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
| 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.