The Envyo® application supports two methods to assign material ID (or material properties) according to the source fiber orientation tensor found during the mapping process.
Method 1: Using *ELEMENT_SHELL_COMPOSITE(_LONG)
Since each through-thickness IP of composite elements can have a different material ID, you can define a list of fiber orientation tensors and material ID pairs to assign materials IDs for matching tensors. The following options must be defined:
| NumOriTensorMIDs = INT |
Define the number of material IDs in the target mesh that are considered within the mapping. This option should be followed by OriTensorMID#i definitions. |
| OriTensorMID#i = DOUBLE DOUBLE DOUBLE;INT |
Define as many fiber orientation tensor and material ID pairs as specified in NumOriTensorMIDs. Three double values represent a11, a22 and a33 orientations of the tensor, respectively. The integer value separated by a semicolon represents the material ID signed for this orientation tensor. |
| MapMainDir = YES |
This option must be defined. The output is *ELEMENT_SHELL_COMPOSITE. Fiber orientations are represented by BETA angles for each through thickness IP. |
Method 2: Using *MAT_157 IHIS Option
Independent of the previous options for *MAT_157, you can define IHIS=7 or IHIS=15 to activate fiber orientation-dependent mapping of material properties. *MAT_157 cards must be defined in the target mesh, and can also be added to the target mesh as an include using the *INCLUDE keyword. It is important to note that direction components q1 & q2 and material stiffness parameters Cij will be calculated by the Envyo® application. All parameters mentioned above for the IHIS=3 option should therefore be defined. R00, R45, and R90 values for IHIS=7 and an additional LCSS value for IHIS=15 will be taken from the included *MAT_157 cards. The fiber orientation tensors of material cards must be defined as a material card title using the following format:
EnvyoOrient:DOUBLE;DOUBLE;DOUBLE
Where double values represent the a11, a22 and a33 orientations of the tensor. The material ID will be taken from the material model.
This method can be enhanced to define through-thickness IP material IDs using the *ELEMENT_SHELL_COMPOSITE keyword. The following options should be defined in addition to the options discussed above:
| Shell_Option = Composite | Activates the *ELEMENT_SHELL_COMPOSITE output routine. |
Note that the first method always overrides the second one. To use the enhancements of the second method, MapMainDir option should be either set to NO, or not defined at all.