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reg7066

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- How much steel needed to support 500 lbs at 40" on a cantilever

Hi, I am trying to figure out how many 1" steel square tubing pieces it would take to support a 500lb weight extended out 40" on a cantilever.

I have seen Modulus of Elasticity figures ranging from .029 GPa to 200 Gpa for Steel. The steel I plan to use would be common hot rolled square tubing. I have not found a figure specific to this material.

I figure my Moment of Inertia to be 20,000 ft-lbs

I've used this information:

Mod of El (lbs/in^2) = 29,000,000

Moment I=wl (in^4) = 20,000

Load W (lbs) = 500

Distance l (in) = 40

Distance x (in) = 32

Distance z (in) = .5

To find these answers:

Stress 32" (lbs/in^2) = .1000

Stress 40" (lbs/in^2) = .5000

Deflection 32" (in) = .000

Deflection 40" (in) = .00002

Section Modulus (in^3) = 40000.000

I don't understand all this stuff enough to know what to do with the information. What else do I need to find in order to answer the above question?

I have diagrams of the build if anybody is interested in knowing more specifics.

I have seen Modulus of Elasticity figures ranging from .029 GPa to 200 Gpa for Steel. The steel I plan to use would be common hot rolled square tubing. I have not found a figure specific to this material.

I figure my Moment of Inertia to be 20,000 ft-lbs

I've used this information:

Mod of El (lbs/in^2) = 29,000,000

Moment I=wl (in^4) = 20,000

Load W (lbs) = 500

Distance l (in) = 40

Distance x (in) = 32

Distance z (in) = .5

To find these answers:

Stress 32" (lbs/in^2) = .1000

Stress 40" (lbs/in^2) = .5000

Deflection 32" (in) = .000

Deflection 40" (in) = .00002

Section Modulus (in^3) = 40000.000

I don't understand all this stuff enough to know what to do with the information. What else do I need to find in order to answer the above question?

I have diagrams of the build if anybody is interested in knowing more specifics.