Title: EXPERIMENTAL MEASUREMENT AND ANALYSIS OF INSERT DEBONDING IN CARBON FIBER STRUCTURES FOR PARTICLE DETECTORS
Authors: Martin Janda, Giorgio Vallone, Eric Anderssen, Dennis Boettcher, Thomas Johnson, Claudia Bird, Todd Claybaugh, Marcos McGee Toledo
Abstract: The Inner Tracker detector (ITk), part of the ATLAS High-Luminosity LHC Upgrade, consists of pixel and strips sensors, held in place by rigid structures designed to ensure very high stiffness and radiation length. The main structure, designed at LBNL, consists of a 3 mm thick, 6 m long and 2 m wide carbon fiber cylinder. The critical connections of this cylinder to the external cryostat and the inner structures were tested against nominal and ultimate loads, monitoring the deformations with strain gauges and LVDTs. The failure load was then measured: the local debonding of a large titanium insert caused the structure to collapse. Here we present the main experimental results, comparing them with numerical and analytical models that allowed us to predict the failure load with good accuracy
References:  Tong, Liyong and Soutis, Costas. Recent Advances in Structural Joints and Repairs for Composite Materials. Springer Dordrecht, 2003. DOI: 10.1007/978-94-017-0329-1.  Henkel Corporation, Hysol® EA 9396 Epoxy Paste Adhesive Properties  ATLAS Collaboration. Technical Design Report for the ATLAS Inner Tracker Pixel Detector. Geneva, 2017. DOI: 1 0.17181/CERN.FOZZ.ZP3Q. URL: http://cds.cern.ch/record/2285585.  ATLAS Collaboration. Technical Design Report for the ATLAS Inner Tracker Strip Detector. Geneva, 2017. URL: http://cds.cern.ch/record/2257755.  Vallone, Giorgio et al., “Outer Cylinder, Design Report for PRR”. CERN EDMS No. 2048058, Technical Report AT2-IG-ER-0001, >https://edms.cern.ch/document/2391486/5<  Barenblatt, Grigory Isaakovich. “The Mathematical Theory of Equilibrium Cracks in Brittle Fracture”. 1962. Advances in Applied Mechanics, Volume 7, pp .5-129.  Dugdale, Donald Stephen. “Yielding of Steel Sheets Containing Slits”. 1960. Journal of the Mechanics and Physics of Solids, Volume 8, pp. 100-104.  Park, Kyoungsoo and Paulino, Glaucio H. “Cohesive Zone Models: A Critical Review of Traction-Separation Relationships Across Fracture Surfaces”. November 2011. Applied Mechanics Reviews, Volume 64.
Conference: SAMPE 2023
Publication Date: 2023/04/17
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