University of Washington, Seattle

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Presentation transcript:

University of Washington, Seattle Experience with design and construction of CF structures for Silicon trackers Worked on design and fabrication of a number of CF structures for the new Layer 0 of D0 Silicon Micro Tracker Design and building of 3-d model of the structure Fabrication of precision mandrels Fabrication of the support structures and cooling manifolds Worked on design of proposed Run2b D0 Silicon Tracker and had major responsibility for design and fabrication CF support structure for Layers 1 and 2 Participants: Henry Lubatti (Physics), Colin Daly, Bill Kuykendall and Mark Tuttle (Mechanical Engineering) Mark Tuttle has many years experience with CF work and a fully equipped CF lab with ovens and hot presses Colin Daly has extensive experience with CAD design and FEA analysis Performed all FEA mechanical and thermal studies for the Run2b structures and the recently installed Layer0 Bill Kuykendall did all of the material layup for the SMT support structures including developing a method for co bonding a Kapton-cooper mesh ground plane to the carbon fiber support structure May 22, 2007 Vertex Detector Mechanics Meeting Henry Lubatti

University of Washington, Seattle Resources Large Physics Department Machine shop with 6 full time instrument makers Experience in fabricating precision mandrels for D0 Silicon Micro Tracker (SMT) CF support structures Experience with machining composites Equipment for evaluating finished pieces (CMM) Extensive experience in fabricating CF structures for the D0 SMT (Run2b and L0) Access to resources in the departments of Mechanical Engineering Use of equipment for measuring mechanical properties Universal Tensile testing machine Strain gauge conditioning and recording equipment Environmental test chambers Mark Tuttle’s lab in Mechanical engineering Fully equipped lab for layup and production of CF structures Access to Department of Material Science autoclave (60 cm diameter and 60 cm deep) May 22, 2007 Vertex Detector Mechanics Meeting Henry Lubatti

Vertex Detector Mechanics Meeting Henry Lubatti CAD Capability Unigraphics NX5 CAD/CAM Package. Very powerful 3-d modeling capability Complex assemblies easily created along with interference checking, exploded views, etc. Simple generation of engineering drawings Fully integrated to CAM operations so that machine shop can generate tool paths for CNC machining directly from the solid model Changes to solid model automatically update the tool paths May 22, 2007 Vertex Detector Mechanics Meeting Henry Lubatti

Vertex Detector Mechanics Meeting Henry Lubatti CAD Capability Example of work done for L0 May 22, 2007 Vertex Detector Mechanics Meeting Henry Lubatti

Finite Element Analysis Ansys version 11 FEA system research license No size limit on problem Carbon fiber/epoxy structures modeled with solid elements using orthotropic material properties Extensive experience with CF structures used in upgrades to layer 0 of the D0 detector at FNAL Used for design of all of the 436 end cap muon chambers for ATLAS at LHC May 22, 2007 Vertex Detector Mechanics Meeting Henry Lubatti

Finite element Analysis Example of work done for L0 FEA model of a proposed Layer 0 CF structure Gravitational deflection of the structure May 22, 2007 Vertex Detector Mechanics Meeting Henry Lubatti

Physics Department Machine Shop Fully equipped Physics Department machine shop Four CNC mills One with one has 82 inch x-travel (about 2 meters) Two CNC lathes Many conventional mills and lathes Wire EDM Die sinker Quality control equipment in temperature controlled room Brown and Sharp coordinate measuring machine Smart scope for small pieces Full welding capabilities (TIG/MIG) May 22, 2007 Vertex Detector Mechanics Meeting Henry Lubatti

Mechanical Engineering Composites Fabrication Hot press, 50 ton Tetrahedron, 35cmx35 cm platens Lab Ovens (3), 250°C 20in x 20” x 15” 36” x 48” x 30” 12” x 72” x 12” (MSE) 12” x 72” x 12” (MSE) Material Testing Lab Instron load frames 5585H 250kN capacity, static testing, tension/compression. 8511 20kN capacity, static or cyclic testing, tension/compression Abrasive water jet cutter, 2-axis CNC, 48” x 48” table Universal testing machine for evaluating tensile properties Rapid prototyping facilities May 22, 2007 Vertex Detector Mechanics Meeting Henry Lubatti

