Also...regarding QPL's... Does AIAA (copyright holder of NAS specifications) actually maintain QPL's? I know some consensus standards organizations do...like SAE for AMS... But I'm not actually familiar with AIAA doing so. I would also venture to guess that even if AIAA maintained QPLs, you...
JB:
I'm assuming you've tried all the "big" players. Here's a smaller, local to me, manufacturer that you might have some luck with. FYI: their website is showing NAS1956C13 in stock (qty. 108) and NAS1954C10 in stock (qty. 8). I can't comment on website accuracy. Good news is they're a...
SW and RB are correct.
To visualize in Femap, View>Options:
To understand how material orientations are defined/applied in Nastran, check your quick reference guide:
So...a digital escrow service? I can't recommend anything specific...but a quick internet search with those terms yields many options (even setting aside those specific to real estate transactions).
Hardware vs. software.
Hardware: MintJulep is on it...What do you want to measure? What resolution do you want to measure it at (both ADC resolution and sample rate)? We cannot answer this for you. Once you define the parameters, recommendations will be easier. Certainly, NI is on the...
You've hit the standard caveats...test...change in failure mode (i.e. shear-out)...etc.
Those stipulations aside, for a "ballpark understanding": CMH-17, Volume 1, Chapter 2 (section 2.3.5.5.4 in Rev. G) has a decent discussion on shear-out strength vs. "bearing" strength (bearing in quotes...
1. That's an unfair characterization of Elliot.
2. The TWERP program (Quickie with turbines) isn't the test program RoarkS is referring to. Suggest you look at the Titan Mustang program...perhaps it'll help you with context (and maybe even change your opinion about Elliot's abilities).
I've seen what sounds like similar things...multiple jobs/places. Example below is out of autoclave (oven cure, prepreg under bag)...
Initial vacuum drop (green oval in photo) during first temperature ramp which recovers, I believe to be moisture related... Moisture in the nylon bag, nylon...
I'm a little confused by the question. There are quite a few labs that'll do SEM work... SEM/EDX perhaps more appropriate to your case... Element and Intertek are a couple of larger (multiple locations) labs that could likely support this type of work.
Is that what you're looking for...just...
Interesting. Any idea as to why this might be? <edit: specifically, "this" meaning the difference between glass and carbon>
I've not thought about it prior to now...but...fiber properties? Glass fibers being isotropic and carbon fibers being anisotropic (transverse isotropy if I'm not...
Definitely agree with the others that 2D elements are more common.
That said, a few years back I had a project where 3D composite elements were better suited. I was using Femap as the pre/post and NeiNastran as the solver (this was before Autodesk purchased NEI and subsequently neutered the...
The other thing to remember is that the tables usually publish A, B, or S basis values, as identified within the tables. I have always interpreted the plots, labeled as "typical", as average/nominal/not statistically reduced, stress-strain curves.
As some others have inferred, I too find it difficult to quantify an answer to the question of "which school is better?" Too many variables, too many caveats, too much conflicting data. What I can provide, however, are subjective thoughts backed by anecdotal evidence.
-As a practicing aero...
