:I'm probably disclosing allot more than I should, but:
:The side skirts are fabricated using 14 plys of Epoxy - Fiberglass tape with a tensile strength of 56 ksi.
14 layers of 'fiberglass tape', wont allow you to layup across the bias at either 90, 45, or even 22 degrees between plies.:Each hinge is mounted using 3 each 3/16ths diameter Titanium Hi-Loks (per hinge half).
:There are three hinges per skirt.
:The fasteners have a capability of 4800 lbs each, the hinge joint itself has 14400 lb capability (per hinge half).
Which Hi-Lok? HLTs or HLs? Eitherway, I dont see a single 3/16" Hi-Lok with 4,800lbs of Double Sheer or Tension. Myself, I'm an HL18PB70 or HL19PB70 kind of guy. Either way, I rarely use Hi-Loks. Besides at $20+ per fastener (including the collar), we both know you stole these from your employer. Nice.
(Side note for everyone: Typically, when attaching a carbon faggot composite structure to a non composite structure (metal), you'd ideally use a Titanium Fastener to prevent dissimilar metal corrosion (from the fastener to the carbon). You'd also have to impregnate the carbon faggot composite with a sleeve (delrin/phenolic/passivated stainless) to prevent delamination of the composite. For S2zs application he used the least most desireable fastener. Anyway, if you wanted a fail point, you should have just used some nice and soft MS20426D or MS20470D rivets ($.01) and let them sheer. They'd fail before the hinge or the fiberglass. Speaking of, I couldn't find ANY numbers on standard MS20001 or MS20257 hinge stock. Maybe you 'analyzed' it using allowables for the material only. Q: Is it the pure weight of the side skirt that keeps it in place during aeroloading? My initial design of a functional aerodynamic underbody skirt takes this into consideration. It's a very simple, if not completely ghetto solution. :(which is more than the weight of the car)
:Without going thru the inter-laminar shear (ABD&E matrix shear stess) details, (which the majority of participants on this forum wouldn't understand anyway)
Raises hand. I'm in. Go nuts, cause all you have is 14 layers of unidirectional layup + epoxy. There was no need to go through an analysis for this part. So, I want to see it. :the side skirts at 14 balanced ply lay-up are adequate for the task, but are intentionally designed to be the "weak link" in case of a direct collision.
How are the plys 'balanced'? If it's prepreg tape, then "effing duh". If it was a wet lay up and you used a scrim sheet, then, "effing duh". If you used a scale and a grinder... oh my. :I have completed a formal stress / design analysis, because that's what I do for a living.
This doesn't necessarily mean you do it well. Just show us some screen shots of your CFD analysis and maybe a model or two. PS, I used Patran and Catia on a smartteam backbone to do my design validations before it goes to the stress department. They are too lazy to import the data and create the nodes themselves. :Am I willing to disclose that information on this forum?
:Hell no... Would you?
I do. I did a mediocre CFD disertion on the analysis of the stock fuel rails, the border fuel rails, and the 'competion'. it's posted here in the archives someplace. You still have not shared anything meaningful to the community other then photos of your Z. :Try introducing something new and "different" on this forum yourself.
:Show the participants on this forum what you are capable of doing.
:Show us your abilities and craftsmanship.
:Until you've done that, you have nothing to stand on other than "crying wolf"...
Raises Hand. Done, 10 times fold... Maybe even 11.
Petz #3
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