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This command allows the user to perform a results extrapolation on gaussian or invariant result data sets. It is done on an element by element basis. If results within an element are invariant, an invariant extrapolation is used. If the results distribution is linear, a linear extrapolation is used. If the results are not invariant, and are not linear, a quadratic extrapolation will be used. Extrapolation is carried out on all components of the selected attribute.

The resulting data is stored as a new element nodal result data set. This new data set takes the name of the current attribute (the result selected for extrapolation), unless this attribute name already exists for element results, in which case the user is then prompted for a new attribute name.

**Notes:**

- 1.
**Loadcases**

The extrapolation is performed on the selected results for all of the selected loadcases.- 2.
**Extrapolation of gaussian results**

The extrapolated results will be valid only if the gauss point coordinates are given in their undeformed state.**FEMVIEW**assumes that this is the case and the user should take care to ensure that the command is only used in this situation.- 3.
**Extrapolation of gaussian results with unknown Gauss Points coordinates**

When the Gauss Points coordinates are unknown (set to zero in FEMVIEW), extrapolation is performed by calculating the average of the results at all the element Gauss Points and allocating this averaged value to each of the element nodes.For example with an ABAQUS analysis if the user has not requested the output of the Gauss Points coordinates, the gaussian results will still be transferred by the post-processor

**postabaqus**but with zero values for the Gauss Points coordinates.- 4.
**Use of extrapolation with assemblies**

It is not currently possible to extrapolate results at the assembly level.

1st October 1999