MAT9

Solid Element Anisotropic Material Property Definition

Description: Defines the material properties for linear temperature-independent, anisotropic materials for solid isoparametric elements.

Format:

Example:

Field	Definition	Type	Default
MID	Material identification number.	Integer > 0	Required
Gij	Elements of the 6 x 6 symmetric material property matrix in the material coordinate system.	Real	Required
RHO	Mass density.	Real or blank	0.0
Ai	Thermal expansion coefficient vector.	Real or blank	0.0
TREF	Reference temperature for the calculation of thermal loads.	Real or blank	0.0
GE	Structural element damping coefficient. See Remarks 7 and 9.	Real or blank	0.0
ST, SC, SS	Allowable stresses in tension, compression, and shear, respectively. Required if composite element failure index is desired.	Real ≥ 0.0 or blank	0.0

Remarks:

1. The material identification number must be unique for all MATi entries.
2. The third continuation entry is optional.
3. The subscripts 1 through 6 refer to x, y, z xy, yz, zx of the material coordinate system (see the MCID field on the PSOLID entry description). The stress-strain relationship is:

   

4. MAT9 materials may be made temperature-dependent by use of the MATT9 entry. In STATIC solutions, linear elastic material properties will be updated as prescribed under the TEMPERATURE Case Control command.
5. The mass density, RHO, will be used to automatically compute mass for all structural elements.
6. Weight density may be used in field 8 if the value 1/g is entered on the PARAM, WTMASS entry, where g is the acceleration of gravity.
7. To obtain the damping coefficient GE, multiply the critical damping ratio C/C0, by 2.0.
8. TREF is used only as the reference temperature for the calculation of thermal loads in linear solutions. If TEMPERATURE(INITIAL) is specified, TREF will be ignored.
9. If PARAM, W4 is not specified, GE is ignored in transient response analysis. (See Section 5, Parameters, for more information on W4.)