Dear all ,
I have a one fixed-end cylinder under bending force simulated in Abaqus. I run a geometric non-linear analysis and now I want to find the curvature at some specific point across the length. I want to measure the curvature ( κ ) at a portion of my model ( dz ) by applying κ = dθ/dz = (θc1-θc2 )/dz ,where θ is the rotation around y-axis and θc1,θc2 is the rotation of the center of the portion dz. Is it possible to find these rotations at the center c1,c2 of a portion of my model? Is any other way to find the curvature?
I am not sure what your portion dz is. Your formula is correct for a portion of arc length ds in the limit ds to zero. But if dz is in z direction then the curvature is κ=dθ/ds=(dθ/dz)/(dz/ds)=(d2y/dz2)/(1+(dy/dz)2)3/2.
If you were not doing geometrically nonlinear analysis you could approximate κ=dθ/ds=d2y/dz2.
Manfred Staat Thank you for your reply. dz is the length of that piece of my cylinder that I want to find the curvature. Is any way abaqus allow my to find the curvature or I have to do it manually?
Hi Spyros Arvanitis
I think you should compute it by yourself.
I suggest you to active COORD in the step. Then, you will have the coordinate points (x,y,z) after the deformation. Consider that and using the nodal/rotation displacement, I think you will be able to compute what you want.
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