MAT1
Bulk Data Entry
MAT1 – Material Property Definition, Form 1
Description
Defines the material properties for linear, temperatureindependent, and isotropic materials.
Format
(1) 
(2) 
(3) 
(4) 
(5) 
(6) 
(7) 
(8) 
(9) 
(10) 
MAT1 
MID 
E 
G 
NU 
RHO 
A 
TREF 
GE 


ST 
SC 
SS 






Example
(1) 
(2) 
(3) 
(4) 
(5) 
(6) 
(7) 
(8) 
(9) 
(10) 
MAT1 
17 
3.+7 

0.33 
4.28 




Field 
Contents 
MID 
Unique material identification number. No default (Integer > 0) 
E 
Young’s Modulus. Default = blank (Real or blank) 
G 
Shear Modulus. Default = blank (Real or blank) 
NU 
Poisson’s Ratio. Default = blank (1.0 < Real < 0.5 or blank) 
RHO 
Mass density. No default (Real) 
A 
Thermal expansion coefficient. No default (Real) 
TREF 
Reference temperature for thermal loading. Default = 0.0 (Real) 
GE 
Structural Element Damping coefficient. See comments 11 and 12. No default (Real) 
ST, SC, SS 
Stress limits in tension, compression and shear. Used for composite ply failure calculations No default (Real) 
Comments
2.  The mass density, RHO, is used to automatically compute mass for all structural elements. 
3.  Either E or G must be specified (i.e., nonblank). 
4.  If any one of E, G, or NU is blank, it is computed to satisfy the identity E = 2(1+NU)G; otherwise, values supplied by you are used. 
5.  If E and NU are both blank, they are both given the value 0.0. 
6.  If G and NU are both blank, they are both given the value 0.0. 
7.  Implausible data on one or more MAT1 entries result in a warning message. Implausible data is defined as E < 0.0 or G < 0.0 or NU > 0.5 or NU < 1.0 or except for cases covered by comments 5 and 6. 
8.  It is strongly recommended that only two of the three values E, G, and NU be input. 
9.  A warning is issued if NU < 0.0. 
10.  The large field format may also be used. 
11.  To obtain the damping coefficient GE, multiply the critical damping ratio, , by 2.0. 
12.  TREF and GE are ignored if a MAT1 entry is referenced by a PCOMP entry. 
13.  This card is represented as a material in HyperMesh. 
Element Type 
E 
NU 
G 

CROD, CBAR, CBEAM, and CWELD 
Axial and Bending 
N/A 
Transverse Shear and Torsion 
CSHEAR 
N/A 
N/A 
Shear 
CQUAD and CTRIA 
Membrane and Bending 
Membrane and Bending 
Transverse Shear 
CHEX, CTETRA, CPENTA, CPRYRA and CSEAM 
Deformation 
N/A 
See Also
Material Property Checks for MAT1
Go To
Guidelines for Bulk Data Entries