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Hi, I have seen that normally the maximum shear stress is about 0.3 of maximum contact pressure at a aprox depth of 0.786b (b is the width of the contact surface). Then, you need to apply a theory of failure. If you use the maximum shear stress theory for ductile materials, you need to compare...

It is an optical telescope, but anyway the part belongs to an instrument placed on the telescope focus. Several instruments can be mounted on the same telescope. The part has already been manufactured and everything has gone well until now. I have used a veil fiberglass coating between the...

Hi, I expect to have a gradient about 50K maximum. The aluminium is a solid requirement mostly because the parts are already manufactured and the time is too short to change the material, unfortunately. I will study the use of fasteners, thank you very much

Hi all, The application of this part will be in the astronomic field, for an instrument used in huge telescopes. It is obviously far from the tight requirements of the airplane's components. Both carbon fiber wall and the aluminium frame have to be properly attached together to avoid the...

Thank you all, your comments are very useful! The part, while having a cylindrical shape in half of the body, has also many different surfaces including flat panels of 2x1 meters. Trying to be concise, I described the piece too simplified. We will use isophtalic resin and E type fiberglass for...

Hi! apparently, the chopped mat ply adapts better to the mould walls, it is more flexible, so it reduces the risk of air trapping and imperfections at corners and angles. I would prefer to remove it, but they have said that it is more risky...

Hi again! I would need some recommendations for a problem that I have with an aluminium frame that has to be attached to a carbon fiber laminate wall. I have realised that three main problems may occur: galvanic corrosion of the frame, high stress on materials due to thermal properties mismatch...

Hello everybody, I have recently entered in the world of composites so I still have too many questions without answer... I have designed a part with a balanced and simmetric laminate with 4 cuatriaxial woven fabric plies(so 16 plies of 0-45+45-90º). The part will be made by hand lay-up. The...