flex attachment to the stave glue selection: preliminary tests

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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:. - PowerPoint PPT Presentation

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Plasma Blaster Installation

Flex attachment to the staveGlue selection: preliminary tests30/08/2011Maxence CURDYFranois-Xavier Nuiry

CERN PH/DT/PO1Flex to stave assembly

Genova flex

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

Accuracy / omega:

Better than +/-0.3mmAbout+/-0.1mmTechnology used: Glued joint

Stress in the glue: Currently tested (through several shear tests) and also under calculusThe total force considered :FlexGlued over ~350mm2F=(ES)/L * (thermal contraction)= (11500*0.6*11.5)/350 * 0.55 = 125NF~62.5N, If the flex young modulus is 11.5GPaFFMax stressMax stress2Flex to stave assembly

Genova & Bonn flex3GlueCommentsAraldite 2011Used everywhere in ATLASCurrently testedScotchweld 2216Soft, easy to apply, thin layers (~10 microns)Currently testedDP460easy to apply, no data about radiationsCurrently testedDP490Quite good adherence on the Kapton, no data about radiationsTest stoppedEccobond 286Hard to apply, thicker layers, bad adherenceTest stoppedStaycast 2850 + cat 9hard comportment thicker layers (50 microns)Currently testedCAF 4 [Silicone]Bad adherence on the KaptonTest stopped65 test samples manufacturedCleaning at surface treatment workshopSurface activation with PlasmaShear tests Glue selection

4

Plasma set upPolymer lab at CERN5

Displacement in X with the handlePreliminary information on Kapton surface activation6

Speed and Distance between the BLASTER nozzle to substrate surface (Kapton) have to be determined in order to stay under 120C. ( 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.

7Plasma Tests Performed on KaptonCleaning with ACETONE -->ETHANOL

Kapton sheettest to be realizedhauteur tete mmvitesseEcoulementForme goutteTCObservations supplementaires1Kapton seul Nettoyer a acetone , & Deposer eau distille sur kapton. Observer l'ecoulement de l'eau__LentRondeTension superficielle (Encres Test): 42mN/m2Kapton seul Nettoyer a acetone , appliquer plasma puis appliquer eau distille pour verifier mouillabilit202 cm/sRonde??1 Passage Pas d'activation3Kapton seul Nettoyer a acetone , appliquer plasma puis appliquer eau distille pour verifier mouillabilit200.4 cm/sRonde??1 Passage Pas d'activation4Kapton seul Nettoyer a acetone , appliquer plasma puis appliquer eau distille pour verifier mouillabilit150.4 cm/sOvale ??1 Passage5Kapton seul Nettoyer a acetone , appliquer plasma puis appliquer eau distille pour verifier mouillabilit100.4 cm/sOvale -Plate ??1 Passage6Kapton seul Nettoyer a acetone , appliquer plasma puis appliquer eau distille pour verifier mouillabilit124 cm/sRonde