Enable optional prescribed initial prestretch#1900
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tuchpaul wants to merge 1 commit into4C-multiphysics:mainfrom
Open
Enable optional prescribed initial prestretch#1900tuchpaul wants to merge 1 commit into4C-multiphysics:mainfrom
tuchpaul wants to merge 1 commit into4C-multiphysics:mainfrom
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Pull request overview
This PR adds support for an optional, user-provided initial prestretch tensor as the starting point for the IterativePrestress strategy, with identity as a default when not specified.
Changes:
- Add
PRESTRETCHas an optionalInterpolatedInputField<SymmetricTensor<...>>parameter forMIX_Prestress_Strategy_Iterative, defaulting to the identity tensor. - Extend
Core::IO::InputSpecBuildersto support optional selections and default values for (interpolated) input fields. - Add
value_typealias to generalized input fields to enable default-value plumbing in specs.
Reviewed changes
Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.
Show a summary per file
| File | Description |
|---|---|
| src/mixture/src/4C_mixture_prestress_strategy_iterative.hpp | Adds a stored initial prestretch input field parameter to the iterative prestress strategy parameters. |
| src/mixture/src/4C_mixture_prestress_strategy_iterative.cpp | Uses the initial prestretch field as the starting value in evaluate_prestress(). |
| src/global_legacy_module/4C_global_legacy_module_validmaterials.cpp | Registers PRESTRETCH as an optional material input with identity default for the iterative prestress strategy. |
| src/core/io/src/4C_io_input_spec_builders.hpp | Adds optional/required + defaulting support for selections and (interpolated) input fields. |
| src/core/io/src/4C_io_input_field.hpp | Exposes value_type needed by spec builders’ default-value handling. |
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amgebauer
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Mar 30, 2026
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This PR introduces support for a predefined prestretch as the starting point for the IterativePrestress algorithm.
The predefined prestretch can be provided as an interpolated input field. To make this initial prestretch optional, the possibility to set default values for both the interpolated input field and the selection have been implemented.
The new test cases covers the new feature and represents the prestressing performed in paragraph 2.6 in
https://doi.org/10.1016/j.jmbbm.2023.105733.