| T2061 | WARNING: T2061 | UNREASONABLE MATERIAL DATA |
| Cause: | A MAT1, MAT8, or MAT12 Bulk Data entry contained an invalid modulus of elasticity, shear modulus, or Poisson’s ratio. Material stability checks are performed for orthotropic materials as defined in the Remarks section of the applicable Bulk Data entry. | |
| Action: | Check the input values for modulus of elasticity, shear modulus, and Poisson's ratio. To specify an isotropic material, it is recommended that only two of the three values are input with the remaining left blank. | |
| Remarks: | See Autodesk Nastran Reference Guide, Section 4, Bulk Data, for entry format. |