.. _auto_curve_true_to_eng_strain:

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

Converts a true strain vs. time curve to engineering strain using the standard relationship ε_eng = exp(ε_true) − 1. Use this worker when material test data is recorded in true strain and a downstream process (e.g., MAT_24 card authoring) requires engineering strain.

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

Classification: **process**.

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

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - True Strain Vs Time Curve
     - truestrainvstimecurves
     - vector
     - —
     - 
     - True strain vs. time curve (dimensionless strain on Y-axis, time in seconds on X-axis) obtained from a material coupon test; leave unconnected if no conversion is needed.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_truetoengstrain_output_1
     - curve_truetoengstrain_output_1
     - vector
     - Engineering strain vs. time curve (dimensionless) derived from the input true strain curve via ε_eng = exp(ε_true) − 1; shares the same time axis as the input.

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

.. raw:: html

   <hr style="margin-top:2em">
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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_true_to_eng_strain</code>. Schema hash: <code>0b41c7b0ccbc</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>