2006-12-27 07:55:16 · 7 answers · asked by Karin P 1 in Science & Mathematics ➔ Engineering
the solid rod is stronger of the same diameter.
The hollow rod is of the same amount of material.
This has to due with the moment of inertia
2006-12-27 08:13:25 · answer #1 · answered by Wazupy 1 · 1⤊ 0⤋
For most loads, 90-95% of the load is carried in the outer 10% of the solid rod. So if you were trying to save weight, you could use a hollow rod to get rid of a lot of weight without sacrificing strength. Also, in general, the larger diameter, the stronger the rod will be. So if you had two rods that were the same weight and one was hollow and the other was solid, the hollow one would have a larger diameter (remember, they're the same weight) and would be stronger. I would encourage you to do a little experiment. You may be surprised at just how much difference the diameter can make in strength.
2006-12-29 01:39:18 · answer #2 · answered by BigBrain 2 · 0⤊ 0⤋
Strangely enough, I think that the hollow rod is. Its something to do with the thinner walls being allowed to pass the stress at the expense of more sag while a solid section won't sag so much but will crack sooner.
But some people say a hollow rod is slightly weaker BUT the strength to weight ratio is much better. So I'm afraid I don't know which is right.
2006-12-27 16:09:47 · answer #3 · answered by Anonymous · 0⤊ 0⤋
This is a common urban myth that the tube will be stronger than a rod. I have actually had to argue this with my engineering colleges a few times.
The solid rod will be stronger. I have done stress analysis on this to prove it.
A good extreme example would be to try and crush an aluminum beer can. This is essentially a tube with ends on it. Now image the can as a solid piece of aluminum. Do you think you could do any damage to it with your hands? I think not.
2006-12-27 16:39:32 · answer #4 · answered by scubamasterme 3 · 1⤊ 0⤋
A solid rod is always stronger than a tube of the same diameter. When you say "stronger," however, you may want to specify if you mean axial strength in compression or tension, bending, or torsion.
A solid rod will resist buckling (due to axial compression) better than a tube of the same diameter and material.
A solid rod will resist stretching (due to axial tension) better than a tube.
A solid rod will also be less likely to bend than a tube.
Finally, a solid rod will resist torsion (twisting about the axis) better than a tube.
2006-12-27 17:20:59 · answer #5 · answered by L Dawg 3 · 2⤊ 0⤋
It is depended on section shape ( area , moment of inertia , section modulus , width , height ,radius ) and length of rods .
2006-12-28 02:03:39 · answer #6 · answered by Masih i 1 · 0⤊ 0⤋
Trick question, are the two equal in material?
2006-12-27 17:02:41 · answer #7 · answered by south of france 4 · 0⤊ 0⤋