The calibration of a UANISOHYPER_STRAIN usersub will be available in R2026x FD02.
The image above is to draw your attention to an Abaqus Verification manual section. In that section there is a user-subroutine file named uanisohyper_inv.f That file also contains a uanisohyper_strain subroutine that mimics the Abaqus native Fung Orthotropic model.
Starting files from Verification manual:
uanisohyper_inv.f : extract just the uanisohyper_strain part and rename file to uanisohyper_strain.for
uaniso_inv_fung.inp : extract the part related to using the uanisohyper_strain usersub and rename to uaniso_strain_fung.inp
The material model in that .inp file looks like this: The units are MKS.
*********************************
*material,name=uaniso_strain
*anisotropic hyperelastic, definition=user, formulation=strain, type=compressible, properties=11
0.9925, 0.0749, 0.4180, 0.0295, 0.0193, 0.0089, 5.0, 5.0
5.0, 26.95e3, 1e-8
*********************************
Run Abaqus outside the platform using those files and extract the (time, U1) response. The load is a cload.
This test data file is named test_data_U1.txt
Create the StandardU.dll file using:
Abq2026 make -library uanisohyper_strain.for
The video below shows how to set up a calibration of this user subroutine. It uses FE mode. This video was made using a development version of the Material Calibration App
The zip file below contains all the files mentioned above.
