COMPUTES EFFECTIVE STRAIN AT DEVIATION¶
Computes the effective (true) strain at the point where a simulated engineering stress-strain curve first deviates significantly from a reference test curve. Use this worker to quantify the onset-of-deviation strain between simulation and physical test data for material characterization or calibration workflows.
When to use¶
Classification: process.
Tagged: deviation, effective_strain, engineering_ss, material_characterization, offset_method, sim_vs_test, stress_strain, yield.
Inputs¶
| Label | ID | Type | Default | Required | Description |
|---|---|---|---|---|---|
| Sim Eng SS Curves | curve_1 | vector | — | Simulated engineering stress-strain curve(s) (vector/multi-curve); typically output from an LS-DYNA or equivalent solver run — accepts multiple curves for batch processing. | |
| Test Eng SS Curves | curve_2 | vector | — | Reference physical-test engineering stress-strain curve(s) (vector) against which the simulation curves are compared to detect deviation. | |
| Slope | slope | scalar | 210 | Elastic modulus used to construct the offset yield line (GPa or matching stress-axis units; default 210 GPa for steel); set to 0.0 to have the value computed automatically from the curve data. | |
| Yield Type | threshold | scalar | offset | Numeric value associated with the selected yield method (dimensionless strain offset; default 0.0002 = 0.2% offset); adjust according to the material standard being applied. | |
| Yield Type Value | threshold | scalar | 0.0002 | Numeric value associated with the selected yield method (dimensionless strain offset; default 0.0002 = 0.2% offset); adjust according to the material standard being applied. | |
| Compute the Deviation after this value | x_after | scalar | 0.0 | Strain value below which curve data is ignored when searching for deviation (dimensionless; default 0.0 = consider full curve); increase to skip the elastic region or initial noise. | |
| Ratio of Max | percent_max | scalar | 0.05 | Deviation sensitivity threshold expressed as a fraction of the maximum absolute difference between the two curves (dimensionless; default 0.05 = 5%); lower values flag deviation earlier, higher values tolerate more divergence. | |
| Search from End | from_end | scalar | no |
Outputs¶
| Label | ID | Type | Description |
|---|---|---|---|
| Eff Strain at Deviation | curves_get_eff_strain_at_deviation | dataset | Dataset containing the computed effective strain value(s) at the first detected deviation point between the simulated and test stress-strain curves, one row per curve pair. |
Disciplines¶
- data.correlation
- data.curve.pair
- 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=curves_get_eff_strain_at_deviation
Auto-generated from transformation schema. Worker id: curves_get_eff_strain_at_deviation. Schema hash: 813eeb41c38a. Hand-curated docs in workerexamples/ override this page when present.