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Engineering Materials

Survey: Engineers Uncertain About CAFE Materials Choices

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Ann R. Thryft
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Re: CAFE Moving Target
Ann R. Thryft   8/26/2014 6:13:46 PM
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I think you've hit the nail on the head, Greg--it's all about uncertainty, coming from several different directions at once.



Greg M. Jung
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CAFE Moving Target
Greg M. Jung   8/26/2014 5:55:46 PM
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Great analytics in this article.  I found the last slide to be especially informative as the majority of respondents felt there would be an additional tightening of the already rigorous 2017-2025 CAFE standards and that they would be forced to design to a moving target of regulations (which caused more uncertainty).

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Re: Not which materials but whether they're sufficient
Tweet   8/26/2014 8:58:53 AM
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That's hitting the nail on the head: Will the choices currently available do the jobs they need to do? Safety cannot be assured when you've lightweighted everything. Momentum is conserved. If you take mass out of the car side of the car/truck crash scenario, then acceleration experienced by the car's occupants must go up, or the material must absorb that energy and dissipate it safely. I just don't see people spending $50k for a big styrofoam egg. 

Ann R. Thryft
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Not which materials but whether they're sufficient
Ann R. Thryft   8/25/2014 2:12:16 PM
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It's interesting that engineers now mention composites and mixed materials often enough that they rank as separate categories--that's new (see Slide 3). The uncertainty seems to be about both which material will be the most important: aluminum vs steel vs composites vs plastics. It also seems to be about whether the choices currently available for engineers to actually use will do the jobs they need to do.

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