Select Materials in the Job Preferences dialog and click the Modification button. Select the Other tab to access the following parameters. 
Define the following: 
Name 
The name for the new user-defined material. 
Note: You must specify the material name before you click Add. 
 
Description
Specifies the description for the user-defined material. 
 
Elasticity
- Young modulus - specifies the value of Young's modulus for the user-defined material. 
 
- Poisson's ratio - specifies the value of Poisson's ratio for the user-defined material. 
 
- Shear modulus - specifies the shear modulus for the user-defined material. The modulus is used when shear deformation calculations are required. 
 
 
Others
- Force density (unit weight) - specifies the density (unit weight) for the user-defined material. 
 
- Thermal Expansion Coefficient - specifies the thermal expansion coefficient for the user-defined material. 
 
- Damping ratio - specifies the damping ratio for the user-defined material. This ratio is used for the dynamic analysis of structures.