Présentation au sujet: "Flex attachment to the stave Glue selection: preliminary tests"— Transcription de la présentation:
1 Flex attachment to the stave Glue selection: preliminary tests 30/08/2011Maxence CURDYFrançois-Xavier NuiryCERN PH/DT/PO
2 Flex to stave assembly Genova flex Goal: Realise a reliable and accurate fixation between the flex and the omega carbon skinAccuracy / omega:Better than +/-0.3mmAbout+/-0.1mmTechnology used: Glued jointStress in the glue: Currently tested (through several shear tests) and also under calculusThe total force considered :FlexGlued over ~350mmMax stressMax stressFF2F=(ES)/L * (thermal contraction)= (11500*0.6*11.5)/350 * 0.55 = 125NF~62.5N, If the flex young modulus is 11.5GPa
3 65 test samples manufactured Flex to stave assemblyGenova & Bonn flexGlueCommentsAraldite 2011Used everywhere in ATLASCurrently testedScotchweld 2216Soft, easy to apply, thin layers (~10 microns)DP460easy to apply, no data about radiationsDP490Quite good adherence on the Kapton, no data about radiationsTest stoppedEccobond 286Hard to apply, thicker layers, bad adherenceStaycast cat 9hard comportment thicker layers (50 microns)CAF 4 [Silicone]Bad adherence on the Kapton65 test samples manufacturedCleaning at surface treatment workshopSurface activation with PlasmaShear testsGlue selection
5 Plasma set up Polymer lab at CERN Displacement in X with the handle
6 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.
7 Plasma Tests Performed on Kapton Cleaning with ACETONE -->ETHANOL Kapton sheettest to be realizedhauteur tete mmvitesseEcoulementForme goutteT⁰CObservations supplementaires1Kapton seulNettoyer a acetone , & Deposer eau distillée sur kapton. Observer l'ecoulement de l'eau_LentRondeTension superficielle (Encres Test): ≤ 42mN/m2Nettoyer a acetone , appliquer plasma puis appliquer eau distillée pour verifier mouillabilité202 cm/s??1 Passage → Pas d'activation30.4 cm/s415Ovale1 Passage510Ovale -Plate6124 cm/s<132⁰C7>132⁰C2 Passages8Kapton avec protection9<120⁰C8 cm/s11132 Passages → Protection fond14Plate2 Passages → Protection fond16174 Passages184 Passages [10s]19<116⁰C4 Passages [5s]4 Passages Tension superficielle (Encres Test): > 70mN/m216 Passages Tension superficielle (Encres Test): > 70mN/m
8 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 activatedsurfaceActivatedsurfaceWhen the nozzle is adjusted at 8 mm and no displacement T⁰C max about 160⁰C
9 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/mWe 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.Kapton70mN/mKapton after 4 run, 8mm and 8cm/s70mN/mKapton after 6 run, 8mm and 8cm/s
10 Procedure for glued samples Glue preparationSeries 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.23GlueActivation45Kapton + Carbon Fibre specimen
11 Glued samples Thermal cycling 100 cycles Temp ˚C +50 -40 Time, min 50 minutes
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