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https://github.com/mrtrkmn/yanki


https://github.com/mrtrkmn/yanki

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README 

        
Running a user-defined material (UMAT) subroutine in Abaqus involves several steps, from setting up the subroutine file to defining a simulation that uses this UMAT. Here's a step-by-step guide to running your UMAT subroutine for Forsterite in Abaqus:



## Step 1: Write the UMAT Subroutine

- Prepare the UMAT Code: Ensure your Fortran code (as we discussed earlier) is correct and ready to be used. Save this code in a file with a .f or .for extension, typically named umat.for.

## Step 2: Compile the UMAT

- Set Up the Compiler: Abaqus UMAT subroutines are generally written in Fortran, and you need a Fortran compiler that is compatible with Abaqus. 



- Install and configure a supported compiler on your system. Common choices include Intel Fortran Compiler and GNU Fortran on Linux.



### Compile the UMAT:



- Open the Abaqus Command window (or a command terminal on Linux).

- Navigate to the directory containing your umat.for.

- Use the Abaqus command to compile the subroutine:



Copy code

```abaqus make library=umat.for```

- This command creates an object file (.obj or .o) and links it into a shared library (umat.dll on Windows or umat.so on Linux) that Abaqus can use.

## Step 3: Set Up Your Abaqus Model

### Create the Abaqus Model:



- Use Abaqus/CAE or your preferred method to set up the finite element model to which you want to apply the UMAT.

- Define the geometry, mesh, and all boundary conditions as usual for your simulation needs.

Material Definition:



- Define a new material in the Material module of Abaqus.

- Under the "Mechanical" menu, choose "User Material" and enter the number of material properties (NPROPS) that your UMAT expects.

Input the material properties in the order expected by your UMAT.

## Step 4: Assign the UMAT to the Material

### Assigning the UMAT:

- Still in the Material definition, point to the UMAT by specifying the name of the library file (e.g., umat.dll or umat.so) under the "Dependent Files" section.

- Ensure the section and material assignments in your model are correctly configured to use this new material definition.

## Step 5: Run the Simulation

### Set Up and Run the Job:

- Create a new job in Abaqus and assign the model you just set up.

- Under the "General" tab of the job, ensure that the path to the UMAT library is correctly specified.

- Submit the job for analysis.

## Step 6: Monitor and Post-Process

### Monitor the Job:



- Use the monitor functionality in Abaqus to check the progress of the simulation.

- Look for any errors in the .log and .sta files that might indicate issues with the UMAT.

## Post-Processing:



Once the simulation is complete, use Abaqus/CAE to review the results.

Check the deformation, stress distributions, and any other results of interest to validate the behavior modeled by your UMAT.

## Troubleshooting



- **Compilation Errors**: Check for syntax errors in your Fortran code.Make sure that all required libraries and dependencies are correctly configured.

- **Runtime Errors:** If Abaqus terminates unexpectedly, review the .dat and .msg files for errors related to the UMAT, such as segmentation faults or incorrect property values.

- **Results Verification:** Compare results with expected outcomes or simpler models to ensure the UMAT is behaving as intended.



By following these steps, you can effectively integrate and use a custom UMAT in Abaqus to simulate complex material behaviors, such as those of Forsterite with anisotropic properties