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Stressed skin materials question

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Old Jun 23, 2007 | 07:46 AM
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Derek 357i's Avatar
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Default Stressed skin materials question

I know this has nothing to do with LSX engines, but you guys are some of the sharpest out there.

These questions pertain to building a stressed skin lightweight chassis for a C5 powertrain (shortened torque tube) and suspension. The center tub would essentially be a twin beam with center backbone, with conventional front and rear stubs to hold the engine/suspension in the front, and transaxle/suspension in the rear. The aluminum skin would be bonded and riveted to the steel structure.

Question:

For the side "tubes" and center backbone, I would be using 1x1x1/8" angle steel to form the box, with 3/4"X3/4"X1/8" stringers periodically to support the skin and keep it from buckling be stonger than the same arrangement with 1x1x.063 square tubing and 3/4"X3/4"X.063 stringers?

If what I am asking is not clear, picture a 5 foot long cardboard box, that is 1 foot high and 5" wide. All of the inside corners would have either the 1" angle or square stock, and every 18" the 3/4" stock would follow the shape of the box.

Last edited by Derek 357i; Jun 23, 2007 at 09:33 AM.
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Old Jun 23, 2007 | 09:17 AM
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Originally Posted by Derek 357i
I know this has nothing to do with LSX engines, but you guys are some of the sharpest out there.

These questions pertain to building a stressed skin lightweight chassis for a C5 powertrain (shortened torque tube) and suspension. The center tub would essentially be a twin beam with center backbone, with conventional front and rear stubs to hold the engine/suspension in the front, and transaxle/suspension in the rear. The aluminum skin would be bonded and riveted to the steel structure.

Question:

For the side "tubes" and center backbone, would using 1x1x1/8" angle steel to form the box, with 3/4"X3/4"X1/8" stringers periodically to support the skin and keep it from buckling be stonger than the same arrangement with 1x1x.063 square tubing and 3/4"X3/4"X.063 stringers?

If what I am asking is not clear, picture a 5 foot long cardboard box, that is 1 foot high and 5" wide. All of the inside corners would have either the 1" angle or square stock, and every 18" the 3/4" stock would follow the shape of the box.
Use the square tubing. Try this experiment: build an sample angle about a foot ot two long from balsa wood in the sizes and thicknesses you plan to use in steel. Build a square tube similarly. Now load the two in bending and torsion with your hands. The answers should be obvious.
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