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ARMOR PLATE2/18/10

NEUTRAL BEAM ARMOR

PRELIMINARY ANALYSIS

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ARMOR PLATE2/18/10

OBJECTIVES

• Develop the Finite Element Model for The Armor Eddy Current Analysis– Show Mesh Density and Boundary Conditions

• Apply Disruption Case of Magnetic Vector Potential from Opera Data Tables– Data tables (provided by others) are contoured as inputs to this analysis.– Magnetic Flux B Field is contoured on the FE model – The Magnetic Vector Potential is contoured on the FE model as an input to this analysis.

• Provide Magnetic Results for:– Current Density at five discrete locations as a function of time.

• Trend identifies the critical time step during the disruption event

– Current Density as a Vector Plot.• This result shows directional trends of current during the disruption

• Develop the Finite Element Model for Transient Structural Results – Show the mesh and Structural Boundary Conditions

• Provide Transient Structural results for:– Max Displacement at highest current and final load step– Contour results for von Mises stress– Preliminary Reaction Load Magnitudes

• Provide Conclusions and Planned Recommendations

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ASSUMPTIONS

• Magnetic Vector Potential Data Tables:– 2-D Opera Results uniformly expanded into 3-D as provided by Ron Hatcher

through Srinivas Avasarala e-mail dated 2-9-10.– Opera Data encompasses Max disruption load case

• All Components are Merged Integral Solids from Pro-Engineer– No gaps or other nonlinear material properties

• Note: This will effect how load distributes through the structure.

– Welded Reaction Points are Rigid fixed in all DOF• Note: This artificially adds strength to the structure that does not in reality exist.

– All Support Structure Braces are Merged Solids• Note: Reaction Loads and moments are only approximate – not for final design

– Transient Dynamic Analysis assumes 0.5% structural damping

• Single Uniform Material Property : 625 Inconel

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MAGNETIC VECTOR POTENTIALELEMENT MESH

THE ELEMENT MESH DENSITYTHE ELEMENT MESH DENSITY

Element Type 186

20 node brick

Limited Type 187

10 node tetrahedral

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Opera ProgramMagnetic Vector Potential Sum

THE SPECIFIED INPUT ASSUMPTIONS FOR VECTOR POTENTIAL AT MAX TIME STEP

THE SPECIFIED INPUT ASSUMPTIONS FOR VECTOR POTENTIAL AT MAX TIME STEP

222 )()()( zyx AAAASUM

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Voltage Contour

VOLTAGE DISTRIBUTION AT MAX TIME STEPVOLTAGE DISTRIBUTION AT MAX TIME STEP

All welds set to zero voltage

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CURRENT DENSITY Four Discrete Locations Vs TIME

THE MAX CURRENT DENSITY OCCURS AT TIME = 10.006 SecTHE MAX CURRENT DENSITY OCCURS AT TIME = 10.006 Sec

4,788 E4 Amps/ M**2

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CURRENT DENSITY VECTORSAt Max TIME Step

CURRENT DENSITY VECTOR AT MAX TIME STEPCURRENT DENSITY VECTOR AT MAX TIME STEP

Currents move to ground voltage as specified in boundary conditions.

Higher concentrated values at sharp corners adjacent to welds.

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Opera ProgramFlux Field at Max Time Step

THE SPECIFIED INPUT ASSUMPTIONS FOR FLUX FIELD AT MAX TIME STEP

THE SPECIFIED INPUT ASSUMPTIONS FOR FLUX FIELD AT MAX TIME STEP

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Opera ProgramFlux Field at Time = 0.007 Sec

THE SPECIFIED INPUT ASSUMPTIONS FOR FLUX FIELD AT TIME STEP = 0.007

THE SPECIFIED INPUT ASSUMPTIONS FOR FLUX FIELD AT TIME STEP = 0.007

220006.0007.0

)28.15.1(

t

B

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STRUCTURAL MODEL

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Structural Transient Boundary Conditions

The Structural Boundary Conditions Are DefinedThe Structural Boundary Conditions Are Defined

All welds are rigidly constrained

Symmetric Boundary

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Transient Max Displacement

Max Transient Displacement Trends During Disruption Occurs at 0.007 Seconds after Initiation

Max Transient Displacement Trends During Disruption Occurs at 0.007 Seconds after Initiation

Time = 0.007 Sec

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ARMOR PLATE2/18/10

Structural Transient Boundary Conditions

The Displacement Results at Max Current Time Step is definedThe Displacement Results at Max Current Time Step is defined

Note: The assumed rigid structural deflections will be larger on actual model

Units are Meters.

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Transient Max Displacement

Typical Transient Stress Trends During DisruptionTypical Transient Stress Trends During Disruption

Time = 0.007 Sec

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Von Mises Stress at Max Current

The Transient Equivalent Stress at Max Current is LowBased on the assumptions of zero voltage at the Welds

The Transient Equivalent Stress at Max Current is LowBased on the assumptions of zero voltage at the Welds

Max Stress = 1.6e7 Pa = 2,320 psi

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Von Mises Stress at Max Current

The Transient Equivalent Stress at Max Current is LowBased on the assumptions of zero voltage at the Welds

The Transient Equivalent Stress at Max Current is LowBased on the assumptions of zero voltage at the Welds

Max Stress = 1.6e7 Pa = 2,320 psi

Max Bounded Stress = 6.2e7 Pa = 9,065 psi

FX = -5820.6 N FY = 5653.7 N FZ = 8554.8 N MX = -778.5 NM MY = -759.4 NM MZ = 28.54 NM

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CONCLUSIONS

• The Preliminary Armor Electromagnetic and a Transient Dynamic Structural analysis is complete based on the best OPERA information available as of today.

• The Electromagnetic Analysis based on the disruption data from Ron Hatcher

is complete, however, this data may not represent the actual max values.

A revision for this region is pending completion before March 1, 2010.• The max current density (4,788 E4 Amps /M^2) occurs 0.006 seconds into the

disruption event• The max stress (9,065 psi) and X displacement (2.96 Mils) occurs at 0.007 seconds

into the disruption event.• The max reaction load occurs at 0.006 seconds near the center port welds is a total

of 11,790 N (2,651 lbs).• The stresses from these loads are minimal and well within the material capacity of

625 Inconel.• Inclusion of the Reactor Vessel is required to fully capture the current share in these

structures since the assumption of ground voltage at the weld locations may not be adequate.

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RECOMMENDATIONS

• Initiate addition of new solid models from design to include the NSTX reactor vessels.

• Continue to refine analysis technique to facilitate the analysis of these models.

• Rerun all of the analysis when the refined Opera data becomes available for the max disruption event adjacent to the Armor Structure.

• Expand the structure runs to include sub models on the weld attachment points and bolts.

• Evaluate reductions in the stiffness on this structure by extracting the supports from the assumed rigid boundary.

• Initiate the Transient thermal analysis models for the Armor Tiles