Convert Abaqus .inp file to Calculix

Converting an Abaqus input file (.inp) to a Calculix input file (.inp) requires manual intervention and some understanding of both software’s syntax. There is no automatic conversion tool available.

Here’s a step-by-step guide on how to approach this conversion, along with common issues and solutions:

1. Understand the Key Differences

• Element Types: While Abaqus and Calculix support similar element types, there might be slight variations in naming or defining them.
• Material Models: While both software support a wide range of material models, there could be differences in how specific parameters are defined or even availability of specific models.
• Boundary Conditions: The syntax for defining boundary conditions in Abaqus and Calculix is different.
• Loading: The syntax for defining loads and constraints is also different.
• Output: Calculix uses a different output format compared to Abaqus.

2. Manual Conversion Process

1. Open the Abaqus input file (.inp) in a text editor.
2. Examine the Abaqus input file for the following sections:
   • Header: This section defines the analysis type, units, and other general settings.
   • Nodes: Contains the definition of all nodes in the model.
   • Elements: Defines the elements and their connectivity.
   • Materials: Defines the material properties.
   • Boundary Conditions: Defines constraints and boundary conditions.
   • Loads: Defines the applied loads on the model.
   • Output: Defines the output requested from the analysis.
3. Convert each section of the Abaqus input file to Calculix syntax.

Example Conversion:

Abaqus Syntax:

*Node
1, 0, 0, 0
2, 1, 0, 0
3, 1, 1, 0

*Element, type=C3D8
1, 1, 2, 3, 4, 5, 6, 7, 8

Calculix Syntax:

*NODE
1, 0, 0, 0
2, 1, 0, 0
3, 1, 1, 0

*ELEMENT, TYPE=C3D8
1, 1, 2, 3, 4, 5, 6, 7, 8

3. Common Issues and Solutions:

• Material Models: If Abaqus uses a material model that Calculix doesn’t support, you might need to find a suitable alternative model in Calculix.
• Boundary Conditions: Use the Calculix documentation to learn the syntax for defining boundary conditions.
• Loading: The syntax for defining loads in Calculix can be quite different from Abaqus. Make sure to refer to the Calculix documentation.
• Output: Calculix output is typically written in text format. You may need to use a post-processing tool to visualize the results.

4. Test and Validate

• Run the converted Calculix input file (.inp) and compare the results with the Abaqus analysis.
• Iterate and refine the conversion process until you achieve satisfactory results.

5. Tools for Assistance:

While there’s no automatic conversion tool, you can use these resources:

• Calculix Documentation: The official Calculix documentation is the most reliable resource for understanding its syntax and functionalities.
• Online Forums: Many forums and online communities dedicated to finite element analysis can provide valuable guidance and assistance during the conversion process.
• Online guideline.

Important Considerations:

• Complexity: The conversion process becomes more complex for models with intricate geometries, advanced material models, or complicated loading scenarios.
• Debugging: Expect to spend time debugging the converted Calculix input file to ensure it runs correctly.

Conclusion:

Converting an Abaqus input file to Calculix requires a manual approach with careful attention to syntax differences and feature variations. By understanding the differences between the two software and following the steps outlined above, you can successfully convert your input files and utilize Calculix for your analysis needs.

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