- #1

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Maybe this image clarifies my problem:

So the force will be split op in a force-moment couple at the center of gravity... But what to do with the applied torque? (Or moment, depends on how you look at things)

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- Thread starter Seppe87
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- #1

- 9

- 1

Maybe this image clarifies my problem:

So the force will be split op in a force-moment couple at the center of gravity... But what to do with the applied torque? (Or moment, depends on how you look at things)

- #2

mfb

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- #3

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Here I already split the force in a force in the centroid and a moment around the centroid. My question is: How do I find the maximum stress in this cross section? Where is it going to fail first? I want to know how thick my walls have to be depending on the y-value of the application point.

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mfb

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- #8

AlephZero

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How do I find the maximum stress in this cross section? Where is it going to fail first? I want to know how thick my walls have to be depending on the y-value of the application point.

That depends on how the object is restrained. I guess you know what problem you are trying to solve, but just drawing a circle doesn't give us much information. You mentioned the thickness of "walls" but it isn't clear what they are from your drawing.

I'm still confused about your "momemt" arrow with two heads. Is it supposed to be a moment parallel to the Y axis, so the left hand side of the "circle" is trying to move in towards us out of the X-Y plane and the right hand side is trying to move away from us?

True, and usually the stress field is singular where the point load is applied, so the stress there is "infinite". But since point forces and moments don't exist in the real world, this is not necessarily a real-world problem.

- #9

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About the moment. Yes, all to the left is 'coming towards you' and to the right 'away from you'. I think I solved it. I originally wanted to create a function that would plot the maximum stress at any given point of the circle. But that was too much work if I only need the know what the maximum value is. So I thought about the places where maximum stress could occur: most left side due to the moment applied or the top side due to the force applied and its induced moment. So I calculated stresses in these two points and found that the top would be most prone to failure. Thanks all for your help!

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