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Jul 13, 2007
05:58 AM

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Jul 13, 2007
05:58 AM

rotation animation

hi,

Suppose i need to give theta rotation using a cylindrical cordinate system for a hollow cylindrical shaft, the result animation shows for scale 1 as if the body's diameter increased, though the displacements in other directions are arrested.

Is it possible to animate a complete 360 deg rotation in FEA?

suresh

Suppose i need to give theta rotation using a cylindrical cordinate system for a hollow cylindrical shaft, the result animation shows for scale 1 as if the body's diameter increased, though the displacements in other directions are arrested.

Is it possible to animate a complete 360 deg rotation in FEA?

suresh

1 REPLY 1

Jul 17, 2007
11:42 PM

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Jul 17, 2007
11:42 PM

No, not in 'small displacement' solution (which is what Pro/M does).

'Small displacement' means that negligible displacement components are (rightfully) ignored. In case of twisting load applied to a cylinder it means that displacement vector of a point on, say, outer diameter is assumed to be tangent to that circle -- picture it and you'll see that a point moving in tangent to a circle direction is not staying on that circle but also moves farther from the center. That's why you see that 'mushrooming' effect (which you can also always see if you simply set a large displacement magnification coefficient on that kind of analysis model, no matter if the load is large or small).

The 'small displacement' assumption is OK if displacements are indeed small.

You can google 'geometrical non-linearity', 'small displacement', 'small deformation' etc to find more on that.

Hope it'll help,

Yuri

suresh natarajan <-> wrote:

hi,

Suppose i need to give theta rotation using a cylindrical cordinate system for a hollow cylindrical shaft, the result animation shows for scale 1 as if the body's diameter increased, though the displacements in other directions are arrested.

Is it possible to animate a complete 360 deg rotation in FEA?

suresh

'Small displacement' means that negligible displacement components are (rightfully) ignored. In case of twisting load applied to a cylinder it means that displacement vector of a point on, say, outer diameter is assumed to be tangent to that circle -- picture it and you'll see that a point moving in tangent to a circle direction is not staying on that circle but also moves farther from the center. That's why you see that 'mushrooming' effect (which you can also always see if you simply set a large displacement magnification coefficient on that kind of analysis model, no matter if the load is large or small).

The 'small displacement' assumption is OK if displacements are indeed small.

You can google 'geometrical non-linearity', 'small displacement', 'small deformation' etc to find more on that.

Hope it'll help,

Yuri

suresh natarajan <-> wrote:

hi,

Suppose i need to give theta rotation using a cylindrical cordinate system for a hollow cylindrical shaft, the result animation shows for scale 1 as if the body's diameter increased, though the displacements in other directions are arrested.

Is it possible to animate a complete 360 deg rotation in FEA?

suresh