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Flex attachment to the stave Glue selection: preliminary tests. 30/08/2011 Maxence CURDY François-Xavier Nuiry. CERN PH/DT/PO. Flex to stave assembly. Genova flex. Goal : Realise a reliable and accurate fixation between the flex and the omega carbon skin Accuracy / omega:.

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flex attachment to the stave glue selection preliminary tests

Flex attachment to the staveGlue selection: preliminary tests

30/08/2011

Maxence CURDY

François-Xavier Nuiry

CERN PH/DT/PO

flex to stave assembly
Flex to stave assembly

Genova flex

Goal: Realise a reliable and accurate fixation between the flex and the omega carbon skin

Accuracy / omega:

Better than +/-0.3mm

About

+/-0.1mm

Technology used: Glued joint

Stress in the glue: Currently tested (through several shear tests) and also under calculus

The total force considered :

Flex

Glued over ~350mm

Max stress

Max stress

F

F

2F=(ES)/L * (thermal contraction)= (11500*0.6*11.5)/350 * 0.55 = 125N

F~62.5N, If the flex young modulus is 11.5GPa

flex to stave assembly1
Flex to stave assembly

Genova& Bonn flex

65 test samples manufactured

Cleaning at surface treatment workshop

Surface activation with Plasma

Shear tests

Glue selection

plasma set up polymer lab at cern
Plasma set upPolymer lab at CERN

Displacement in X with the handle

preliminary information on kapton surface activation
Preliminary information on Kapton surface activation
  • Speed and Distance between the BLASTER nozzle to substrate surface (Kapton) have to be determined in order to stay under 120⁰C. ( given by Rui)
  • But tests show that we need to heat a bit to activate the surface.
  • So we must find a compromise between speed, height and number of run.
wettability control on kapton sample lf 7001 13 m
Wettability control on Kapton sample LF 7001 (13μm)

The effect of plasma treatment can be controlled by a wetting test.

But this is just a visual check, it’s not precise.

Not activated

surface

Activated

surface

When the nozzle is adjusted at 8 mm and no displacement

 T⁰C max about 160⁰C

treatment control
Treatment control

The treatment can also be controlled with test ink.

When the surface tension is high  the surface became wettable and it’s easier to glue it.

42mN/m

We control the surface tension to 70mN/m.

The control of the surface tension shows that from 4 run, the number of run doesn’t influence activation.

Kapton

70mN/m

Kapton after 4 run, 8mm and 8cm/s

70mN/m

Kapton after 6 run, 8mm and 8cm/s

procedure for glued samples
Procedure for glued samples
  • Glue preparation
  • Series of 5 Kapton specimens are activated (4 runs) directly between two foils of 0.6mm (no time lost for gluing).
  • Put glue on the Kapton (4*4mm) and calibrate glue with foils (10μm of glue).
  • Position carbon fibre specimens on a levelling pad.
  • Glue the Kapton on carbon fibre specimens.

2

3

Glue

Activation

4

5

Kapton + Carbon Fibre specimen

slide11

Glued samples

Thermal cycling

100 cycles

Temp ˚C

+50

-40

Time, min

50 minutes