Uh... I guess that b is the breadth of a square and l the length of a cuboid with a square face...

Then from

We know that the volume is

Hence, we get:

I don't know what you mean by Fy and sy...

Is that it?

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- Nov 4th 2010, 11:01 AM #1

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- Nov 4th 2010, 11:29 AM #2

- Nov 4th 2010, 11:37 AM #3

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well I am in that point , Fy = failure load of a beam equation , sy=yield strees .

the final Merit index is = sy^2/3 / ρ . I am in the point Fy=b^4/12 / b/2 * σy/(m/b^2*ρ) .

So the thing is , how you get to that σy^2/3 / ρ ?

To make it a bit clearer it will be in the end Fy = b^3 *6 * m σy/2^3/ρ . So this σy/2^3/ρ will be in the final equation as it is now . without any mass or length in its function.

I hope I am clear now .

- Nov 4th 2010, 11:48 AM #4

- Nov 4th 2010, 12:06 PM #5

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- Nov 4th 2010, 12:17 PM #6

- Nov 4th 2010, 12:32 PM #7