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What is the difference between these two grades, if any? And what could be the reason for picking one over the other? As far as I could see, F55 has tungsten in its chemical composition.

Ed, thanks for the clarification. I think I meant to ask is that some material specs give you an impact energy value to test against (20lb-ft for example). Other specs don't specify a value. In this case, how is the impact energy acceptance criteria decided?

ASTM A370 specifies a range of impact energies that can be used as an acceptance criteria for a Charpy impact test. How do you decide what impact value to use for a particular specimen size? Some material specs state the impact energy acceptance criteria and temperature that the test has to be...

desertfox, Thanks for the link. That really clears it up! :)

I was looking at calculating the bending stress on bolts due to a combined load and came upon this link http://www.roymech.co.uk/Useful_Tables/Screws/Bolted_Joint.html Could someone explain the formula Fnt = ( Fv. Rv + Fh. Rh) . Vn / (V1^2 + V2^2....Vx^2)? Especially the denominator. I've...

Thanks Demon3. The orientation of the glass fibres makes sense in terms of strength. What do you mean by PTFE not melting?

How much does the mechanical properties of polymers like PTFE or PEEK change depending on the process it was formed from? For example a billet formed from extrusion as opposed to a billet formed from moulding. We buy in valve seats to an internal spec which says that the raw material can be...

BenStewart - Thanks for that, I'll take a look.

What exactly are meant by tangential stresses in the context of Appendix 2. I've just done some calculations but I'm trying to understand what direction these stresses act in. Are these the forces caused by the inward bending of the flange due to the bolt load?

Thanks for the suggestions everyone. I'm creating an excel spreadsheet that calculates the reactions, shear, moments, displacements. I took rb's idea to use moment distribution method and it's working out pretty well so far. Structural Analysis by Hibbeler has a nice section on it. I'm...

How can I get the final deflected shape using the method of superposition? My cantilever has 3 spans with 4 supports. See the pic attached which I've drawn using my new-found paint skills [bigglasses]. At the fourth step, I only know how to get the deflected shape when either of the two middle...

Yes I'm doing a hand calc to verify the FEA. I should've been a bit more clear, those three points were arbitrary points and depending on the situation, there can be more or less of them. I just put them there as an example.

The caissons I'm analyzing are fixed at multiple locations along its length using guides. These guides are assumed to fix the caisson in place and I'm modelling it assuming that no rotation is allowed at the guide locations. So according to that, the spreadsheet outputs a similar solution to the...

STAAD outputhttp://i.imgur.com/5XW36Ia.png

Thanks for your help. I used your idea but I split my beam (3 spans) into 3 individual beams, fixed at both ends. Then I was easily able to find the reaction forces at each end. Here's the output from STAAD.Pro and Excel. The scales are exaggerated but the actual forces turned out to be roughly...

Sorry I mean how to calculate the reactions, not deflections.

Hi, I'm trying to calculate the reaction forces on a vertical continuous beam (seawater caissons on offshore platforms if anyone's interested). I'm doing this in Excel. So far I've been able to calculate everything up until deflections if the beam was a cantilever but I'm not sure how to...