.. _auto_curve_eng_strain_to_plastic:

*COMPUTE ENG STRAIN TO EFFECTIVE PLASTIC STRAIN*
================================================

Converts an engineering stress-strain curve to effective plastic strain by subtracting the elastic component using the provided elastic modulus. Use this worker when preparing true/plastic strain data for material card calibration (e.g., MAT_24) from raw coupon test results.

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

Classification: **process**.

Tagged: ``MAT_24``, ``coupon``, ``curve_transform``, ``elastic_modulus``, ``eng_strain``, ``material_calibration``, ``plastic_strain``, ``stress_strain``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Eng Stress Strain Curve
     - eng_stress_strain_curve
     - vector
     - —
     - 
     - Engineering stress-strain curve (2-column vector: strain vs. stress, typically in GPa or MPa); the raw coupon test curve from which plastic strain will be derived.
   * - Elastic Modulus
     - elastic_modulus
     - scalar
     - 210
     - 
     - Young's modulus of the material in GPa used to compute the elastic strain offset; defaults to 210 GPa (steel) — change for aluminium or other alloys.
   * - Strain
     - strain
     - scalar
     - —
     - 
     - Optional scalar strain value at which to evaluate or offset the plastic strain calculation; leave blank to process the full curve.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_eng_strain_to_plastic_output_1
     - curve_eng_strain_to_plastic_output_1
     - scalar
     - Effective plastic strain scalar (or curve) computed by subtracting the elastic strain component (σ/E) from the engineering strain at each point.

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_eng_strain_to_plastic <https://www.d3view.com/api/workflow/example?id=curve_eng_strain_to_plastic>`_

.. raw:: html

   <hr style="margin-top:2em">
   <p style="font-size:11px;color:#888">
   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_eng_strain_to_plastic</code>. Schema hash: <code>a98c0e8ae8f7</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>