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Point constriant in Weak Form PDE (elasticity problem)
Posted Jun 9, 2016, 1:40 a.m. EDT 1 Reply
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Dear all,
I try to solve the beam pure bending problem using weak PDE formulation of elasticity. I've got a problem with boundary conditions. The loads are self equilibrated. Therefore I need to eliminate only the rigid body motions. I use the symmetry conditions in the beam axis direction and in the lateral direction (the model is the one quarter of the beam). But I can't find how to eliminate the vertical translation without stress concentration. As I understand it, I need to use the point constraint. But Pointwise Constraint, Weak Constraint or Weak Contribution in the single point don't work (Returned solution is not converged).
Could You help me please!
I try to solve the beam pure bending problem using weak PDE formulation of elasticity. I've got a problem with boundary conditions. The loads are self equilibrated. Therefore I need to eliminate only the rigid body motions. I use the symmetry conditions in the beam axis direction and in the lateral direction (the model is the one quarter of the beam). But I can't find how to eliminate the vertical translation without stress concentration. As I understand it, I need to use the point constraint. But Pointwise Constraint, Weak Constraint or Weak Contribution in the single point don't work (Returned solution is not converged).
Could You help me please!
1 Reply Last Post Jun 9, 2016, 4:20 a.m. EDT
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Posted:
8 years ago
I think I've got it by myself
It should be used the Pointwise constraint for the vertical traslations of the whole edge in the centre of the beam (but not for the single point). And it works now!
It should be used the Pointwise constraint for the vertical traslations of the whole edge in the centre of the beam (but not for the single point). And it works now!