.. _auto_curve_engstress_variance_scales: *COMPUTE SCALES USING THE STANDARD VARIANCE OF YIELD, ULTIMATE AND FAILURE STRESS* ================================================================================== Computes stress-scaling factors from the standard variance of quasi-static yield, ultimate, and failure stress bounds relative to a reference engineering stress–strain curve. Given min/max ranges for each stress milestone and optional elastic modulus and yield offset, it returns a key-value set of deviation scales suitable for downstream material calibration or scatter analysis. When to use ----------- Classification: **process**. Tagged: ``curve_transformation``, ``deviation``, ``engineering_stress_strain``, ``failure_stress``, ``material_scatter``, ``quasi_static``, ``scatter``, ``ultimate_stress``. Inputs ------ .. list-table:: :header-rows: 1 :widths: 20 20 20 20 20 20 * - Label - ID - Type - Default - Required - Description * - Quasi-Static Eng Stress Strain Curve - quasi-static_eng_stress_strain_curve - vector - — - - Reference quasi-static engineering stress–strain curve (vector of stress-strain pairs) against which variance-based scales are computed; leave empty only if all min/max bounds fully define the scatter range. * - QS Yield Stress Min - qs_yield_stress_min - scalar - 0 - - Minimum quasi-static yield stress value (stress units consistent with the curve, e.g. MPa); defaults to 0 — set to the lower-bound yield stress from material data sheets. * - QS Yield Stress Max - qs_yield_stress_max - scalar - 0 - - Maximum quasi-static yield stress value (same units as qs_yield_stress_min); defaults to 0 — set to the upper-bound yield stress from material data sheets. * - QS Ultimate Stress Min - qs_ultimate_stress_min - scalar - 0 - - Minimum quasi-static ultimate tensile stress (MPa); defaults to 0 — set to the lower-bound UTS from coupon test data. * - QS Ultimate Stress Max - qs_ultimate_stress_max - scalar - 0 - - Maximum quasi-static ultimate tensile stress (MPa); defaults to 0 — set to the upper-bound UTS from coupon test data. * - QS Elongation Strain Min - qs_elongation_strain_min - scalar - 0 - - Minimum quasi-static elongation-at-failure strain (dimensionless or %); defaults to 0 — maps to the failure_min argument driving the failure-stress deviation scale. * - QS Elongation Strain Max - qs_elongation_strain_max - scalar - 0 - - Maximum quasi-static elongation-at-failure strain (dimensionless or %); defaults to 0 — maps to the failure_max argument driving the failure-stress deviation scale. * - Elastic Modulus - elastic_modulus - scalar - 0 - - Elastic (Young's) modulus of the material (GPa or MPa, consistent with curve units); used as the slope argument to correctly locate the yield point on the stress–strain curve; defaults to 0 (auto-detected from curve slope if available). * - Yield Offset - yield_offset - scalar - 0.002 - - Outputs ------- .. list-table:: :header-rows: 1 :widths: 20 20 20 20 * - Label - ID - Type - Description * - curve_engstress_variance_scales_output_1 - curve_engstress_variance_scales_output_1 - keyvalue - Key-value collection of deviation scale factors (e.g. yield_min_scale, yield_max_scale, ultimate_min_scale, …) derived from the standard variance of yield, ultimate, and failure stress bounds; consumed by material calibration or DOE scatter workers. Disciplines ----------- - data.curve.transform - data.statistics - 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_variance_scales `_ .. raw:: html

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