.. _auto_curve_effective_stoughton_yoon:

*COMPUTE THE HARDENING CURVE BASED ON STOUGHTON_YOON FUNCTION*
==============================================================

Computes the effective hardening (flow stress) curve using the Stoughton-Yoon anisotropic hardening function. Given an optional input curve and the five model coefficients (A, B, C, D, H), it generates a stress vs. plastic-strain curve over a user-defined strain range and increment. Use this worker when calibrating or extending a material hardening law for sheet-metal forming simulations.

When to use
-----------

Classification: **process**.

Tagged: ``anisotropic_hardening``, ``effective_stress``, ``flow_stress``, ``hardening_curve``, ``material_calibration``, ``plasticity``, ``sheet_metal``, ``stoughton_yoon``.

Inputs
------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20 20 20

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve In
     - curve_in
     - vector
     - —
     - 
     - Optional seed curve (strain vs. stress vector) to extend or override; leave empty to generate the hardening curve purely from the analytical Stoughton-Yoon parameters.
   * - A
     - a
     - scalar
     - 0.0
     - 
     - Stoughton-Yoon coefficient A (stress units consistent with model, e.g. MPa); default 0.0.
   * - B
     - b
     - scalar
     - 0.0
     - 
     - Stoughton-Yoon coefficient B (stress units consistent with model, e.g. MPa); default 0.0.
   * - C
     - c
     - scalar
     - 0.0
     - 
     - Stoughton-Yoon coefficient C (dimensionless exponent or stress scaling term); default 0.0.
   * - D
     - d
     - scalar
     - 0.0
     - 
     - Stoughton-Yoon coefficient D (dimensionless exponent or stress scaling term); default 0.0.
   * - H
     - h
     - scalar
     - 0.0
     - 
     - Stoughton-Yoon anisotropy coefficient H (dimensionless); default 0.0.
   * - Last Strain
     - last_strain
     - scalar
     - 1.0
     - 
     - Maximum effective plastic strain at which the output curve is evaluated; default 1.0.
   * - Increment
     - increment
     - scalar
     - 0.001
     - 
     - Strain step size used to discretize the output curve from zero to last_strain; default 0.001 (1000 points at default last_strain).

Outputs
-------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20

   * - Label
     - ID
     - Type
     - Description
   * - curve_effective_stoughton_yoon_output_1
     - curve_effective_stoughton_yoon_output_1
     - vector
     - Computed effective hardening curve as a (plastic strain, flow stress) vector spanning [0, last_strain] at the specified increment, ready for use as a material input in forming or crash simulations.

Disciplines
-----------

- data.curve.transform
- engineering.manufacturing
- 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_effective_stoughton_yoon <https://www.d3view.com/api/workflow/example?id=curve_effective_stoughton_yoon>`_

.. raw:: html

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_effective_stoughton_yoon</code>. Schema hash: <code>20b1a9c1bf3a</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
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