University of Washington - ILC detector The Seattle group has been working with Fermilab on the carbon-fiber mechanical support structures Develop techniques for fabricating and handling thin-walled carbon fiber structures Prototypes of carbon-fiber support structures Various tooling for attaching support membranes to support structure and mounting silicon wafers on support structure FEA analysis of mechanical and thermal behavior Measurement of material properties of carbon-fiber lay-ups Fabricated and delivered to Fermilab Three prototype half-shell structures for evaluation, testing and developing silicon mounting procedures Assembly mandrel, end ring glue fixture and vacuum chuck for precision placement of silicon May 22, 2007 Vertex Detector Mechanics Meeting Henry Lubatti

Support Structure Proof of Concept A simple mandrel was made to develop fabrication techniques for the proposed carbon fiber structure Material is pre-laminated on a flat surface. Then the windows are cut out leaving the frame. The pre-laminate is then layed up on the mandrel, loaded into a vacuum bag, and cured in an autoclave. Removing the cured part from the mandrel without breaking it is a delicate procedure, but we demonstrated that this could be done reliably. May 22, 2007 Vertex Detector Mechanics Meeting Henry Lubatti

Layer 1 Prototype Support Structures Fabrication techniques and mandrel design were refined for production of the prototypes Windows are hand cut from the flat, uncured material using an aluminum template. After curing, the window edges are cleaned up with fine sandpaper. The ends are left long to maintain structural integrity during removal from the mandrel and while sanding the window edges. A belt sander is used for the final operation of cutting the ends to length. After Sanding Before Sanding May 22, 2007 Vertex Detector Mechanics Meeting Henry Lubatti

Layer 1 Prototype Support Structures Three structures made from K13C2U material Fiber orientation is [0,90,90,0] Next will do [0,90,0] Parts are delicate but reasonably robust if handled properly. Each structure is shipped with a handling mandrel (polyurethane castings of the lay-up mandrel). End-rings have been installed at Fermilab on one structure. May 22, 2007 Vertex Detector Mechanics Meeting Henry Lubatti

Vertex Detector Mechanics Meeting Henry Lubatti Tooling Two identical steel mandrels were CNC machined. One mandrel is used in Seattle for carbon fiber lay-up. The second mandrel is used at Fermilab as an assembly fixture, and for mounting silicon. A vacuum chuck with a porous ceramic surface was fabricated. The chuck will be used to place silicon. Fixtures (2) for positioning of the end-rings during glue-up to support structure were machined. Fixtures are also used as support structure thickness gauges. May 22, 2007 Vertex Detector Mechanics Meeting Henry Lubatti

Vertex Detector Mechanics Meeting Henry Lubatti FEA Studies This work has the aim of understanding how to optimize the geometry of the carbon fiber/epoxy composite frame to minimize deflection due to gravity and temperature changes. This model uses a 4-layer (0,90,90,0 degree) lay-up. The gravitational deflections of two slightly different structures are: (a) (b) Open slots to reduce material One slot closed to reduce thermal deflection The maximum deflection vector is about 0.6 mm in each case. May 22, 2007 Vertex Detector Mechanics Meeting Henry Lubatti

Measurements of Carbon Fiber Properties Coefficient of Thermal Expansion measurements of [0,90,90,0] specimens underway. Test method: Measurement Group Tech Note TN-513-1. CTE measured using strain gages mounted front and back on flat coupons. Coupons mounted in rack and placed in lab oven. Thermocouples taped to each CF coupon. Strain and temperature will be monitored Dwell time at each increment will be 15 minutes minimum. May 22, 2007 Vertex Detector Mechanics Meeting Henry Lubatti