Annular Target Numerical Modeling Update

- Srisharan G. Govindarajan

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Problem Description

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Assembly with a Recess on the Inner Tube

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Numerical Modeling- 2D Model Results

Fig.6. Radial stress and temperature distribution across the annular assembly

Fig.8. Coordinate transformation verification

Fig.7. Assembly temperature contour

Fig.9. Assembly heat flux (magnitude) contour

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Circumferential Results

Tube-Tube contact

Tube-Tube contact

Fig.10. Contact pressure and temperature distribution on the inner surface of the outer tube Fig.11. Radial stress distribution on the inner

surface of the outer tube

Fig.12. Hoop stress distribution on the inner surface of the outer tube

Fig.13. Assembly hoop stress contour

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Circumferential Results

Fig.14. Contact pressure and temperature distribution on the outer surface of the inner tube

• The contact pressure remains constant throughout the region where the inner tube is in contact with the foil.

• The sharp decrease in contact pressures on either side of the tube-tube contact region can be attributed to the separation of the foil from the inner tube (will be explained in slide 8).

Tube-Tube contact

• The thermal expansion of the foil , tubes and the separation that occurs will be addressed in the next couple of slides

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Deformation of the Tubes and Thermal Expansion

Fig.15. Superimposed contours of deformed and un-deformed parts involved in the assembly. A solid black contour represents the un-deformed shape .

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Separation occurs between the partsNo Gap at this location

Gap between foil and the outer tube Gap between foil and

the outer tube

Separation transition

Separation transition

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Future work

• Perform experiments based on internal, external and interfacial heating .

• Conduct parametric studies on the numerical model developed.

• Use the experimental results to validate the Abaqus model .

• Predict the thermal contact resistance based on the Abaqus data.