Calculating strength of bolt on longitudinal flange of a cylinder
Calculating strength of bolt on longitudinal flange of a cylinder
(OP)
Hello guys,
I´m currently trying to analyse the strength of a bolted joint between two halves of a cylinder. The cylinder is subjected to torque on one end and fixed on the other end.
The top and bottom halves of the cylinder are connected by means of a flange and bolted connection as shown in the attached file.
Please help
I´m currently trying to analyse the strength of a bolted joint between two halves of a cylinder. The cylinder is subjected to torque on one end and fixed on the other end.
The top and bottom halves of the cylinder are connected by means of a flange and bolted connection as shown in the attached file.
Please help





RE: Calculating strength of bolt on longitudinal flange of a cylinder
The gasket will be twisted and forced tighter at one area where the two flanges are forced together by the torque; and be twsited and lifted apart at another area. So, you will get too little force clamping the gasket material in one region (it will leak), too much at another area (it will deform and leak), and a motion in the areas between (it will leak).
Lock the two PV halves together with at least 4x keys or tapered dowel pins (machined in placed AFTER the final torque of the bolted halves is complete). The keys take the torque, the gasket material has enough problems just trying to stop the leak.
If you think you can take a metal-metal fit, look at the flange requirements (sizes, thickness, precision flatness, manufacturing expense, size of bolts, bolt-torquing precision and methods and expense, etc) needed to seal the turbine casing and compressor casing flanges.
RE: Calculating strength of bolt on longitudinal flange of a cylinder
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(2B)+(2B)' ?
RE: Calculating strength of bolt on longitudinal flange of a cylinder
If this is rigid enough to not deform then the load on the bolts are simply derived from the moment. However I would expect some deformation and the bending/shear loads would need to be added to the bolt load.
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P.E. Metallurgy, Plymouth Tube
RE: Calculating strength of bolt on longitudinal flange of a cylinder
There is no internal pressure present. The assembled cylinder will serve as a torque-tube and therefore only needs to be able to resist the torsion applied to it. There may be marginal deformations (80 mrad) within the tube, however accuracy is very important.
RE: Calculating strength of bolt on longitudinal flange of a cylinder
Are you sure about your units? 66,577 kNm? That's over 49 million foot-pounds. That's a lot! this is going to be a very substantial structure. You better make sure your stress analysis is accurate and thorough.
RE: Calculating strength of bolt on longitudinal flange of a cylinder