Rear seat pan design
Rear seat pan design
(OP)
Hello,
I am interested in BIW construction, and particularly the rear seat pan. I know that to reduce weight some manufactures now use magnesium. Does anyone know what the design requirements are for such a component? Where can i learn about what kind of conditions, temps and loads such a component needs to resist?
many thanks
Chief
I am interested in BIW construction, and particularly the rear seat pan. I know that to reduce weight some manufactures now use magnesium. Does anyone know what the design requirements are for such a component? Where can i learn about what kind of conditions, temps and loads such a component needs to resist?
many thanks
Chief





RE: Rear seat pan design
Anyway, typically OEMs measure these things.
Cheers
Greg Locock
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RE: Rear seat pan design
With a good many cars nowadays, the thing that's on the other side of that seat pan (i.e. underneath), is the fuel tank - another reason to not make that out of something that can catch fire.
RE: Rear seat pan design
It maybe that I have asked for the wrong item. I know what the part is called in German, its the tanktrennwand which translates to tank partition wall. I am particularly interested in the materials used to construct this in the mercedes e class and how what loads it might have to withstand.
Any ideas anyone?
RE: Rear seat pan design
Your question concerning "body in white" suggests that no matter where this piece is, it is part of the welded structure. The "body in white" is all the stampings welded together, and the same comments still apply: Any part of the "body in white" has to be a material capable of being welded to the adjacent parts. If the "body in white" is steel then all the individual parts have to be steel. If it's aluminum, then everything has to be aluminum.
If you are talking about something else, please explain it.
RE: Rear seat pan design
That is the approximate result of dropping magnesium into salty water. I find it very hard to believe that an exterior part of a production car would be made fom magnesium, given that many markets salt their roads in winter.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Rear seat pan design
http://papers.sae.org/2000-01-1123
Modern magnesium alloy corrosion behavior (and thermal behavior) is much different than basic laboratory experiments.
RE: Rear seat pan design
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Rear seat pan design
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Rear seat pan design
http://papers.sae.org/2009-01-0037
RE: Rear seat pan design
Regards
Pat
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RE: Rear seat pan design
As to the original poster, still a bit confused as to what part you're asking about. Why not find a picture and circle it for us?
RE: Rear seat pan design
Nick
RE: Rear seat pan design
The gear boxed are actually very difficult to ignite, but once started they really go off. I must admit I tried to burn a broken one to see the display. A match evnm on a sharp edge would not do it. It took an oxy acetylene flame.
Despite my relative youth at the time, I lacked the courage or perhaps had the good sense not to aim a jet of pure oxygen at it after it was burning.
Regards
Pat
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RE: Rear seat pan design
Very sorry for the delay, but i now have more information about the part in question. SO I believe that the part sits in the rear of a 2 seater roadster prodcued by Mercedes. I have attached a picture of the part which is in composite, i found this picture on the web. Anyway I am interested, in what the design requirements are for such a component and what the actual industry name is for it. A descriptive specification would be great.
If anyone can help I will be grateful.
Cheers
RE: Rear seat pan design
Regarding the fire resistance of materials: steel will burn just fine, it will just take a higher temperature to ignite and usually requires external heat sources to maintain a flame. Using flammable materials on cars is done all over, it's just a matter of how much coating and retarding material used for these to be deemed safe. The entire interior of almost every production car is actually quite flammable. I wouldn't overly worry about some magnesium used in a panel that is not close to the engine, high electric current or brake heat.
RE: Rear seat pan design
Having been involved in some testing of plastics involved in a fire, some years ago, certainly agree with this..
Anyone who has seen ABS plastics and other synthetics first melt into a black tar like substance from adjacent flames, then ignite with the vigor of petroleum is convinced. This was with "flame retardant" compounds added which gives off bromine and chlorine gases when burned..
I now view the interior of my car as having a nice, comfortable coating of petroleum.. not the place to be in a fire.
Majority of plastics are after all, a petroleum by-product.