Learning Forum

[Alessandro Agostinelli]

Hi, 

I'm trying to find the compliance factors of a curved beam flexure. The geometry is a simple curved beam (R=30mm, angle=45°) with a rectangular shape section (w=6 mm,t=1.2mm), like that:

I fixed one end and applied the force vector components (one by one) at the other one; then, I measured the displacements/rotations at the free end and divide displacement by force (or rotation by moment) to obtain the compliance factors, but I dind't get the correct results.

The correct compliance factors are analitically calculated (m/N or rad/Nm) compared to coordinate system "g" fixed at free end (like in previous picture, where x_g is red and z_g is green):

How can I do to obtain the same results with a FEA?

 

[dlooman]

The general procedure is correct.  You mention coordinate systems.  The Ansys input and results are probably in global cartesian unless you have transformed them.  Are the analytical results perhaps in a cylindrical coordinate system?  You didn't give the Ansys results.  How "incorrect" were they?

[peteroznewman]

Dave, this a a duplicate discussion. The first discussion has some replies.

/forum/forums/topic/compliant-mechanisms/