.. _auto_curve_yield_point_treatment:

*TREAT YPE*
===========

Detects and removes the yield-point elongation (Lüders band) discontinuity from a stress–strain curve by applying either an upper or lower treatment strategy. Use this worker to smooth out the upper/lower yield-point drop in engineering or effective stress–strain data before material calibration or MAT_24 fitting.

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

Classification: **process**.

Tagged: ``Luders_band``, ``MAT_24``, ``YPE``, ``curve_smoothing``, ``material_preprocessing``, ``stress_strain``, ``yield_point_treatment``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve
     - curve
     - vector
     - —
     - 
     - Input stress vs. strain curve (vector of paired values) to be treated for yield-point elongation; provide as an engineering or effective stress–strain signal.
   * - Treatment Type
     - treatment_type
     - string
     - lower
     - 
     - Selects whether to retain the upper or lower yield point during treatment — 'upper' preserves the higher stress peak, 'lower' (default) flattens to the lower yield plateau.
   * - Percentage
     - percentage
     - float
     - 0.05
     - 
     - Fractional tolerance (0–1) used to identify the yield-point region; default 0.05 means the algorithm flags stress drops within 5% of the peak as part of the Lüders elongation zone.
   * - Input Type
     - input_type
     - string
     - eng-ss
     - 
     - Specifies whether the input curve is in engineering stress–strain ('eng-ss', default) or effective (true) stress–strain ('eff-ss') convention, controlling any pre/post conversion applied during treatment.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_yield_point_treatment_output_1
     - curve_yield_point_treatment_output_1
     - vector
     - Treated stress–strain curve (vector) with the yield-point elongation discontinuity removed or regularised, ready for downstream material calibration or solver card generation.

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

.. 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_yield_point_treatment</code>. Schema hash: <code>ba9e65219a8e</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>