What is the effect of the stiffness type "Membrane Without Tension" in the surface properties?


The stiffness type "Membrane Without Tension" describes the plate and block stiffness of surfaces.

The plate stiffness including the shear stiffness perpendicular to the surface plane is linearly elastic and the plate stiffness in the surface plane is defined nonlinearly elastic with the material model according to "Drucker-Prager" depending on the defined thickness and the assigned material.

In order to ensure that the surface behaves "Without Tension" in the pane direction, the nonlinear material model reacts with yielding tensile stress fy,t going to almost zero in tension-loaded elements in combination with a relatively small hardening modulus Ep . For compression forces, however, the elements remain linearly elastic due to a relatively high yielded compressive stress fy,c and react with an unrestricted compression transmission.

Since the "Membrane Without Tension" stiffness type fundamentally modifies the wall-related degrees of freedom of surfaces, it is only applied to surfaces of the relevant model types 3D, 2D - XZ (uX/uZY) and 2D - XY (uX/uYZ ).

To better describe the partial nonlinearity of this surface stiffness type, the release RFEM 5.06.1103 from 4.02.2016 renames the type from "Without Tension" to "Membrane Without Tension".

The Knowledge Base article "Modeling Approaches for Shear Bearing Connections by FEM" shows a possible application.


Without tension Hole bearing Failure Stiffness type Bolts Bolt


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RFEM 5.xx

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Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

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