Hello all, new member and amateur engineer from Tucson, AZ. I am working on a homebuilt, part 103 legal, ultralight project. I am trying to find the formula for deflection of an aluminum tube. I need to know how much weight will cause permanent deformation of a tube suspended between two points. I have the material properties of 6061 T6 aluminum, but none of the formulas seem to take into account the hollow section of the tube and wall thickness. I know a simple formula exists, I just cant find it.(adsbygoogle = window.adsbygoogle || []).push({});

This is what I know about 6061 T6;

Ultimate Tensile Strength= 310 MPa, 45000 psi

Tensile Yield Strength= 276 MPa, 40000 psi

Modulus of Elasticity= 68.9 GPa, 10000 ksi

Ultimate Bearing Strength= 607 MPa 88000 psi

Bearing Yield Strength= 386 MPa 56000 psi

Poisson's Ratio= 0.33

Shear Modulus= 26 GPa 3770 ksi

Shear Strength= 207 MPa 30000 psi

source;http://asm.matweb.com/search/SpecificMaterial.asp?bassnum=MA6061t6

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# Formula for deflection of 6061 T6 hollow tube, please help.

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