Summary of Thermo-mechanical analyses of the HOM couplers Carlo Zanoni EN-MME-EDM Goal HOM no bellow Comparison (same mesh and defeaturing) - Stress - Deformation H HOM V HOM Materials properties Stainless Steel 316LN Poisson’s ratio [1] 0.38 0.27 Elastic modulus (GPa) [1] 103 196 Yield strength Rp0.2 (MPa) 75 280 Properties Integrated thermal contraction 1.43∙10−3 3∙10−3 4.91∙10−6 1.03∙10−5 Yield strength Rp0.2 (MPa) [3] 480÷520 850÷1050 Max allowable stress Rp0.2/1.5 320÷347 567÷700 293 K Niobium 2K Material Δ𝐿 𝐿 𝑅𝑇→4𝐾 Coefficient of thermal contraction [2] Δ𝐿 Δ𝑇𝐿 𝑅𝑇→4𝐾 (1/K) [1] D. Vaucoret, Materials and Ansys Library for Design Office, EDMS 1291793. [2] H. Kaiser, Ge. Meyer, H.B. Peters, and G. Weichert, “Helium Vessel for the TTF Cavity,” TESLA Collaboration Report 94–26, October 1994. 3 [3] Information provided by Ignacio. Loads (nominal) • Temperature (22 C to -271.15 C) • Pressure: 0.18 Mpa • HOM line load: 20 N at 500 mm • Boundary: • Remote displacement of the bolts of the horizontal flange • Δ gap: Temperature contraction • Max stress: temperature and pressure • Modes: Temperature contraction No bellows No bellows (HOM line + pressure) Horizontal Bellow Horizontal Bellow (HOM line + pressure) Radial Bellow Radial Bellow (HOM line + pressure) Deformation (contraction + HOM line load) Direction of hook movement changes with different designs Deformation 1st Mode: 92 Hz Nb tube from plate No Bellows Δ gap Nb tube from bulk 0.11 mm 0.08 mm 240 MPa 150 MPa/150 MPa (nominal) Max Stress (nominal/5 kg HOM line) 1st Mode Horizontal Bellow Δ gap 92 Hz 0.1 mm 0.08 mm 54 MPa 32 MPa/54 MPa (nominal) Max Stress (nominal/5 kg HOM line) 1st Mode Radial Bellow Δ gap 92 Hz 0.1 mm 0.07 mm 66 MPa 38 MPa/50 MPa (nominal) Max Stress (nominal/5 kg HOM line) 1st Mode 92 Hz
© Copyright 2024