Description
The MAT1 entry defines the material properties for isotropic, elastic materials. In addition to isotropic, elastic constants, density and a coefficient of thermal expansion are also defined on this entry.
Format
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| MAT1 | MID | E | G | NU | RHO | A |
Example
| MAT1 | 13 | 1.+7 | 0.33 | 0.101 |
| Field | Definition | Type | Default |
|---|---|---|---|
| MID | Material identification number | Integer > 0 | Required |
| E | Young's modulus | Real ≥ 0.0 or blank | See Remarks 4, 5, and 6 |
| G | Shear modulus | Real ≥ 0.0 or blank | |
| NU | Poisson's ratio | -1.0 < Real ≤ 0.5 or blank | |
| RHO | Mass density | Real > 0.0 | See Remark 7 |
| A | Thermal expansion coefficient | Real or blank | 0.0 |
Remarks
- The material identification number must be unique for all MATi entries.
- Either E or G must be specified (not blank).
- If any one of E, G, or NU is blank, it will be computed to satisfy the identity E = 2(1 + NU)G; otherwise, values supplied by the user will be used.
- If E and NU or G and NU are both blank, they will both be given the value 0.0.
- Implausible data on one or more MAT1 entries will result in a warning message. Implausible data is defined as any of E < 0.0, or G < 0.0, or NU > 0.5, or NU < 0.0, or | 1 – E / [2(1+NU)G] | > 0.01.
- It is strongly recommended that only two of the three values E, G, and NU be input. The three values may be input independently on the MAT2 entry.
- In Autodesk Explicit, RHO must be a nonzero value greater than zero. The mass density is required to calculate a wave speed for the material.