Material Property Checks for MAT8
MAT8 only applies to 2D elements.
| Material Requirements | MAT8 |
|---|---|
| Mathematical | If n12*n21 = 1, an error termination will occur. 1 |
| Semi-stability | E1 < 0,
E2 < 0, G12 < 0, G1,Z
< 0, or G2,Z < 0 will result in an error
termination. PARAM,CHECKMAT,NO will disable this error. |
| Not all zeros | If E1 = 0,
E2 = 0 , and G12 = 0, an error termination
will occur. If E1 = 0, E2 = 0 , or G12 = 0, a warning is provided. |
| Consistency | E1*n21 = E2*n12 is assured as only n12 is input. |
| Mathematical for composites | After homogenization, if Det[G] = 0, an error termination will occur. |
Comments
- By substitution of E1*n21 = E2*n12 into n12*n21 = 1, it can be expressed in terms of n12*n12*E2/E1 = 1.