3D Finite Element Analysis as long as Ribbed Structure Vacuum Vessel

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3D Finite Element Analysis as long as Ribbed Structure Vacuum Vessel

Mahkee, Wells, Managing Editor has reference to this Academic Journal, PHwiki organized this Journal 3D Finite Element Analysis as long as Ribbed Structure Vacuum VesselBy: Hamed HosseiniAdvisor: Prof. Farrokh NajmabadiIntroduction & MotivationVacuum VesselGeometry of the vacuum vessel is taken from CAD, considering the very thin vacuum vessel (5 cm) in addition to 10 cm thick at the beginningPrimary stress is per as long as med by ANSYS Workbench to see if the thinner wall can accommodate the normal pressure loads in addition to overpressure loads ( Motivation: How thin it can be based on the stress analysis). Double wall ribbed structure as a way to increase the strength of structure , reducing stress intensity in addition to cooling the system is designed in addition to analyzed.1/16 of Sectors (Symmetry )10 (m)11 (m)Material : SST 316, Yield Stress: 140 MPa, in addition to Working Temperature: 550 K 5(cm), 10(cm) Solid Single WallDouble Wall Ribbed Structure Boundary ConditionFixed BottomSymmetry (Frictionless)

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LoadsOutside Pressure (1 atm)Inside Pressure ( zero)GravitySolid Single Wall VVVery Thin VV (5-cm)Very Thin VV (5-cm) There are lots of over stressed areas > 140 MPa166 MPa197 MPa300 MPaSolid Single Wall VVThick VV (10-cm)Thick VV (10-cm) Almost all the areas are less than the yield point < 140 MPa40 MPa100 MPa123 MPa Double Wall Ribbed Structure/ S in addition to wich Panels In the solid single wall, material should be added to those areas with high stress intensity to get the stress lower than the yield point Ribbed structure as a way to add material , increases the strength of structure which helps to reduce the stress intensity with a little increase in massRibbed structure is very similar to the s in addition to wich panel techniqueS in addition to wich plate which is composed of three layers with two thin flat panel upper in addition to lower in addition to a core in between is a very efficient way of providing high bending stiffness in addition to high strength at low weight ( Libove, Hubka 1951)It provides sufficient space as long as the He coolant to follow between the ribs Ribs attached to the Inner SheetRibs attached to the outer SheetRib ConfigurationVertical Ribs or Horizontal RibsTotal Thickness of the Double Wall Ribbed StructureThickness of Each Wall (Sheets)Thickness of RibsDistance Between RibsTotal Number of RibsPort Ribbed Structure StudyVery Thin VV (5-cm)Fixed BC/5-cm Thick Port149 MPa149 MPa123 MPa123 MPa143 MPa116 MPa143 MPa116 MPaLess than 5% difference between similar pointsFixed BC Horizontal/ Vertical Ribbed Structure25cm4cm4cm4cm2cmFixed BCFrictionless BC (Symmetry)Over Stressed SpotsBoundary ConditionsOver Stressed Spots on RibsFixed BCFrictionless BC (Symmetry)400 MPaVertical Ribbed StructureVariety of vertical Ribbed Structures has been designed in addition to analyzed(different Sheet thicknesses, Rib thicknesses, gap between sheets, distance between sheets) Sheet (Wall) ThicknessInner Sheet Over StressedOuter Sheet Safe Adding 1cm to the Inner SheetRemoving 1cm from Outer Sheet74 MPaReasonable stress happens as long as inner sheet thickness above 3cmOuter sheet has less stress intensity than the Inner SheetThe high stress regions happen inside the inner sheet Outer sheet can be designed with thinner thickness than the inner sheet200 MPa3cm3cm2cm4cmRib Thickness 2cm x 4cm Rib2cm x 8cm Rib2cm4cm3cm3cm2cm8cmReasonable stress intensity happens as long as Ribs around 4cm thickness in addition to above Rib Length200 MPa194 MPaWeak Parameter, less than 5% Gap/Distance Between RibsRatio Gap/Distance: 2/13Ratio Gap/Distance: 4/20 13cm20cm2cm4cm Reasonable stress happens as long as the distance between Ribs less than 25cmBigger gap combined with larger distance between ribs gives better stress results 4cm gap combined with 20cm distance between ribs gives better stress distribution comparing the 2cm gap with 13cm distance between ribsLarger distance between ribs : Less number of ribs, more space as long as coolant, less computational time, faster convergence130 MPa110 MPa ComparisonDouble wall (Vertical Ribbed) Very Thin Solid Single wall (5-cm) 142 MPa100 MPa116 MPa90 MPa143 MPa100 MPa Ribbed structure as a way to add material , increases the strength of structure which helps to reduce the stress intensityIn the vertical ribbed structure, the stress amount gets 25-30% lower than its counterpart area on the very thin solid single wall VV (5-cm)Mixed Ribbed Structure (Transition)150 Mpa Mixed ribbed structure: Horizontal ribs on the top in addition to bottom port wings are required to lead the He coolant throughout the port to the inboard Horizontal rib at the corner: Transition rib gets over stressed spot at contact regionsNo Horizontal Rib at the Corner140Mpa Vertical ribs cover the corner Solid sheet gets the yield point : 140 MPa Totally/Partially Solid CornerTotally solid cornerPartially solid corner Top over stressed spots at contact pointsTop needs to be partially solid Corner Bottom over stressed spots at contact pointsBottom needs to be totally solid corner170 MPa300 MPaSafe Outer/Inner Sheets94Mpa102Mpa108Mpa74MpaBottom totally solid corner Top partially solid cornerStress DistributionSafe Vertical/Horizontal RibsOuter Sheet64MPa100MPa74 MPa Final Port Design Parameters (Mixed Ribbed Structure)Whole Vacuum VesselAll with ribbed structure (Inboard, Ports in addition to doors)All the ribbed configurations are made based on the stress distribution resultsNot identical on the top in addition to bottom(Stress Reasons)Door Ribbed StructureInboard24cm26cm Ribs with constant cross section : 4cm x 6 cm Matching between inboard & outboard rib channels 2cm4cm4cm Mahkee, Wells Navajo-Hopi Observer Managing Editor www.phwiki.com

Solid wall Stress Distribution113MPa95MPa100MPaAll regions are less than 119MPa 90MPa96MPa86MPaRibbed Structure Stress DistributionAll the ribs are less than 100MPaSummary & Future WorkA preliminary structural analysis of the vacuum vessel was per as long as med in addition to the locations of high stresses were identified on the solid single wall vacuum vessel S in addition to wich Panels theory was used to model the double wall ribbed structureS in addition to wich panel/ Double wall ribbed structure as a way to add little material on the structure to increase the bending stiffness in addition to eventually decreasing the stress intensity was consideredDouble wall ribbed structure provides us with sufficient space as long as the He coolantMixed ribbed structure configuration was analyzed in addition to designedDouble wall ribbed structure was analyzed in addition to designed as long as the whole vacuum vessel including the inboardMatching between coolant channels as long as the inboard in addition to outboard was considered Waiting as long as the disruption load data from UW to add it to the current load as long as further analysis. Thermo-Mechanical analysis based on the nuclear heating data from UW

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