GPSTRAIN

I/O Options and Subcase Information Entry Can be used to request grid point strain output for all or individual subcases, respectively.

Format

GPSTRAIN (format_list, averaging, neuber, type, extras) = option

Definitions

Argument	Options	Description
`format_list`	<H3D, PUNCH, OP2, blank>	H3D Results are output in Hyper3D format (.h3d file). PUNCH Results are output in Nastran punch results format (.pch file). OP2 Results are output in Nastran output2 format (.op2 file). 8 blank (Default) Results are output in all active formats for which the result is available.
`averaging`	<GLOBAL, BYPROP> Default = BYPROP	GLOBAL Only the globally averaged GPSTRAIN results are output. BYPROP, blank Both the globally averaged GPSTRAIN results and the GPSTRAIN results averaged by property for each property are output.
`type`	<VON, PRINC, MAXS, SHEAR, ALL, TENSOR, DIRECT> Default = ALL	VON Only von Mises strain results are output. PRINC, MAXS, SHEAR The von Mises and maximum principal strain results are output. ALL, blank All strain results are output. TENSOR All strain results are output. Tensor format is used for H3D output. DIRECT All strain results are output. Direct format is used for H3D output.
`extras`	<YES, ALL, blank, NO, NONE, SID> Default = ALL	YES, ALL, blank Grid point strains output for all elements. NO, NONE Grid point strains are not output. SID If a set ID is given, grid point strains are output only for nodes listed in that set.
`neuber`	<NEUBER> Default = blank	The Grid Point strains, corrected with Neuber rule are output the H3D file. This is currently only supported for Static analysis. 9
`option`	<YES, ALL, NO, NONE, SID> Default = ALL	YES, ALL, blank Grid point strains output for all elements. NO, NONE Grid point strains are not output. SID If a set ID is given, grid point strains are output only for nodes listed in that set.

Comments

When a GPSTRAIN command is not present, grid point strains are not output.
Grid point strains are only available for solid elements, additionally GPSTRAIN is currently only supported for Static Analysis.
Grid point strain are not available for elements which form part of a topology design space. When an analysis only run is performed, grid point strains are available for all solid elements. When PARAM, REANAL is used, grid point strain contributions are only calculated for fully dense elements.
Multiple formats are allowed on the same entry; these should be comma separated. If a format is not specified, this output control applies to all formats defined by the OUTPUT command, for which the result is available.
Multiple instances of this card are allowed; if instances are conflicting, the last instance dominates.
For optimization, the frequency of output to a given format is controlled by the I/O option OUTPUT.
Grid point strains are output for the entire model and for each individual PSOLID component. This allows grid point strains to be accurately obtained at the interface of two components referencing different material definitions.
format=OUTPUT2 can also be used to request results to be output in the Nastran output2 format (.op2 file).
Neuber corrected grid point strains are calculated based on the Grid point strain from elastic analysis, the Young’s modulus, and the nonlinear material properties defined on the MATS1 Bulk Data Entry. If any grid is located at the junction of two elements of different materials, then the average of the Neuber results of each material is output. Both plastic strain and total strain output are available.