LSDYNA SPOTWELD FAILURE ANALYSIS (DAIMLER-CHRYSLER)¶
Computes Daimler-Chrysler spotweld damage-ratio time-history from an LS-DYNA swforc (binout) output. Implements the MAT_SPOTWELD_DAIMLERCHRYSLER failure surface DR(t) = (max(0,Fn)/Fnf)^EXSN + (Fs/Fsf)^EXSS + (Fb/Fbf)^EXSB, where Fn/Fs/Fb are the axial / shear / bending histories from the binout and Fnf/Fsf/Fbf are the user-supplied capacities. DR(t) >= 1 marks failure. Returns per-spotweld DR + FOS curves, the time of peak DR, and a per-spotweld minimum-FOS summary suitable for downstream charting or report generation.
When to use¶
Tagged: binout, daimler_chrysler, damage_ratio, dc, factor_of_safety, failure, fos, lsdyna.
Inputs¶
| Label | ID | Type | Default | Required | Description |
|---|---|---|---|---|---|
| Simulation | simulation_id | remote_lookup | — | Reference to the LS-DYNA simulation whose binout swforc data will be read. | |
| Spotweld IDs | spotweld_ids | string | — | Comma-separated list of swforc spotweld IDs to analyze. Leave empty to analyze every spotweld in swforc. | |
| Normal Capacity (Fnf) | sn_capacity | float | 0 | Normal (tension) failure capacity Fnf in force units consistent with the binout (lbf or N). Compression is ignored (tension-only). Set to 0 to skip the normal term. | |
| Shear Capacity (Fsf) | ss_capacity | float | 0 | Shear failure capacity Fsf in force units consistent with the binout. Set to 0 to skip the shear term. | |
| Bending Capacity (Fbf) | sb_capacity | float | 0 | Bending failure capacity Fbf in moment units consistent with the binout. Set to 0 (or leave at 0) when swforc does not provide a moment channel. | |
| Normal Exponent (EXSN) | exsn | float | 2.0 | Daimler-Chrysler normal-term exponent (LS-DYNA EXSN). Default 2.0. | |
| Shear Exponent (EXSS) | exss | float | 2.0 | Daimler-Chrysler shear-term exponent (LS-DYNA EXSS). Default 2.0. | |
| Bending Exponent (EXSB) | exsb | float | 2.0 | Daimler-Chrysler bending-term exponent (LS-DYNA EXSB). Default 2.0. |
Outputs¶
| Label | ID | Type | Description |
|---|---|---|---|
| DR Results | dr_results | dataset | Per-spotweld DR + FOS time-history plus min-FOS / peak-DR summary. Indexed by spotweld ID. |
| Summary | summary | dataset | Capacities, exponents, total spotweld count, failed-spotweld count, and per-spotweld peak-DR rows (sorted by peak DR descending). Suitable for tabular reporting. |
Disciplines¶
- cae.postprocessing.extraction
- cae.postprocessing.response
- engineering.spotweld.analysis
- engineering.structural.welded_joint
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