.. _auto_curve_forcedeflectiontotruestressstrain:

*CONVERT A FORCE-DEFLECTION CURVE TO A TRUE STRESS VS STRAIN CURVE BASED*
=========================================================================

Converts a force-deflection (force-displacement) curve into a true stress vs. true strain curve using the specimen's gauge length and initial cross-sectional area. Use this worker during material characterization workflows to transform raw coupon test data into the true stress-strain representation required for material card calibration.

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

Classification: **process**.

Tagged: ``coupon``, ``cross-section``, ``force-deflection``, ``gauge-length``, ``material-testing``, ``stress-strain-conversion``, ``true-strain``, ``true-stress``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Force Deflection Curve
     - forcedeflectioncurve
     - vector
     - —
     - 
     - Input force-displacement curve (X: displacement in length units, Y: force in force units) obtained from a physical coupon test; leave unconnected only if the curve is supplied via another mechanism.
   * - Length
     - length
     - float
     - 1
     - 
     - Gauge length of the specimen in consistent length units (e.g. mm); used to compute engineering strain as displacement / gauge length — defaults to 1.0 if the curve is already in strain units.
   * - Area
     - area
     - float
     - 1
     - 
     - Initial cross-sectional area of the specimen at the gauge section in consistent area units (e.g. mm²); used to compute engineering stress as force / area — defaults to 1.0 if the curve is already in stress units.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - True Stress vs Strain
     - true_stress_vs_strain
     - vector
     - Resulting true stress vs. true strain curve (X: true strain dimensionless, Y: true stress in the same pressure units as force/area), ready for use in material card calibration or GISSMO fitting.

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

- data.curve.transform
- engineering.material.characterization
- engineering.material.specimen

Runnable example
----------------

A runnable example is registered for this worker. Open the example workflow on the d3VIEW canvas: `/api/workflow/example?id=curve_forcedeflectiontotruestressstrain <https://www.d3view.com/api/workflow/example?id=curve_forcedeflectiontotruestressstrain>`_

.. 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_forcedeflectiontotruestressstrain</code>. Schema hash: <code>eaf8a192131d</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>