.. _auto_curve_engtotruestress:

*ENGINEERING STRESS VS STRAIN CURVE TO TRUE STRESS VS STRAIN CURVE USING CONSTANT VOLUME ASSUMPTION*
====================================================================================================

Converts an engineering stress–strain curve to a true stress–strain curve using the constant-volume (incompressibility) assumption. Supports uniaxial tension, compression, and anisotropic tension loading types, and can convert either or both axes independently.

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

Classification: **process**.

Tagged: ``anisotropic``, ``compression``, ``constant_volume``, ``curve_transform``, ``engineering_stress``, ``incompressibility``, ``material_conversion``, ``poissons_ratio``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Engineering Stress Strain Curve
     - engineeringstressstraincurve
     - vector
     - —
     - 
     - Engineering stress vs. strain input curve (X = engineering strain [mm/mm], Y = engineering stress [MPa]); the primary curve to be converted to true stress–strain.
   * - Axis
     - axis
     - string
     - both
     - 
     - Axis or axes to convert: 'both' converts engineering strain→true strain (X) and engineering stress→true stress (Y); 'x' converts strain axis only; 'y' converts stress axis only; defaults to 'both'.
   * - Poissons Ratio
     - poissons_ratio
     - scalar
     - 0.0
     - 
     - Poisson's ratio (dimensionless, 0–0.5) used to account for volumetric compressibility; default 0.0 corresponds to the strict constant-volume (incompressible) assumption.
   * - Loading Type
     - loading_type
     - string
     - tension
     - 
     - Loading regime: 'tension' (default uniaxial), 'compression', or 'tension_anisotropic' (anisotropic strains — requires lateral and transversal strain curves to also be provided).
   * - Eng Stress Vs Transversal Strain
     - eng_ss_vs_transversal_strain
     - vector
     - —
     - 
     - Engineering stress as a function of transversal strain curve (X = transversal strain [mm/mm], Y = engineering stress [MPa]); required only when loading_type is 'tension_anisotropic'.
   * - Eng Stress Vs Thickness Strain
     - eng_ss_vs_thickness_strain
     - vector
     - —
     - 
     - Eng stress provided as function of thickness strain   <a class='btn btn-xs btn-default' target='_blank' href='https://www.d3view.com/docs/master/workflows/Glossary.html#curveinput'> <i class='fa fa-external-link'> </i> View more </a>

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_engtotruestress_output_1
     - curve_engtotruestress_output_1
     - vector
     - Converted true stress vs. true strain curve (X = true strain [mm/mm], Y = true stress [MPa]), computed from the input engineering curve using the selected axis, loading type, and Poisson's ratio settings.

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

.. 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_engtotruestress</code>. Schema hash: <code>c311afef3a51</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>