1. Strip Petals: Local supports and prototype tests?
IFIC-Valencia
C. Lacasta, C. García, J.V Civera, B. Muñoz, U. Soldevila, P.Bernabeu, R. Marco
Strip Petals: Local supports and prototype tests
IFIC-Valencia

2. EC Envelope Substructure #1
Inner
Cylinder
Support Beam
Disks supports
Support Frames

3. EC Envelope Substructure #2
Services Rings
Services Channels

4. Worst place to insert a petal
0.65m 1m
1.4m
0.288m

5. Worst place to insert a petal
0.288m

6. Assembly sequence starts!

7. Disk inserts for petal supports very preliminary concept
Assembly sequence #1
Tooling
Disk inserts for petal supports
very preliminary concept

8. Assembly sequence #2

9. Assembly sequence #3

10. Assembly sequence #4
The tooling could keep this angle constrained
very preliminary concept
When manual insertion is complicated, the tooling guides the insertion

11. Assembly sequence #5

12. Assembly sequence #6

13. Assembly sequence #7

14. Assembly sequence #8

15. Assembly sequence #9

16. Assembly sequence #10

17. Tooling removed no additional mass added
Assembly sequence #11
Tooling removed no additional mass added

18. Accessible area for Local Supports
4 inserts as a very preliminary design
Not accessible: should allow to slide petal in
LS4
LS3
LS2
600mm
LS1
200mm

19. Very simple model to determine LS
34.7 Hz
Density: 1604Kg/m3
Efacings: 146GPa
Ecore: 25MPa
64.4 Hz
Density: 1604Kg/m3
Efacings: 146GPa
Ecore: 25MPa
92 Hz
92.9 Hz
Density: 1604Kg/m3
Efacings: 146GPa
Ecore: 25MPa
65.7 Hz7
Density x2: 3207Kg/m3
Efacings: 146GPa
Ecore: 25MPa

20. Current configuration for LS Constraints
Final constraints
3.- Screw
Ux, Uy, Uz constr.
(Close to cooling connections)
2.- C-channel
Ux constr.
(disk insert) x y
43.45 Hz
Density: 1.604g/cc
Efacings: 146GPa
Ecore: 25MPa
1.- C-channel
Uy, Ux constr. (disk insert)

21. Petal Local supports
C-channel
Bolted
C-channel

22. Petal Local supports
The structure allows old supports to behave as new concept requires

23. Thermal Stress; Setup
dry air cooled down by copper coil submerged in liquid nitrogen
Capacitive non contact displacement sensors
Reduced area
Coolant from chiller

24. Thermal Stress; First results
Only convection
Next steps:
- CO2 cooling.
- Improve the set-up to cool the air down as much as possible.
- Repeat with different configuration for the sensors (over the pipes/opposite side of petal).
T_air = 12ºC
Convection + cooling pipes (chiller)

25. Thermal test (H2O-DryAir); results
more data available for FEA (H2O and dry air used)
well-known properties

26. Summary: prototypes mechanical tests
Carbon Facings K13D2U 0x/90x/0x 0.21mm
No Grinded Hcomb sandwich core
9396; Honeycomb to Carbon Facing
SS - CO2 cooling pipe OD: 2.8mm ID: 2.2mm
CGL; SS Pipe to POCOFoam
CGL; POCOFoam to Carbon Facing
Top-bottom Aluminum closeouts
CF tubes on sides
Prototype 2:
Carbon Facings K13D2U 0/90/0 0.21mm
Grinded Hcomb sandwich core
9396; Honeycomb to Carbon Facing
SS - CO2 cooling pipe OD: 2.8mm ID: 2.2mm
CGL; SS Pipe to POCOFoam
9396 BN; POCOFoam to Carbon Facing
Gaps minimized by extending Hcomb & POCOFoam
No CF tubes on sides
MODAL ANALYSIS TEST
METROLOGY MEASUREMENTS
THERMAL STRESS TEST
BENDING TEST
METROLOGY MEASUREMENTS

27. Work in Progress FEA: EC Substructure#1