Mechanical design course

The purpose of a mechanical design course is to allow the machining of machine components of common use in mechanics.

Reminder of RDM (resistance of materials)Before taking a mechanical design course, it is important to have the basis of RDM 5 material resistance.Among these bases of RDM you will find:Mechanical tests such as traction, torsion, fatigue of a material or its hardness, resilience, creep...Mechanical stresses such as traction, torsion, compression, shear, bending or buckling...

The security coefficientthe factor of safety is a very important element in mechanical design.In mechanical engineering, the safety factor refers to the ratio between the strength of the materials and the stresses induced in the parts.It therefore expresses the relationship between the load capacity of a room and the loads it actually supports.

It is usually represented by the symbol s.In a given application, the estimated loads can vary, and it is often difficult to predict all the conditions of use of a machine part. The same is true for the dimensions of the finished part which deviate more or less from the nominal values. The constraint thus also becomes a statistical variable that can be represented by a Gaussian curve. Hence the interest of using a factor of safety to take into account these variations.

The different safety factors used in Mechanical Designing :Safety factor between [1.25 - 1.5]: well proven materials, good quality control, and well-known real constraints;Safety factor between [1,5 - 2,0]: well-known materials and operating conditions;Coefficient of safety between [2.0 - 2.5]: well-known constraints, and materials very often used (This is the most general case in the field of machines)Safety factor between [2.5 - 3.0]: fragile material and used under ordinary conditions;Coefficient of safety between [3.0 - 4.0]: poorly known material behavior or stress state.In addition, the loading of a mechanical part can be variable in time and the breaking tension of a part subjected to variable forces, reproduced a large number of times, is lower than that observed on a test pull test (static) => this is the phenomenon of fatigue that is observed in the mechanical parts.A mechanical design course should also take up the concepts of materials.Concept of stress concentrationIt is important to know the notion of stress concentration on a mechanical part.Do not mechanically design a part assuming a uniform or linear distribution of stress in the material section. Indeed, in practice, the stresses are concentrated in certain parts of the mechanical part such as bolt holes, holidays, keyways...You can take courses in mechanics to learn more about mechanics.

These mechanical design projects can be found both in mechanical engineering schools, for example, or in professional licenses, but also in industry.To carry out this type of project, a project manager in mechanical design is used.The project manager in mechanical design is responsible for the entire mechanical cycle. He is responsible for the design and definition of propulsion system components.

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