Material Definition and Assignment

The association of material properties to a part is performed in two stages; the material is defined using the command

PROPERTY MATERIAL GENERAL [matname] 96 reals...

and attached to a geometric part or set of parts via the command

PROPERTY ATTACH partname matname

All elements must have a material property regardless of the destination analysis code.

The material properties are defined by the following list of 96 real numbers which correspond to the PATRAN Neutral file definitions (See PATRAN Plus User Guide 29-17).

Material Types

1 Isotropic 4 TIS option 11 HAL option

2 2D anisotropic 5 TAN option 12 LAM option

3 3D orthotropic 6-7 3D anisotropic 13 MIX option

Material Property Constants

1 		 Reference Temperature (T) 
2 		 Density (RHO) 
3-5 		 Characteristic dimensions (HZ,HY,HX) 
6 		 Structural damping coefficient (GE) 
7 		 Specific heat (CP) 
8 		 Option = material type 
9-14 		 6 Thermal expansion coefficients $(\alpha11,\alpha22,\alpha33,\alpha12,\alpha23,\alpha31)$ 
15-20 		 6 Thermal conductivities (K11,K12,K13,K22,K23,K33) 
21-26 		 2D thermal stress resultants for 1-degree temperature rise
		 (N1,N2,N12,M1,M2,M12)                                        
27-35 		 9 engineering material properties
		 $(E11,E22,E33,\nu12,\nu23,\nu31,G12,G23,G31)$ 
36 		 0 = n/a                                                            
37-57 		 21 material stiffness matrix terms
		 (C11,C12,C13,C22,C23,C33,C44,C45,C46,C55,C56,
		 C66,C14,C15,C16,C24,C25,C26,C34,C35,C36)                                 
58-63 		 6 2D membrane stiffness matrix terms (A11,A12,A13,A22,A23,A33)             
64-69 		 6 2D bending stiffness matrix terms (D11,D12,D13,D22,D23,D33)                
70-78 		 9 2D membrane/bending coupling terms
		 (B11,B12,B13,B21,B22,B23,B31,B32,B33)                                            
79-81 		 Stress limits for tension, compression, and shear (ST,SC,SS)                       
82 		 Emissivity                                                                           
83-96 		 n/a not applicable at present                                                          

There are two methods for entering this material data:

1.

Enter all 96 values at the command line using the `=` character to continue onto a new line.

2.

Read the material definition from a file by typing '@filename' at the command line.