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Anyone got a public domain resource on the joint efficiencies of staggered vs inline fastener patterns for lap joints in metallic structures? Thanks

There are many reasons to pick one over the other. Most are based upon what is most suitable to do from a practical standpoint. I am not sure how the depth of the compressive layers differ for each method. However, data (proprietary) which I have seen indicates that a cold-worked hole is...

I would have though compressive yield would be more conservative than bearing yield as bearing allowables are often higher than straight compressive yield. As to your question tho, if weight is not an issue, then I would be conservative as many other factors can play a role in your final lug...

Interesting discussions. Not sure I follow where the OP was going with this, but the original question about limit and service load work this way for me. A limit load is a once per lifetime load. Aircraft must not suffer permanent detrimental deformation. Service load is not a FAR...

Looking for some help here. I have a composite laminate in which each ply is represented by a layer of solid elements. There are 8 plies total, with the stacking sequence being [0/45/-45/90]s. A generic MAT9 card is used. When the property field is assigned, a material CID aligned with the...

Hah... The banks would be happy if they made 80/20 loans. Read that some were making 105% loans on expensive homes to cover closing costs. There were some smart people that played the game the same as the banks were... they got 105% loans on million dollar homes and then did not make a single...

The financial mess is alos a produce of the media. They hype it up and make people panic. That in turn cause more panic and a downward spiral insues. The bailout (no refered to as a rescue package) is flawed. If the gov't buys all these bad debts, then the taxpayer is saddled with all these...

bf109g, I ran into a similar problem. There is a Boeing document which covers these materials, although the document is proprietary. I only mention it as I do not know whom you work for. The alternative is to use the cutoff curves for aluminum alloys, thus ensuring you are as conservative as...

MrHiLok, If the stack up is fitting, T-Chord, panel, then if the freeze plug is confined to the T-Chord, no retention is required as it is trapped between the fitting and the panel. Another option is to use a countersunk freezeplug with the csk side between the fitting and the T-Chord. This...

What about dovetailing the parts together??

Contact the NRC-IAR lab (National Research Council of Canada - Institute for Aerospace Research). Many years ago they had a groovy biaxial testing machine. jetmaker

If your loading direction is parallel to the short edge distance, then you actually have a short end margin. You will take a hit both in bearing and shear/tearout. Likely tearout will govern if the material is thick enough to develop full bearing initially. In this condition, static loading...

Try the National Research Council of Canada - Institute for Aerospace Research, up in Ottawa. They had a biaxial test frame many years ago. jetmaker

Noor, Do not disagree with you, however, that is a local failure and in fact, does not truely constitute a failure in my mind. Bolt hole yielding is not critical unless the joint is a critical single path, limited bolt number joint. In fact, it is often important to have yielding around bolt...

Be careful tho, because the ignoring of SCF at ultimate load is conditional upon the material being ductile, of large net section, and static loading. Another note is that designing to limit load is not typically the critical condition for most materials used in aerospace as the ratio of yield...

All, Thanks for your inputs. I was planning on countering with a 20% bump and then if they don't come up to the 15%, I'll stay contract. I agree with Tick and 30osk in that benefits, at least what I accounted for are about 25-30% more on my salary. But also, there is the premium that the...

star for you bf109g...

All, I am currently a contract engineer, employed in a skill which is in high demand at present. I am considering a direct position with my current employer, but their offer in terms of salary seems to undervalue my ability. Currently I am being paid 53% more than what their salary offer is...

I've had a similar experience, albeit I was not a junior engineer at the time. I hung in there for 6 months during which my work ethic and confidence started to suffer. Things only got worse as time passed such that I quit with minimal notice. Just showed up, and told the manager that today...

ok, pretty close does not fly tho. However, if you calculate the properties based on minimum drawing dimensions and can show worse than those for the blended condition, then you are good. As for Peterson, it is in the notched bar section. It is a chart which shows that the variation in angle...