DROP TOWER SPECIMEN GENERATOR¶
Generates a parameterized LS-DYNA drop-tower biaxial specimen deck for sheet-metal material testing. Given a specimen geometry (diameter, impactor sphere size, mesh density), sheet thickness, and shell-element settings, it produces a ready-to-run keyword file that can be fed directly into a drop-tower calibration or failure workflow.
When to use¶
Classification: data.
Tagged: biaxial, coupon, drop_tower, elform, keyword, ls-dyna, mat_calibration, mesh.
Inputs¶
| Label | ID | Type | Default | Required | Description |
|---|---|---|---|---|---|
| Choose Specimen Type | type | string | droptower_37p5mmdia_12p6sphere_p7mm_mesh | Specimen geometry template to use; choose between the 37.5 mm-diameter and 28.575 mm-diameter circular blanks, both paired with a 12.6 mm-sphere impactor at 0.7 mm nominal mesh size — default is the 37.5 mm variant. | |
| Specimen Thickness | specimen_thickness | scalar | 1 | Sheet-metal blank thickness (mm) matching the physical coupon used in the drop-tower test; default is 1.0 mm. | |
| Drop Thickness | drop_specimen_thickness | scalar | 0.5 | Thickness (mm) assigned to the drop-tower impactor/striker solid or shell elements; default is 0.5 mm. | |
| Specimen Elform | elform | scalar | 16 | LS-DYNA shell element formulation (ELFORM) applied to the specimen mesh; default is 16 (fully-integrated shell), consistent with most stamped-metal calibration decks. | |
| Specimen NIP | ni_p | scalar | 5 | Number of through-thickness integration points (NIP) for the shell section; default is 5, which is standard for capturing bending-dominated plasticity in sheet metal. | |
| Membrane Thinning | membrane_thinning | scalar | 0 | LS-DYNA *CONTROL_SHELL ISTUPD flag controlling membrane-thinning updates; 0 = off (default), 1 = on — enable when accurate thickness evolution under large plastic strains is required. | |
| Duration | duration | scalar | 100 | Simulation termination time (ms or model time units) for the drop-tower event; sets the *CONTROL_TERMINATION end-time in the generated keyword deck. | |
| Mass-Scaled Time Step | mass-scaled_time_step | scalar | 0 | Mass scaling time step | |
| Binary Output Frequency | dtbi_n | scalar | 1 | D3PLOT frequency | |
| ASCII Output Frequency | ascii_output_frequency | scalar | 0.1 | ||
| Specimen Material ID | specimen_mid | scalar | — | Material ID that matches with the material data specified in the next field | |
| Material Data | material_data | text | — | Material Card | |
| Nf Specimen Mid | nf_specimen_mid | scalar | — | Material ID that matches with the material data specified in the next field | |
| No-failure Material Data | nf_specimen_material_data | text | — | No-failure Material Card | |
| Ssf | ssf | scalar | 1 | Default hole size is 37.5 mm. You can scale this using this scale factor. Please note the mesh length will change so this factor is assumed to be small to match the tolerances in the test | |
| Dsf | dsf | scalar | 1 | Default diameter size is 12.6 mm. You can scale this using this scale factor. Please note the mesh length will change so this factor is assumed to be small to match the tolerances in the test | |
| Additional Keywords | additionalkeywords | text | *COMMENT | Add additional keywords (Optional) |
Outputs¶
| Label | ID | Type | Description |
|---|---|---|---|
| material_specimen_generator_uniaxial_output_1 | material_specimen_generator_uniaxial_output_1 | text | LS-DYNA keyword (.k) file containing the fully parameterized drop-tower specimen deck — geometry, section, boundary conditions, and control cards — ready for solver submission or downstream material-calibration workers. |
Disciplines¶
- cae.preprocessing.deck_authoring
- engineering.material.calibration
- engineering.material.specimen
Auto-generated from transformation schema. Worker id: material_specimen_generator_drop_tower. Schema hash: 4f871f69c9f0. Hand-curated docs in workerexamples/ override this page when present.