.. _auto_curve_effective_swift:

*COMPUTE THE EXTRAPOLATION BASED ON SWIFT EXPONENTS*
====================================================

Extrapolates a stress–strain curve beyond the measured necking point using the Swift power-law hardening model. Given an input true stress–strain curve, a Swift exponent n, a target last strain, and a strain increment, it returns the extended curve. Use this worker to prepare flow-stress data for LS-DYNA MAT_24 or similar material cards that require extrapolated hardening behaviour.

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

Classification: **process**.

Tagged: ``effective_strain``, ``extrapolation``, ``flow-stress``, ``hardening``, ``mat_24``, ``necking``, ``power-law``, ``stress-strain``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve In
     - curve_in
     - vector
     - —
     - 
     - Input true stress–strain (or engineering) curve to be extrapolated; typically the measured test data up to necking onset (dimensionless strain vs. stress in MPa or consistent units).
   * - Exponent
     - exponent
     - scalar
     - 0.0
     - 
     - Swift hardening exponent n (dimensionless); controls the slope of the power-law extrapolation beyond the measured data — default 0.0 uses the necking strain as the reference point.
   * - Last Strain
     - last_strain
     - scalar
     - 1.0
     - 
     - Target end value of the effective plastic strain at which the extrapolated curve is terminated (dimensionless); default 1.0, increase for large-deformation applications.
   * - Increment
     - increment
     - scalar
     - 0.001
     - 
     - Strain step size used when building the extrapolated portion of the curve (dimensionless); default 0.001 — reduce for smoother output or increase for faster computation on coarse curves.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_effective_swift_output_1
     - curve_effective_swift_output_1
     - vector
     - Extended true stress–strain curve with the Swift power-law extrapolation appended beyond the last measured data point, returned as an (effective plastic strain, true stress) vector ready for material card input.

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

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_effective_swift</code>. Schema hash: <code>b2e4e332e51b</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
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