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@MASTERSTHESIS{Sambamurthy:1044179,
      author       = {Sambamurthy, Sivaraj Aditya},
      title        = {{D}esign and {FEA} {S}imulation of {I}nterference {F}it and
                      {A}utofrettage {P}rocess to {I}nduce {R}esidual {S}tresses
                      in a {H}igh-{P}ressure {C}ell},
      school       = {RWTH Aachen University},
      type         = {Masterarbeit},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich},
      reportid     = {FZJ-2025-03068},
      pages        = {82 p.},
      year         = {2025},
      note         = {Masterarbeit, RWTH Aachen University, 2025},
      abstract     = {High-pressure clamp cells for neutron diffraction
                      experiments require specialized construction materials that
                      do not attenuate neutrons, are not activated, are
                      non-magnetic and can withstand high pressures. Previous
                      research found two commercially available materials,
                      Nickel-Chromium-Aluminium Alloy (NiCrAl) and
                      Copper-Beryllium Alloy (CuBe2), for a compound cylinder
                      clamped-cell designed for a maximum working pressure of 2.3
                      GPa. This pressure exceeds the yield strength of both
                      materials and previously employed strengthening mechanisms
                      to combat this issue were found unsuccessful. This work aims
                      to enhance the mechanical strength of the NiCrAl inner
                      cylinder to ensure safe usage of the clamped cell at high
                      pressures of up to 2.3 GPa through autofrettage. The study
                      also investigates the optimization of the interference fit
                      between the inner NiCrAl cylinder and the outer CuBe2
                      cylinder, aiming to further reinforce the structural
                      integrity of the cell. Through theoretical study and
                      numerical analysis using ANSYS Mechanical [ANSYS], a swage
                      autofrettage process is designed. A composite tungsten
                      carbide mandrel with 0.04 mm interference to the inner
                      surface of the cylinder is used to achieve a $20\%$ peak
                      overstrain, resulting in an increase of up to 872.7 MPa of
                      compressive residual stresses in the hoop direction at the
                      inner surface. The interference fit of the cylinders, using
                      H7/r6 tolerance class, generates a contact pressure between
                      22.07 MPa to 186.3 MPa at the contact surface. After
                      autofrettage and interference fit assembly, the compound
                      cylinder cell withstands internal pressure of 2.3 GPa with a
                      minimum safety factor of 1.18, indicating safe operation
                      under these conditions. Based on the findings, it is
                      suggested to perform autofrettage first on a straight
                      cylinder, followed by machining its outer surface to a
                      tapered profile for the subsequent tapered interference fit
                      with the outer cylinder.},
      cin          = {JCNS-2 / JARA-FIT},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      typ          = {PUB:(DE-HGF)19},
      url          = {https://juser.fz-juelich.de/record/1044179},
}