1. Clic Vertex Thermal Setup and stave studies
23/09/2013
Francois-Xavier NUIRY
Andrea Catinaccio
CERN PH/DT/EO

2. Overview Thermo-mechanical setup progress.
Stave prototype: measure of the bending stiffness.

3. Set up status 1st version:
2nd version: Improvements to get the upper face stiffer.
picture

4. vibration sensors (Capacitive sensors)
Set up read out status
The DAQ system will be made of:
Sensors:
Active systems:
-Fan (0-10V input)
-Heaters (2 times 50mW/cm2)
DAQ system:
1 NI Compact DAQ 9188 (8 slots)
1 NI 9208, 24-bit current input module
2 NI 9219, Universal module, 4 channels, 24 bit, +/-24V
Software :
Acquisition with labview.
Stave sensors
Sensors
Number
Range of use
Accuracy
Anemometers
Schmidt SS20.400 4
0 / +20m/s
+/-1%
Temperature sensors
PT100 or NTCs 10
0 / + 50°C
+/-0.1°C
vibration sensors (Capacitive sensors) ~1
TBD

5. Stave support status
 1st prototypes printed in 3D (ABS Plus) - Low quality - Can be used as preliminary tests Next prototypes could be printed with the new 3D printer of the polymer lab?
-Platform size: 250x250x250 mm;
- X and Y plane limited by laser beam diameter (~0.075 –0.300 mm);
- Z axis limited by layer thickness
- Fast 0.15 mm (25)
- Exact 0.1 mm (25,48HTR,BS)
- HR 0.05 mm (25,48HTR)
(Due to overcuring it should be minimum 3x the layer
thickness)
picture

6. Stave Measure and calculation of the bending stiffness
Weight for 280mm  3.5g g g g g
2*0° M55J
(0.140mm each)
Rohacell as core
1.82mm thick
2*0° M55J
(0.140mm each)
Rohacell as core
~1.84mm thick
2*0° M55J (3 and 4mm width)
(0.140mm each)
Rohacell as core
~1.84mm thick

7. Stave Measure and calculation of the bending stiffness
Test performed: 3 points bending test
Standard used: ASTM D790-02
Configuration:
Loading nose and supports radius: 5mm
Support span : 57.6, 108, 140, 160, and 180mm
Loading nose speed: 3.07, 10.8, 18.15, 23.7, 30mm/min
Test stopped when 2.5N are reached

8. Stave Measure and calculation of the bending stiffness
FEM simulations: (Total thickness = 1.8mm)
Cantilever model
Stave 4
Stave 6
Stave 7
Stave 8
Stave 9
FEM
Bending stiffness [*10^5 N.mm^2]
15.8
5.64
5.98
3.74
4.97
Torsional stiffness [*10^4 N.mm^2]
5.83
7.45
7.73
5.05
Measures
3 Points tests
Support span =180mm
8.44
4.05
3.6
2.71
2.37
The bending stiffness measured is lower than the calculated one.
A 3 points bending test simulation was done

9. Stave Measure and calculation of the bending stiffness
FEM simulations: (Total thickness = 1.8mm)
3 points bending test
Stave 4
FEM
Support Span [mm]
110
140
160
180
Flexural stiffness [N/mm]
26.15
16.15
12.1
9.15
Bending stiffness [*10^5 N.mm^2]
7.25
9.23
10.3
11.1
Measures
3 Points tests 20
11.4
8.7
6.95
5.55
6.52
7.42
8.44
The bending stiffness measured is lower than the calculated one.
A transversal deformation may be more important than expected in a 3 points bending tests?
Problems at the CF / foam joint?

10. Stave Measure and calculation of the flexural stiffness
FEM simulations: (Total thickness = 1.8mm)
3 points bending test

11. Stave Measure and calculation of the bending stiffness
FEM simulations: (Total thickness = 1.8mm)
3 points bending test
E*I=F*L^3/(48*f)

12. Stave comments from the ASTM D790-02
Observation from the flexural test:
The bending stiffness is decreasing with the support spacing.
ASTM.- D 790 paragraph 7.5:
Highly orthotropic laminate
The span to depth ratio should be chosen such that failure failure occurs in the outer fibers of the specimens and is due only to the bending moment. A span to depth ratio larger than 16:1 may be necessary. For some highly anisotropic composites, shear deformation can significantly influence modulus measurements, even at a span to depth ratio as high as 40:1. Hence, for this material, an increase of the span to depth ratio to 60:1 is recommended to eliminate shear effects when modulus data are required, it should also be noted that the flexural modulus of highly anisotropic laminates is a strong function of ply stacking sequence [...].
From ASTM D790 Note 16:
Shear deflexions can seriously reduce the apparent modulus of highly anisotropic composites when they are tested at low span to depth ratios. For this reason a span to depth ratio of 60 to 1 is recommended for flexural modulus determination on these composites. [...]. Since the flexural modulus of highly anisotropic laminates is a critical function of ply stacking sequence, it will not necessarily correlate with tensile modulus, which is not stacking-sequence dependent.

13. Summary Set up: Next steps:
Installing the system in a new laboratory (Waiting for Wolfgang and Mar)
Installing the read out system (hardware + software) to start first measurements
Staves: Next steps:
Going on calculation / measurement comparisons:
-Stave torsional measurements?
Elaboration of a first design in view of the manufacturing of new prototypes (CERN and outside?)
Printing of new stave supports

14. ABS plus material (3D printer PH/DT)