Calculations for the bolted helium vessel February 2nd 2015 Norbert Kuder, EN/MME.

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Calculations for the bolted helium vessel February 2nd 2015 Norbert Kuder, EN/MME

Input 2 Pitch p [mm] 0.8 Bolt diameter d [mm] 5 Tensile stress area At [mm2] Corresponding bolt diameter in ANSYS d1 [mm] 4.05 Pretension constant K 0.8 Titanium proof stress Sp [MPa] 225 Preload F [N] Wrenching torque T [Nm] 2.55 Top/bottom wall area A1 [mm2] Weight of the top/bottom wall Q1 [N] Larger side wall area A2 [mm2] Weight of the larger wall Q2 [N] Smaller side wall area A3 [mm2] Weight of the smaller side wall Q3 [N] Total weight (vessel + cavity) Q [N] Pressure Pr [MPa] 0.18 Force from pressure F1 [N] Force from pressure F2 [N] Force from pressure F3 [N] Coefficient of static friction μ 0.3

Number of bolts 3 y x z

Calculations Shear Carried by Friction 4 F2F2 μ F Q + F 1 FfFf F3F3

Calculations Shear Carried by Bolts 5 F1F1 F2F2 1 top side larger side F1F1 F3F3 2 top side smaller side F2F2 F3F3 3 larger side smaller side

Calculations Shear Carried by Bolts 6

Calculations FEA 7

Contact 8 For each bolt the washer face was projected onto the adjacent faces of the walls and after that the faces were sticked. washer bonded contact

9 Stress on cavity (TBC)