Axial Loading on a missile structure
Axial Loading on a missile structure
(OP)
Hello,
I attached a part out of a book which is explaining how to assume stresses in a missile body in the pre-concept phase.
the theory behind is to assume a simple beam with a circular cross-section.
but what i dont quite understand is how they derive the second diagrams?
as far as i understand if you apply a 10G acceleration on the missile every weight increment of the missile reacts with an opposite force of 10G*m
so what does one need to do to end up with the second diagram?
Thanks!
http://i55.tinypic.com/54buds.png
I attached a part out of a book which is explaining how to assume stresses in a missile body in the pre-concept phase.
the theory behind is to assume a simple beam with a circular cross-section.
but what i dont quite understand is how they derive the second diagrams?
as far as i understand if you apply a 10G acceleration on the missile every weight increment of the missile reacts with an opposite force of 10G*m
so what does one need to do to end up with the second diagram?
Thanks!
http://i55.tinypic.com/54buds.png






RE: Axial Loading on a missile structure
If I understand it correctly then the second diagram is the combination of bending stresses and axial stresses, however without the earlier pages I can't tell what they are.
desertfox
RE: Axial Loading on a missile structure
i think the second diagram is supposed to be only the axial load P (see y-axis) over the missile length.
RE: Axial Loading on a missile structure
Can you share the earlier pages?
desertfox
RE: Axial Loading on a missile structure
I disagree with the axial load as shown, it indicates a push from the tail end; in fact, the pressure is in the interior of the body except at the tail; the body is in tension. Think of blowing up a balloon and releasing it without closing the neck, it takes off like an out of control rocket, but the push is inside, not outside.
Most of those big rockets that are vertical when fired can only stand when full of fuel, the shell buckles unless held in place by the fuel, mostly solid fuel.
I picked up most of this information when I designed part of a rocket fuel mixing and loading facility.
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Axial Loading on a missile structure
i uploaded the previous pages.
http:/
RE: Axial Loading on a missile structure
BA
RE: Axial Loading on a missile structure
On where the pressure is applied- I would assume a good bit of the force is from the nozzle, at least on a liquid-fueled rocket.
RE: Axial Loading on a missile structure
ht
I was thinking of the solid fuel rocket where the fuel burns all the way up to the nose
http:/
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Axial Loading on a missile structure
Still can't see the other pages, can you load them as pdf's and upload them through eng-tips as an attachment.
desertfox
RE: Axial Loading on a missile structure
TTFN
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RE: Axial Loading on a missile structure
and by the way. i am new here. could anyone tell me how to edit my posts after posting and how to send private messages?
thanks
RE: Axial Loading on a missile structure
as much as weight (and maneouvre) loads there'll also be lateral aerodynamic loads
RE: Axial Loading on a missile structure
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TTFN
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RE: Axial Loading on a missile structure
There are no bending stresses involved. The first diagram is a listing of the masses for the second diagram.
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Axial Loading on a missile structure
RE: Axial Loading on a missile structure
@paddingtongreen: i guess that makes sense. so the reaction force inside the structure is just going into the opposite direction of T?