, pillar drills. Also considered are the mechanics of chip formation and rupture, different tools and their usage, and the choice of cutting conditions.
Students should put into practice a simple prototype mechanical assembly similar to one produced in the DO. Use of lathes, milling machines and drills will provide basic ideas about manufacture, and a wide range of techniques such as surface finishing, starting off, drilling, boring, tapping and threading. Elementary ideas of metrology will arise naturally. Final assembly will illustrate the problems of adjustment between components.
- Strength of materials: stress analysis
Basic ideas on the strength of materials, stress and elastic deformation, are introduced during a 5-hour course. The response of deformable materials under simple influences will be studied: tension/compression (Hooke's law, elastic constants, strain gauges), flexure (bending equation of a beam, calculation of deflection), simple shear, pure shear, torsion. The course is completed by tutorials where solutions to concrete mechanical problems are put forward.
For practical reasons, the courses, tutorials and practicals are contained within a single "Practical" module, passing from one to the other during the course of the instruction.
- Design Office: Project implementation (design, specifications, technical drawings)
- Manufacture: Fabrication of parts as per the Design Office project
- Strength of Materials: Illustration of the principles of strength of materials: determination of elastic constants, e.g. Young's modulus, shear modulus, Poisson's ratio, by extensiometer testing of samples in tension, bending and torsion; determination of the stress field by photoelastic methods such as isocline grids, isochromes and isostatics on simple geometric models in tension or compression.
Requirements : None.
Evaluation mechanism : Rating of the workpieces and attendance evaluation.
Last Modification : Tuesday 6 March 2018