.. _auto_curves_swift_extrapolate:

*ADD POINTS BY EXTRAPOLATING SWIFT EXTRAPOLATION*
=================================================

Extends an effective stress–strain curve beyond the necking point using Swift power-law extrapolation (σ = C·εⁿ). Provide the true stress–strain curve up to necking, the Swift hardening exponent n, the target end strain, and the desired point count to obtain a smoothly extrapolated output curve suitable for MAT_24 or similar material cards.

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

Classification: **process**.

Tagged: ``curve``, ``extrapolation``, ``hardening``, ``mat_24``, ``material``, ``necking``, ``power-law``, ``stress-strain``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curves To Be Extrapolated
     - curvestobeextrapolated
     - vector
     - —
     - 
     - Effective true stress–strain curve(s) defined up to the necking point (dimensionless strain vs. stress in consistent units); accepts multiple curves.
   * - Swift N
     - swift_n
     - scalar
     - 0.05
     - 
     - Swift power-law hardening exponent n (dimensionless); controls the slope of the extrapolated region — default 0.05 is a typical value for sheet metals.
   * - X End
     - x_end
     - scalar
     - 1.0
     - 
     - Target end strain value (dimensionless, engineering or true strain consistent with input) at which the extrapolated curve terminates; default 1.0.
   * - Number Of Points
     - numberof_points
     - scalar
     - 100
     - 
     - Total number of evenly spaced data points in the extrapolated output curve; default 100 is sufficient for most material card definitions.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curves_swift_extrapolate_output_1
     - curves_swift_extrapolate_output_1
     - vector
     - Extrapolated stress–strain curve(s) extended to x_end via Swift power-law, returned as a vector of (strain, stress) pairs with numberof_points data points.

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

.. raw:: html

   <hr style="margin-top:2em">
   <p style="font-size:11px;color:#888">
   Auto-generated from <code>transformation</code> schema. Worker id: <code>curves_swift_extrapolate</code>. Schema hash: <code>ea10329bbcca</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>