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Engineering Materials

Auto Composite Production on Fast Track

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naperlou
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A different type of car
naperlou   5/21/2012 10:34:48 AM
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Ann, this is a good use of government research funds in both countries.  One thing people should understand, though, is that race cars and passenger cars have very different structures.  Personally I think we should produce passenger cars more like race cars, but I don't design them.

Race cars generally have some sort of frame (often a space frame) that supports all the mechanical equipment and the driver.  The body then sits on this frame giving it the aerodynamic properties desired.  The frames are generally designed so that in a crash the driver is well protected in a strong cage and the car dissentigrates around him (or her).  It works fairly well.  You will sometimes notice at races a car with the body off.  The only car I know of in the US that has a separate body is the Corvette.  The fiberglass body has been a design feature of this marque for decades.  The cars are very lightweight and of a very high performance.  If you compare other high performance vehicles (such as the Jaguar) you will notice that they weigh at least two tons compared for about 2,600 lbs for the Vette.  So, without a sophiscated engine the Vette can easily match the performance of these more expensive vehicles. 

It would be interesting to understand why the separate frame concept has not been more widely embraced.  With metal bodied cars and integral body and frame can be lighter that standard production.  Of course, such cars are harder to repair.  With composites, even in non-structural applications, the cars can be much lighter and fuel effecient.

Ann R. Thryft
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Re: A different type of car
Ann R. Thryft   5/21/2012 12:12:49 PM
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naperlou, I've also wondered why the separate body or whole-body concept has been used in race cars but not in commercial automobiles. Offhand, you'd think that it would not be a problem in the highly automated high-volume production lines of passenger cars. I do know it's being considered.

Charles Murray
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Re: A different type of car
Charles Murray   5/21/2012 7:36:15 PM
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I've heard the same thing, Naperlou. The difficulty seems to have been in the repair costs.

Jerry dycus
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Re: A different type of car
Jerry dycus   5/21/2012 11:09:40 PM
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   Building my first  Freedom EV prototpye body/chassis only took 10 manhrs as a 1 off from the production molds.  If in real mass production using 3-4 person teams it could be cut to 2 manhrs/car so labor is a rather small part.

  I just don't see the canard that composites are too expensive, labor intensive especially when it costs $1B to set up a steel production line.

  My Miata size 2 seat sportwagon only uses 235lbs of composites with present OEM prices on non CF composites running $2-$4/lb the math clearly says composites are very cost effective against steel.  I've been doing car size composite vehicle constrution for 45 yrs now, mostly highly stressed boats. And don't forget the bigger motor, brakes, suspension, etc needed to move the 5-600lbs of steel version adds to steel's cost.

If you need higher production just have more lines.

While steel is a little cheaper/lb it costs far more to stamp, weld, fair, paint than composites.  Which combined with the fact that they don't rust and only needing a 100 unit run  vs 100k/yr for steel to make a good profit and you can see why big auto is dragging their feet on all composite cars.

And it's expensive CF they use to claim composites are too costly when medium tech FG and Kevlar type fibers are stronger in the right ways at 10% of CF costs.

They are doing the same with EV's making them overweight, very expensive when they could have been made for under $10k for an 80 mph, 80 mile range 800-1000lb commuter, towncar in composites like I'm building.

And it's only taking a 50lb gasoline 5kw generator to give it unlimited range.  

 

ChasChas
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Re: A different type of car
ChasChas   5/22/2012 10:33:19 AM
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Both construction methods work fine.  Remember monocoque construction in racing? Probably where the unibody came from. 

It seems that the method is determined by what material is used. Carbon fiber makes better structural beam type products than a structural sheet type products (unless you honeycomb). And then there is the welding or fastening methods. Beams take conventional fasters well. We are stuck with adhesives or bonding for structural sheet construction.

The story talks about replacing cast iron parts with lighter material as well. Interesting!

Ann R. Thryft
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Re: A different type of car
Ann R. Thryft   5/22/2012 12:08:36 PM
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Chuck, thanks for that input. Looks like the automotive industry, as well as the aerospace industry, may need the robots and lasers repair approach I reported on last week:
http://www.designnews.com/author.asp?section_id=1392&doc_id=243715

Scott Orlosky
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Re: A different type of car
Scott Orlosky   5/26/2012 4:08:53 PM
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I think it's great when consortiums come together to focus on a specific issue like this.  It means that something will actually get done.  Often it also means that eventually there will be cheaper carbon fiber "shapes" like angle, tube, I-beams available to the consumer market as well.  Maybe those $5000 CF bicycle frames will become affordable to the common man (or woman) after all.

birdie
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collaboration towards a national goal
birdie   5/29/2012 5:23:15 PM
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It is amazing to me that 70+ entities in Germany got together to work on a common problem as collaborators. 

Ann R. Thryft
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Re: collaboration towards a national goal
Ann R. Thryft   5/30/2012 1:10:19 PM
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I was also impressed at the number of companies getting together in this consortium. I think the motivation levels in this industry for transitioning to automotive manufacturing are very high right now.

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