HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
<<  <  Page 2/3  >  >>
NaperOwen
User Rank
Iron
Re: Pretty wide of solutions
NaperOwen   5/2/2012 4:15:27 PM
NO RATINGS
NaperLou,

Is it possible to talk to you off-line?

 

Owen

Dave Palmer
User Rank
Platinum
Re: Pretty wide of solutions
Dave Palmer   5/2/2012 2:27:53 PM
NO RATINGS
@BigDipper: Design News actually had an article last year which mentioned the Polimotor.

BigDipper
User Rank
Iron
Re: Pretty wide of solutions
BigDipper   5/2/2012 2:15:33 PM
NO RATINGS
Ann,

Plastic has been user in firearms for decades - the Remington Nylon 66 was introduced in 1959 - but only recently in components other than stocks.  Perhaps the best know weapon with a plastic stock is the M-16 of the Vietnam era.  Now plastic frames, magazines, triggers and guards, and other components are routinely found in all types of firearms. 

More on topic with the automotive direction of the blog, does anyone remember the Polymotor® from the mid to late 90's?  As I recall most of the components, inluding the block and head, were made of plastic with metal inserts in high wear/high stress/high temperature areas.  I believe the entire engine - it was a 2.0 liter 4 cylinder racing engine - weighed ~ 200 pounds.

Ann R. Thryft
User Rank
Blogger
Re: Pretty wide of solutions
Ann R. Thryft   5/2/2012 1:45:42 PM
NO RATINGS
naperlou, thanks for that input: plastic in firearms is a new one to me. That must be a very demanding application: heat, force/impact, etc.
In automotive lightweighting, much of the materials design effort is to combine lighter weight composites and plastics with additional safety features.

Dave Palmer
User Rank
Platinum
Re: PC/ABS
Dave Palmer   5/2/2012 1:36:04 PM
NO RATINGS
@Ann: Well, I'm not sure which metals SABIC is thinking of which crack or fade from exposure to high temperatures or ultraviolet light! (Certainly not if "high temperatures" are defined as temperatures which would be high for plastics).

As far as fiberglass is concerned, I don't doubt that PC and PC/ABS have better weatherability than a fiberglass-epoxy composite.  But I think they are trading one problem for a potentially worse one.  Fiberglass has excellent chemical resistance.  With PC and PC/ABS, you now have to worry about splashing gas or oil on the hood of your tractor. (Not to mention pesticides and other chemicals).

An injection molded hood will be cheaper and lighter than a compression molded composite hood or a formed metal hood.  But I'm very skeptical of SABIC's claim that the performance will be better.

PC and PC/ABS might look attractive compared to other injection molding resins because of their impact strength, but their chemical resistance is not very good.  Better choices might be BASF's Terblend, or Ineos' Triax, both of which are nylon-ABS blends. (They used to be competing products, but since BASF and Ineos combined their styrenics divisions into one company called Styrolution, they're now both under the same roof).

Rob Spiegel
User Rank
Blogger
Re: Pretty wide of solutions
Rob Spiegel   5/2/2012 1:30:56 PM
NO RATINGS
BillFZ1, Am I reading you right that the fiberglass has some crumple give for safety reasons? I take it plastic does not share that quality. 

Ann R. Thryft
User Rank
Blogger
Re: Pretty wide of solutions
Ann R. Thryft   5/2/2012 12:58:02 PM
NO RATINGS
Thanks, Chuck. Those battery frames were a total surprise to me. If they were to you, too, then it must be one of those best-kept secrets.

Ann R. Thryft
User Rank
Blogger
Re: PC/ABS
Ann R. Thryft   5/2/2012 12:56:03 PM
NO RATINGS
Thanks for that input, Dave. As the (correct) caption states, "The new formulation was developed to help overcome performance issues of fiberglass and metal, such as cracking or fading from exposure to high temperatures and ultraviolet light. SABIC's Lexan SLX resin is co-extruded over its Cycoloy resin and vacuum formed..." When talking to SABIC, they made it clear that they had worked closely with Apache to develop this material and overcome previous difficulties. The same goes for the white Volvo truck cab roof fairing made entirely from SABIC's Cycoloy polycarbonate/ABS resin, which they worked closely on with Volvo.

kenish
User Rank
Platinum
Re: Pretty wide of solutions
kenish   5/2/2012 12:34:51 PM
NO RATINGS
@Nadine- I have a keen interest in motorcycle and bike helmets as a rider of both and as an engineer.  As others mentioned the best-performing motorcycle helmets use fiberglass, or lately Kevlar or carbon fiber for very high-end products.  Polycarbonate is used for "budget" motorcycle helmets. They are heavier and there have been a few cases of splitting along mold lines in an impact.

You're correct that some of the new materials and processes in this article may shift the advantage back to plastics in helmets.  (BTW, bicycle helmets are almost always a thin plastic shell with a thick polystyrene liner).

An aside- one big area for improvement is a truly "quiet" motorcycle helmet.  The best helmets available still deliver 100+ db of wind noise at highway speeds, making earplugs a necessity.  Most riders don't use earplugs...probably a source of regret in 10 years.  (Mild tinnitus is my personal toll for not using them earlier)

BillFZ1
User Rank
Gold
Re: Pretty wide of solutions
BillFZ1   5/2/2012 12:12:11 PM
NO RATINGS
Nadine,

I worked in the motorcycle business for many years. Helmets have always been the trickiest thing to make. Plastic helmets have been manufactured, but the best, lightest helmets have always been fiberglass. The reason is that the plastic shells were actually too durable! Thin fiberglass can be talored to crush and abrade at specific rates. The shell actually is designed to crumple like the front and rear zones of modern cars. The newest plastics will probably be able to take over soon, but so far the best helmets are fiberglass construction.

Bill

<<  <  Page 2/3  >  >>


Partner Zone
Latest Analysis
Factory floor engineers may soon be able to operate machinery and monitor equipment status simply by tapping their eyeglasses.
GE Aviation not only plans to use 3D printing to mass-produce metal parts for its LEAP jet engine, but it's also developing a separate technology for 3D-printing metal parts used in its other engines.
In this TED presentation, Wayne Cotter, a computer engineer turned standup comic, explains why engineers are natural comedians.
IBM's new SyNAPSE chip makes it possible for computers to both memorize and compute simultaneously.
The “Space Kid,” 11, will be one of the first civilians to have his design manufactured in space by NASA, thanks to the City X Project, which inspires kids to think about new 3D-printed inventions that could be useful for humans living in space.
More:Blogs|News
Design News Webinar Series
9/10/2014 11:00 a.m. California / 2:00 p.m. New York
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Sep 22 - 26, MCU Software Development – A Step-by-Step Guide (Using a Real Eval Board)
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: September 30 - October 2
Sponsored by Altera
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service