1. Luca Dassa – 23/02/2015 1 / 8 CRAB cavities meeting Preload Bolt size (1) Shear load: 602 N (p=0.26 MPa) -> Min preload: 2006 with Static friction coefficient: 0.3 Shear load: 602 N (p=0.26 MPa) -> Min preload: 6020 with Static friction coefficient: 0.1

2. Luca Dassa – 23/02/2015 2 / 8 CRAB cavities meeting AXIAL + BENDING + SHEAR Pressure: 2.6 bara (0.26 MPa) / Vessel weight / Static friction coefficient: 0.3 Shear load: 602 N Bending moment (16.5 mm) = 4964 Nmm / Bending moment (11.2 mm) = 3369 Nmm Bolt size (2)

3. Luca Dassa – 23/02/2015 3 / 8 CRAB cavities meeting ONLY SHEAR Pressure: 2.6 bara (0.26 MPa) / Vessel weight / Static friction coefficient: 0.3 Shear load: 602 N Bolt size (3)

4. Luca Dassa – 23/02/2015 4 / 8 CRAB cavities meeting FEA: Frictionless (coarse mesh) Shear on bolts Bending moment on bolts WARNING: p=0.18 MPa Warning: overloaded bolts beyond elastic limit! Bolt size (4)

5. Luca Dassa – 23/02/2015 5 / 8 CRAB cavities meeting Deformation on the weld seam Max def = around 0.1 mm Bolt size (5)

6. Luca Dassa – 23/02/2015 6 / 8 CRAB cavities meeting Report Load cases

7. Luca Dassa – 23/02/2015 7 / 8 CRAB cavities meeting Weld seam sizing (long edge) Bolt cover