It looks like you are interested in the GPSTRESS capability of Nastran... This is discussed in the Linear Static Analysis User Guide. Her eis an excerpt fromthe introdction section for this capability:
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The grid point stress (GPSTRESS) option in MSC Nastran offers you another alternative. The grid point stress option calculates the stresses at the grid points from the adjoining plate and solid elements in a coordinate system defined by you.
This option enables you to request the output of stresses at grid points in surfaces of two-dimensional plate elements--namely, the CQUAD4, CQUADR, CQUAD8, CTRIA3, CTRIAR, and CTRIA6 elements--and in volumes containing CHEXA, CPENTA, and CTETRA solid elements.
By default, stresses are output at the center of each of these elements and also at the vertices of the CQUADR, CQUAD4 (with corner option), CQUAD8, CTRIAR, and CTRIA6 shell elements as well as the CHEXA, CPENTA, and CTETRA solid elements. This default output is not universally satisfactory because in the case concerning the surfaces of the CQUAD4 (without corner output request) and/or CTRIA3 elements, you often have a requirement for more accurate stress values at the grid points. However, the vertex stresses generated for these elements that connect to a common grid point are often not identical. These deviations are most pronounced with a crude model and converge as the model becomes more detailed. The option described in this section provides a rational method that yields reasonable and unique stresses at each vertex grid point in surfaces or volumes defined by you.
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There are also a couple articles that might be helpful:
It looks like you are interested in the GPSTRESS capability of Nastran... This is discussed in the Linear Static Analysis User Guide. Her eis an excerpt fromthe introdction section for this capability:
----
The grid point stress (GPSTRESS) option in MSC Nastran offers you another alternative. The grid point stress option calculates the stresses at the grid points from the adjoining plate and solid elements in a coordinate system defined by you.
This option enables you to request the output of stresses at grid points in surfaces of two-dimensional plate elements--namely, the CQUAD4, CQUADR, CQUAD8, CTRIA3, CTRIAR, and CTRIA6 elements--and in volumes containing CHEXA, CPENTA, and CTETRA solid elements.
By default, stresses are output at the center of each of these elements and also at the vertices of the CQUADR, CQUAD4 (with corner option), CQUAD8, CTRIAR, and CTRIA6 shell elements as well as the CHEXA, CPENTA, and CTETRA solid elements. This default output is not universally satisfactory because in the case concerning the surfaces of the CQUAD4 (without corner output request) and/or CTRIA3 elements, you often have a requirement for more accurate stress values at the grid points. However, the vertex stresses generated for these elements that connect to a common grid point are often not identical. These deviations are most pronounced with a crude model and converge as the model becomes more detailed. The option described in this section provides a rational method that yields reasonable and unique stresses at each vertex grid point in surfaces or volumes defined by you.
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There are also a couple articles that might be helpful:
