Rigidity and flexibility of CF Tubes

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Rigidity and flexibility of CF Tubes

Rigidity and flexibility of CF Tubes

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Job_CF	J Job_CF posted 7 Years Ago HOT Topic Details
J Group: Forum Members Posts: 6, Visits: 26	Hi I am looking to build a trike unit for a microlight aircraft as in the photo. but using CF tubes in place of the aluminium tubes. Some tubes needs to be rigid with good tensile and compressive strength but with little or no flexibility. The pair of undercarriage legs, 1 meter each, need to flex about 3 to 4 inches when landing. Total weight including pilot is 170 kg. Recommendations please on the type of CF tubes by Easy Composites. Also is there a website or calculator to figure out how much a particular type of tube will flex for a given load? Thanks! Edited 7 Years Ago by Job_CF
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oekmont	oekmont posted 7 Years Ago HOT Post Details
Group: Forum Members Posts: 550, Visits: 27K	0°, as you are bending the tube.
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Rigidity and flexibility of CF Tubes

Job_CF - 7 Years Ago

As you got an engineering background, you should be able to calculate the propertys of the tubes. There are usually no data sheets with mechanical propertys available for cured composites parts. But...

oekmont - 7 Years Ago

I would be looking at our Roll Wrapped Carbon Fibre range of tubes for this application. Mechanical data is available for the tubes which means you can calculate the deflection based on the loads.....

Warren (Staff) - 7 Years Ago

Thanks Warren. Heavy landing on one of the two rear wheels often happens in cross wind and turbulent conditions. So for load, I will be using 6 x 170kg per wheel. Are the mechanical properties for....

Job_CF - 7 Years Ago

The properties are similar based on our experience, due to similar construction (except for the surface finish). However we do not have formal mechanical data for the woven finish tubes yet.

Warren (Staff) - 7 Years Ago

The landing is more of an energy problem, then an ultimate strength problem. The question is if the tube can store up enough energy before hitting the critical deflection (ground contact).

oekmont - 7 Years Ago

Does anyone know of a Round Tube Beams Deflection Calculator where material property values of a material (eg. roll wrapped of CF tube) can be entered manually? Thanks!

Job_CF - 7 Years Ago

for iterations i simply use excel

oekmont - 7 Years Ago

Yes, good idea to use Excel. Due to the orientation of the fibers, 'Roll Wrapped' and 'Woven Finish' CF tubes have different ultimate tensile and compression strengths. What are the appropriate...

Job_CF - 7 Years Ago

f=(F*l^3)/(3*E*I) f= deflection l= length between support and wheel E= Young's modulus I= Moment of inertia E depends on the laminate

oekmont - 7 Years Ago

I know these two MI for Solid Round Beams = (pi * (OD4 - ID4)) / 64 Deflection = (length^3 * force) / (3 * E * MI) where MI = Moment of Inertia E = Modulas of Elasticity in psi But two different....

Job_CF - 7 Years Ago

0°, as you are bending the tube.

oekmont - 7 Years Ago

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