The most common usage of the RBE3 element with FEMAP and NX Nastran is to transfer motion in such a way that all six DOFs of the reference point are connected.
The load distributing capability of the RBE3 element makes it an ideal element to use to apply loads from a coarse model (or hand calculation) onto a detailed model of a component. For example, the shear distribution on a cross section is a function of the properties of that section. This shear loading may be applied to a cross section by performing a calculation of the shear distribution based on unit loading and using an RBE3 element with appropriate "weighting factors" for each grid point. In this manner, only one shear distribution need be calculated by hand. Since there are usually multiple loading conditions to be considered in an analysis, they may be applied by defining different loads to the dependent point on the RBE3 element.
The shear force acting on the on the tip of the Z-shape cantilever beam doesn’t act linearly; it is maximum at the neutral plane and tapers to zero at the top and bottom fibers.
In summary, the intended use of the RBE3 element is to transmit forces and moments from a reference point to several non-colinear points. The rotation components 4, 5, and 6 should be placed in the Ci field only for special cases, such as when the independent points are colinear.
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Blas.
www.iberisa.com
Негізгі бет Ғылым және технология Distance Weighting Factor on RBE3 elements with FEMAP and NX Nastran
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