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How can I achieve a compression contact with tension failure between a transverse member and a slightly curved membrane surface?

Answer

The nonlinear contact between the transverse member and the membrane can be performed by a set of member elements between the member and the surface. This requires that the member lies eccentrically in the plane of the compression forces resulting from the membrane action and the connection line of the membrane connection. The geometric distance between the member and the membrane itself must be aligned with the physical distance between the member axis and the membrane connection.

To ensure that the coupling runs homogeneously over the entire coupling length, it is necessary to ensure a uniform arrangement with the same number of FE nodes on the member axis and on the projected contact line on the membrane surface. This division and orientation of the FE nodes is achieved by a corresponding placement of topology nodes on the member axis and the corresponding contact line on the surface. In this case, the distance of the topology nodes should be selected affine to the selected mesh size of the adjacent membrane surface.

The coupling itself must be designed with a rigid member failing nonlinearly under the compression load between the resulting node pairs. In this case, the specified nonlinearity must be implemented with the member nonlinearity "Failure under tension." The connection of the rigid member is fully compatible (rigid) in the area of the eccentric member and must be performed with a free translational hinge in the y/z axis that is locally related to the rigid member axis in the area of the membrane.

Due to the selected nonlinearity and the orientation to the resultant of compressive force in conjunction with the free translational hinge, this contact modeling is only able to transfer compressive forces to the connected crossmember. In the case of suction loading, the coupling components fail and the membrane moves freely away from the crossmember.

Keywords

Contact Lifting Release Collision

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