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# OOF2 and Abaqus

### Microstructure FEA by OOF2 and Abaqus

• OOF2 is a program developed by NIST which can take a micrograph to create a finite element model with a specific microstructure.
• OOF2 itself can solve for the local behavior of a material and a range of physical phenomena. The microstructure model generated in OOF2 can also be imported in Abaqus for analysis.
• Comparing to “drawing” a simplified microstructure in Abaqus, combining OOF2 and Abaqus is a better approach to microstructure FEA.

• General procedure
• Set pixel groups based on image pixels in OOF2.
• Assign material properties to the pixel groups, including mechanical properties (Young’s Modulus, Poisson’s Ratio) and CTE in OOF2.
• Meshing the image in OOF2.
• Import the model with stable mesh generated by OOF2 for Abaqus simulation.
• Simulate in Abaqus.
• We ran FEA in both OOF2 and Abaqus and compared the results to validate the approach.

• Plain stress model
• $\Delta&space;T=-375_{_}^{o}\textrm{C}$

 Material E (GPa) $\nu$ CTE (ppm/$_{_}^{o}\textrm{C}$) Cu 110 0.35 16 Si 130 0.28 2.8