.. _auto_curve_efftotrue:

*CONVERT TRUE-STRESS-VS-STRAIN CURVE BASED FROM EFFECTIVE--STRESS-VS-STRAIN CURVE*
==================================================================================

Converts an effective stress-vs-strain curve to a true stress-vs-strain curve by removing the elastic component using Young's modulus and a plastic-strain offset. Use this worker when material test data is provided in engineering/effective form and a true (Cauchy) stress-strain curve is required for MAT_24 or similar LS-DYNA material cards.

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

Classification: **process**.

Tagged: ``MAT_24``, ``conversion``, ``curve``, ``effective-stress``, ``elastic-offset``, ``material``, ``plastic-strain``, ``stress-strain``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Effective Stress to True
     - effective_stressto_true
     - vector
     - —
     - 
     - Input effective (engineering) stress-vs-strain curve as an (N×2) vector of [strain, stress] pairs (stress in consistent pressure units, strain dimensionless); this is the source curve to be converted.
   * - Youngs Modulus
     - youngs_modulus
     - scalar
     - 1.0
     - 
     - Young's modulus of the material (scalar, same pressure units as the stress values in the curve); used to subtract the elastic strain component — defaults to 1.0, so must be set explicitly to match the curve's stress units (e.g. GPa or MPa).
   * - Offset
     - offset
     - scalar
     - 0.002
     - 
     - Plastic-strain yield offset used in the 0.2%-offset method to locate the yield point (dimensionless strain); defaults to 0.002 (0.2%) and rarely needs to be changed unless a non-standard offset is required.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_efftotrue_output_1
     - curve_efftotrue_output_1
     - vector
     - Resulting true stress-vs-plastic-strain curve as an (N×2) vector of [plastic strain, true stress] pairs, ready for direct use in LS-DYNA MAT_24 or equivalent material definitions.

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

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_efftotrue</code>. Schema hash: <code>c683ca5b0fdd</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
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