Instead of writing *ELEMENT_SHELL_COMPOSITE, you have the option to generate the *ELEMENT_SHELL_BETA output. In this case, you only get one initial material orientation which the application assumes as consistent throughout the thickness during the simulation. You must provide similar input information as the COMPOSITE option output. SHELL_OPTION needs different information, and you must provide information about how to determine the BETA angle. Otherwise, the mapping procedure is similar to the *ELEMENT_SHELL_COMPOSITE option, but the postprocessing prior to the output of the mapped orientation angles is handled differently. Thicknesses are written to the nodes within the *ELEMENT_SHELL_BETA card.
| NPLANE = INT |
1 - Reduced integrated shell elements. 4 - Fully integrated shell elements. |
| NTHICK = INT |
Number of through-thickness integration points in the target mesh. If INT is an even number and SCALARINT is set to CENTER IP, the two integration points closest to the mid-surface are averaged to determine the BETA angle for *ELEMENT_SHELL_BETA output. If INT is an odd number and SCALARINT is set to CENTER IP, the Envyo application uses the mid-point as BETA for output. |
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IntegrationRule = Gauss Lobatto Autoform Moldflow Eq_Distr | Define the through thickness integration rule of the mapping result. This option directly affects the positions of the through thickness integration points on the target mesh. |
| MapStress = NO | Define if *INITIAL_STRESS_SHELL cards are written. For the *ELEMENT_SHELL_COMPOSITE option, this flag must be set to NO. |
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Thck_Avg_Opt = Ele Avg Nodal Avg |
Thickness averaging option. When using *ELEMENT_SHELL_THICKNESS, nodes may hold different thickness information, depending on their parent element. Components with ribs are more likely to be affected by this. When calculating the through-thickness integration points, the Envyo application defaults to using the nodal thicknesses stored on the element nodes, and uses shape functions to interpolate the resulting thicknesses at the in-plane integration points for accurate calculations. The Thck_Avg_Opt=Nodal Avg option collects all thicknesses stored on one node from its attached elements, then averages these thicknesses, and interpolates them to the in-plane integration points using the shape functions. |
| MapMainDir = YES | Activates the mapping of the main directions onto *ELEMENT_SHELL_COMPOSITE cards. |
| TargetThickness = DOUBLE | Define the thickness of the target part. If a SectionFile is included to the source mesh, the application ignores this value. Do not use this option if target mesh already has elements with thickness value. |
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SCALARINT = AVG Center_IP | Define the interpolation method for the transferred fiber orientation angles derived from mapping the orientation tensors. AVG calculates the mean of all the fiber directions assigend to the intergation points through the mapping process. CENTER IP takes the mid-surface integration point information only, or calculates the average of the orientation from the two integration points closest to the mid-surface (see also NTHICK). |
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Shell_Option = Beta | Activates the output of *ELEMENT_SHELL_BETA cards. |
Stress, strain, and thickness mapping are available for 3DTIMON-SHELL mapping. MapStress must be activated for the *INITIAL_STRESS_SHELL output option. To add thickness mapping, you must define a TargetThickness. MapMainDir activates the output of *ELEMENT_SHELL_COMPOSITE keywords carrying the main fiber direction. If special homogenization is necessary, TargetMaterialModel can be either *MAT_157 or *MAT_215.
| INN = INT |
This flag is similar to the invariant node numbering flag in the LS-DYNA application provided in the *CONTROL_ACCURACY card, see [19]. To properly calculate orientations with respect to the element coordinate system, the Envyo program needs information about how the LS-DYNA applications calculates the element coordinate system. The default is similar to LS-DYNA application’s default: Off. |
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MapStress = YES NO | Activates stress mapping. |
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MapThickness = YES NO | Activates thickness mapping. |
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Thck_Avg_Opt = Ele Avg Nodal Avg |
Thickness averaging option. When using *ELEMENT_SHELL_THICKNESS, nodes may hold different thickness information, depending on their parent element. Components with ribs are likely to be affected. In calculating the through-thickness integration points, the Envyo application defaults to using the nodal thicknesses stored on the element nodes, and interpolates the resulting thicknesses at the in-plane integration point(s) using shape functions. This allows for the correct calculation of the local through-thickness integration points. Thck_Avg_Opt=Nodal Avg collects all thicknesses stored on one node from its attached elements, average these thicknesses, and then interpolates them to the in-plane integration points using the shape functions. |
| MapMainDir = YES/NO | Only main orientation is transferred. Output is *ELEMENT_SHELL_COMPOSITE. |
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OUTPUT_OPTION = INITIAL STRESS ONLY |
Only *INITIAL_OPTION cards is written to the mapping result file. Nodes and elements are skipped. |
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TargetMaterialModel = 157 215 |
If not initializing with *ELEMENT_SHELL_COMPOSITE, provide the target material model used in the subsequent analysis. Options are 157 or 215, referring to respective material model IDs in LS-DYNA application’s material model manual [20]. |
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HISV_HANDLING = YES/NO CLEAR | Enables a user-defined way to move and modify history variables. Regarding the meaning of histories, refer to [20] and [4]. If CLEAR, all history variables are removed before generating the result file. If YES, you must define as many history variables as modified. See Equation Parser. |
| MAX_NUM_HISV = INT | Define a new maximum number of history variables. This is an easy way to get rid of unwanted histories that are useless for the new model, but also extends the amount of histories being output. If a history variable is moved to a position which is higher then the actual number of history variables in the input deck, the number of histories is extended automatically. |