CONVERT TRUE-STRESS-VS-STRAIN CURVE BASED FROM EFFECTIVE–STRESS-VS-STRAIN CURVE¶
Converts an effective stress-vs-strain curve to a true stress-vs-strain curve by removing the elastic component using Young’s modulus and a plastic-strain offset. Use this worker when material test data is provided in engineering/effective form and a true (Cauchy) stress-strain curve is required for MAT_24 or similar LS-DYNA material cards.
When to use¶
Classification: process.
Tagged: MAT_24, conversion, curve, effective-stress, elastic-offset, material, plastic-strain, stress-strain.
Inputs¶
| Label | ID | Type | Default | Required | Description |
|---|---|---|---|---|---|
| Effective Stress to True | effective_stressto_true | vector | — | Input effective (engineering) stress-vs-strain curve as an (N×2) vector of [strain, stress] pairs (stress in consistent pressure units, strain dimensionless); this is the source curve to be converted. | |
| Youngs Modulus | youngs_modulus | scalar | 1.0 | Young’s modulus of the material (scalar, same pressure units as the stress values in the curve); used to subtract the elastic strain component — defaults to 1.0, so must be set explicitly to match the curve’s stress units (e.g. GPa or MPa). | |
| Offset | offset | scalar | 0.002 | Plastic-strain yield offset used in the 0.2%-offset method to locate the yield point (dimensionless strain); defaults to 0.002 (0.2%) and rarely needs to be changed unless a non-standard offset is required. |
Outputs¶
| Label | ID | Type | Description |
|---|---|---|---|
| curve_efftotrue_output_1 | curve_efftotrue_output_1 | vector | Resulting true stress-vs-plastic-strain curve as an (N×2) vector of [plastic strain, true stress] pairs, ready for direct use in LS-DYNA MAT_24 or equivalent material definitions. |
Disciplines¶
- data.curve.transform
- engineering.material.calibration
- engineering.material.characterization
Runnable example¶
A runnable example is registered for this worker. Open the example workflow on the d3VIEW canvas: /api/workflow/example?id=curve_efftotrue
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