You can also multiply the density of your grain flow with bearing load of the spoke and velocity of the flow squared to get the force exerted by the medium. Basic fluid dynamics, F = p A v^2 = kg/m^3 X m^2 X (m/s)^2 = N.
Regards,
Cockroach
I have done this before, using elliptical relieves instead of standard rounded fillets in the corners of stepped shafts. Usually 3:1 ellipses give the lowest concentrations of stress, about 25% less or so.
Is this what you are trying to do? Finite element on the shaft is how I solved my...
Just look up Lifting Capacity for threaded fasteners in any decent book on mechanics. Or Google it, many engineering websites spell it out in detail.
Regards,
Cockroach
I don't think it is that easy, the first sentence in the section on stress says it all. Thread stress computations are complicated!
The Buttress is a tapered thread form and therefore, equations associated with shear and bending are not the same as those for a straight thread. Several studies...
Handle it like a cantilever beam with shear, bending, rotation and deflection. You can correlate deflection to shear in the linear range of the material by calculating the bending stress at the support of the cantilever.
Regards,
Cockroach
No, you approach the problem egronomically.
Have a technician press on the piece repeatably for eight hours a day, five days a week. Correlate acceptance to rejection critia; what can go wrong? Define some level of acceptability between mating pieces and break out operator induced rejections...
Yes, I upgraded ProE to SolidWorks. That software took care of the issues you raised and solved a lot more problems than I had experienced to date. Perhaps you need a friendlier software package and support group who actually care about the end user. ProE boys just want to sell you the...
Would it not be a safety issue? Usually this is where I get the resistance.
NPT forms are particularly weak in shear, any side load, wanted or unwanted, would snap the relief valve off at the stem. This would have a tremendous amount of safety concerns given your medium is a jet fuel. Often...
Using mild steel (43 ksi) typical of off the shelf tubing, I get an OD of 1 3/16 inches. This assumes your 24 kip pre-load with 8.5 kip external compressive load will give you a factor of safety of 1.25. As noted, you want to resist collapse in which case the pre-load would be lost...
You know what? I'm going to take this on and develop it. What is the required centre-to-centre distance for the thru holes (i.e. ears) and those of the bolts? Safe working load is 10 kips, but the design will be tested to 30 kips, FOS=3.
I hope those set screw looking fasteners in the front...
Basic physics. What is the angle of an inclined plane given a block of known weight subject to friction? Figure it out using a textbook example and comparing it to other known problems with solutions.
Then make the inclined plane move at some prescribed velocity and ask the same question...
