Ronan McGovern amp Diego Perini 7302009 1 Ronan McGovern amp Diego Perini Summary Layer amp Bolting Analysis Detector Section 2D analysis 3D detector analysis 7302009 2 Ronan McGovern amp Diego Perini ID: 915944
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Slide1
Detector and Component Stress & Deformation Analysis
Ronan McGovern & Diego Perini
7/30/2009
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Ronan McGovern & Diego Perini
Slide2Summary
Layer & Bolting Analysis
Detector Section 2D analysis3D detector analysis
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Slide3Layer Analysis – Layer Options
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Slide4Layer Analysis – Layer Options
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Slide5Layer Analysis – Layer Options
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Layer subjected to it’s own weight
Slide6Layer Analysis – Layer
Options
Advantages of SS-W layer over W layer
Reduced costs
Allow a reduction of concentrated forces applied to W.
Sandwich versus Dual layer
Sandwich protects Tungsten from washer forces
Thickness of SS in sandwich is thin - difficult to bolt
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Slide7Layer Analysis – Bolting Analysis
Normal Weight – 1 Plate
Force - 1275.652 N/mMax Mises – 19
MPa
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Normal
Weight – 4 plates
Force -
5102.606 N/m
Max
Mises
– 78
MPa
Slide8Layer Analysis – Bolting Analysis
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Shear Weight – 4 plates
Force -
5102.606
N/m – distributed over 4 bolts
Max
Mises
– 256
MPa
Slide9Layer Analysis – Bolting Analysis
ConclusionsFrom initial calculations bolting remains
feasibleHowever, difficulties lie within calculation of
Bolt thread stressNote: Threads were previously used in INERMET in other detectors
Forces exerted upon plates by SS lattice and
washers
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Slide10Detector Section 2D analysis
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Slide11Detector Section 2D analysis
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Simulation does not take into account the rigidity of the layers.
Slide12Section 2D analysis – Layer
Density
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Slide13Detector Section 2D analysis
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Slide14Detector Section 2D analysis
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Slide15Detector Section 2D analysis
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Slide16Detector Section 2D analysis
ConclusionsInitial wall thickness approximation = 20 mm
Stresses in horizontal sections need to be estimated allowing for the rigidity of internal layers
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Slide173D detector analysis
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Slide183D detector analysis – Overall Model
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We seek to calculate the maximum deflection
Layers (Dual Layer Composition)
Iron
Simulation does not take into account the rigidity of the layers.
Imposed zero displacement condition
Slide193D detector analysis – Detector Lattice
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We seek to calculate the maximum deflection and stress
Simulation does not take into account the rigidity of the layers.
Zero displacement imposed on SS lattice face.
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Overall model
Max
Total Deformation
= 2.05 mm
Detector Lattice
Max
Total Deformation
= 1.31 mm
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Max Stress = 42
MPa
Slide223D detector analysis – Detector Lattice
Conclusions
Welding or bolting the detector lattice to such a mass is very advantageous in reducing deformation and stress compared to supporting the detector at radial points.“Closed section” greatly reduces stress and deformation.
Weight of each section is mainly supported by the iron mass rather than other sections.The feasibility of having an iron mass at either end of the detector should be carefully considered.
Stresses
fall within a reasonable range
Especially considering that the rigidity of the layers has been neglected
Deflection goes beyond 1 mm but in reality the rigidity of the layers should reduce this.
Boundary condition issues regarding distribution of the weight of layers on SS lattice
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Slide23Further work
Transfer of 3D detector model from Philippe Lenoir to
Ansys Workbench. (Week of 3rd Aug. 09)
Analysis of stress and deformation distributions for various support configurations of the detector lattice, including radial. (Completed by Tuesday 4
th
Aug. 09)
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