.. _auto_curve_efftoengstress:

*TRUE TO ENG*
=============

Converts an effective (true) stress–strain curve to an engineering stress–strain curve in two steps: effective → true (using elastic modulus and yield offset), then true → engineering (using Poisson's ratio and tension/compression convention). Use this worker when you need engineering stress–strain data from a von-Mises effective stress curve, e.g. for MAT_24 input preparation.

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

Classification: **process**.

Tagged: ``MAT_24``, ``conversion``, ``curve_transform``, ``effective_stress``, ``engineering_stress``, ``material_characterization``, ``stress_strain``, ``true_stress``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Effective Stress Vs Strain Curve
     - effectivestressstraincurve
     - vector
     - —
     - 
     - Input effective (von-Mises true) stress vs. strain curve as a vector of (strain, stress) pairs; this is the raw true stress–strain data to be converted.
   * - Modulus
     - slope
     - scalar
     - 210
     - 
     - Elastic (Young's) modulus in GPa used to separate elastic and plastic strain during the effective-to-true conversion; defaults to 210 GPa (steel).
   * - Yield Offset
     - offset
     - scalar
     - 0.0002
     - 
     - Yield offset strain used to locate the yield point on the curve during the effective-to-true conversion; defaults to 0.0002 (0.02% offset convention).
   * - Poisson's Ratio
     - poissons_ratio
     - scalar
     - 0
     - 
     - Poisson's ratio applied during the true-to-engineering conversion to account for lateral strain; set to 0 (default) to ignore lateral contraction effects.
   * - Tension/Compression Flag
     - tension_compression_flag
     - text
     - tension
     - 
     - Indicates whether the curve represents a tension or compression test; controls sign convention in the true-to-engineering transformation — select 'tension' (default) or 'compression'.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_efftoengstress_output_1
     - curve_effoengstress_output_1
     - vector
     - Resulting engineering stress vs. strain curve as a vector of (strain, stress) pairs, ready for downstream material card authoring or characterization workflows.

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

.. raw:: html

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_efftoengstress</code>. Schema hash: <code>80fc0dc4d7a0</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>