.. _auto_curve_eng_to_true_strain:

*COMPUTE THE TRUE STRAIN FROM ENG STRAIN*
=========================================

Converts an engineering strain curve to true strain using the standard relationship ε_true = ln(1 + ε_eng). Use this worker when preparing stress-strain data for material model calibration or any analysis requiring logarithmic (true) strain values.

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

Classification: **process**.

Tagged: ``curve_transform``, ``engineering_strain``, ``material_testing``, ``strain_conversion``, ``stress_strain``, ``true_strain``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve
     - curve
     - vector
     - —
     - 
     - Input engineering strain curve (X-axis: engineering strain [dimensionless], Y-axis: any paired quantity such as stress [MPa]); leave unconnected if no transformation is needed.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_eng_to_true_strain_output_1
     - curve_eng_to_true_strain_output_1
     - vector
     - Output curve with the X-axis values converted to true strain via ln(1 + ε_eng); Y-axis values are passed through unchanged.

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

- data.curve.transform
- 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_to_true_strain <https://www.d3view.com/api/workflow/example?id=curve_eng_to_true_strain>`_

.. 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_to_true_strain</code>. Schema hash: <code>729edb834465</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>