COMPUTE VARIANCE BASED ON SCALES¶
Scales an engineering stress-strain curve by applying deviation scales to key parameters (slope/elastic modulus and yield offset) to generate a variance curve. Use this worker when exploring material property scatter or building upper/lower bound stress-strain curves from a nominal baseline.
When to use¶
Classification: process.
Tagged: elastic_modulus, engstress, material_curve, necking, scaling, stress_strain, variance, yield_offset.
Inputs¶
| Label | ID | Type | Default | Required | Description |
|---|---|---|---|---|---|
| Eng Stress Strain Curve | eng_stress_strain_curve | vector | — | Nominal engineering stress-strain curve (vector of strain-stress pairs) to be scaled; serves as the baseline from which the variance curve is derived. | |
| Scales | scales | keyvalue | 0 | Key-value map of deviation scale factors applied to material parameters (e.g., stress scale, strain scale); leave at default 0 for no scaling. | |
| Slope | slope | scalar | 0 | Elastic modulus (slope of the linear elastic region, e.g. in MPa or GPa); used to anchor the scaled curve’s initial stiffness — leave at 0 to inherit slope from the input curve. | |
| Offset | offset | scalar | 0 | Yield offset value (dimensionless strain, typically 0.002 for 0.2% proof stress); used to shift the yield point when generating the variance curve — leave at 0 for no offset. | |
| Scale After Necking | scale_after_necking | scalae | yes | Flag (‘yes’/’no’) controlling whether scaling is applied to the post-necking region of the curve; default ‘yes’ allows full-curve variance generation. | |
| Elastic Treatment | elastic_treatment | scalar | scale_stress | How the elastic region is treated when the yield stress is scaled. ‘Scale stress’ keeps the original yield strain, so the elastic slope E differs per variant. ‘Scale yield along modulus E’ moves the yield point along the same elastic line, so every variant shares one elastic modulus. | |
| Clamp Yield Below Ultimate | clamp_yield_to_ultimate | scalar | no | When Yes, if a scaled variant’s yield stress would reach or exceed its ultimate stress, the yield is clamped just below the ultimate so every generated curve keeps yield < ultimate. | |
| Yield-to-Ultimate Stress Transition | stress_transition | scalar | cap | How stress between yield and ultimate is scaled. ‘Blend scale factors’ blends the yield and ultimate scale factors across the strain range (existing behavior). ‘Smooth yield-to-ultimate remap’ remaps each point’s stress onto the scaled yield-to-ultimate band by its original position between yield and ultimate, so every variant transitions smoothly from its scaled yield to its scaled ultimate. |
Outputs¶
| Label | ID | Type | Description |
|---|---|---|---|
| curve_engstress_scale_by_scales_output_1 | curve_engstress_scale_by_scales_output_1 | vector | Scaled engineering stress-strain variance curve (vector of strain-stress pairs) generated by applying the specified deviation scales, slope, and offset to the input baseline curve. |
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_engstress_scale_by_scales
Auto-generated from transformation schema. Worker id: curve_engstress_scale_by_scales. Schema hash: 70a8a6e2c9f8. Hand-curated docs in workerexamples/ override this page when present.