This repository contains the source files of CalculiX, a three-dimensional Finite Element Program (www.calculix.de).
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Spurious deformation of B32 and B32R ends with *CLOAD or *BOUNDARY. #15
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victorkemp opened 1 year ago
With a point load at the end of a quadratic beam, there's spurious deformation at the end.
With a nonhomogeneous boundary condition, there is also spurious deformation as well as wrong stress which propagates through the whole model.
It looks like this is caused by CCX using only the 4 corner nodes of beams ends without knots according to the manual equation (753)
u1 + u2 + u3 + u4 − 4u0 = 0
I think it would be better to use all 8 nodes on quadratic beam ends or make a knot there.