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This command requests the calculation of principal strain from engineering strain values as defined in Appendix H of the User Manual Appendices. The components are `P1', `P2', `P3' or `ALL'.
The calculation will be performed on the current result attribute which must contain a strain matrix.
When this command is issued the user must be sure that engineering strains are available from the finite element analysis software. (However, if the mathematical strains are available from the analysis then RESULTS CALCULATE P-STRESS can be used to calculate the principal values as the equation takes the same form.)
| Component | Sort | Comments |
| ALL | ||
| P1 | NOSORT | No sort of the components is made. |
| P2 | ||
| P3 | ||
| 2DSORT | The components are sorted so that with a 2D model | |
| having one principal strain of zero this value is | ||
| discarded and the other two are sorted such that | ||
| when requesting `P1' the user will get `PMAX' and | ||
| when requesting `P2' the user will get `PMIN', | ||
where `PMAX'  `PMIN'. | ||
| 3DSORT | The components are sorted so that when requesting | |
| `P1' the user will get `PMAX', when requesting `P2' the | ||
| user will get `PMID' and when requesting `P3' the user | ||
| will get `PMIN', where `PMAX' `PMID' `PMIN'. |
Examples:
The P1 component of principal strain is calculated for the current result attribute. PMAX will be given.
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