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This command requests the calculation of principal shears as defined in Appendix H of the User Manual Appendices. The components are `Q1', `Q2', `Q3' or `QMAX'.
The calculation will be performed on the current result attribute which must contain a stress matrix, or principal stresses. It is possible to specify how the principal stresses should be sorted prior to the calculation of the principal shears.
| Component | Sort | Comments |
| Q1 | NOSORT | No sort of the principal stress components is made |
| Q2 | prior to the calculation of the principal shears. | |
| Q3 | ||
| MAX | ||
| 2DSORT | Prior to the cacluation of the principal shears, | |
| the principal stress components are sorted so that | ||
| with a 2D model having one principal stress 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 | Prior to the cacluation of the principal shears, | |
| the principal stress 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 Q1 component of principal shear is calculated for the current result attribute. The principal stresses used for the calculation will be sorted according to the `2DSORT' described above.
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