<<  <  Page 3/3
Cabe Atwell
User Rank
Re: "The modulus of rupture is zero"
Cabe Atwell   12/20/2012 3:37:29 PM
Which is worse for the environment, manufacturing these composite materials or logging the equivelent amount of wood?

I like the idea of composite bridges and buildings though. Perhaps people would not have lost that much with Hurricanes Katrina or Sandy. I'm sure the current cost differences will keep the materials out of construction for years to come.


Dave Palmer
User Rank
"The modulus of rupture is zero"
Dave Palmer   12/20/2012 1:32:19 PM
Okay, I'm pretty sure that "the modulus of rupture is zero" is not a correct statement.  "Modulus of rupture" is a measure of the load-carrying capacity of a beam.  A material with a load-carrying capacity of zero would not be very useful.

The modulus of rupture formula is only correct up to the elastic limit, so presumably the meaning of the statement is that it yields before it breaks.  That's also how I'd interpret the rather amazing statement that "it does not have a catastrophic failure mode."  If it doesn't fracture under any circumstances, it's be a miracle material, and they should be contacting physics journals rather than Design News.  But I think they are just saying that it yields before it breaks.

That being said, this sounds like a pretty neat material.  Mineral-filled polypropylene is a fairly common (and reliable) engineering material.  However, making it into an open-cell foam, and drawing it so that the polymer chains are oriented, is an interesting innovation.

User Rank
Better wood than wood
naperlou   12/20/2012 12:17:41 PM
Ann, this is an interesting material.  It is impressive that it can be used like wood, using the same tools and fasteners.  That should make acceptance easier.  The hurricane resistance should be of much interest in areas where that is a problem.  I know someone with a place in Florida, and although the structure is concrete and quite resistant, they had to replace windows with bullet proof ones.  Other structures, those with conventional roofs, are a real problem.  This material would help. 

<<  <  Page 3/3

Partner Zone
Latest Analysis
Governmental policies and mandates in Europe are leading the way in creating low-carbon manufacturing.
Digital healthcare devices and wearable electronic products need to be thoroughly tested, lest they live short, ignominious lives, an expert will tell attendees at UBM’s upcoming Designers of Things conference in San Jose, Calif.
Designers of electronic interfaces will need to be prepared to incorporate haptics in next generation products, an expert will tell attendees at the upcoming Designers of Things conference in San Jose, Calif.
According to a Randstad Engineering compilation of salary studies, engineering salaries are increasing beyond inflation, with employers paying to keep potential suitors away from their employees.
The company says it anticipates high-definition video for home security and other uses will be the next mature technology integrated into the IoT domain, hence the introduction of its MatrixCam devkit.
Design News Webinar Series
11/10/2015 11:00 a.m. California / 2:00 p.m. New York
10/29/2015 11:00 a.m. California / 2:00 p.m. New York
10/20/2015 8:00 a.m. California / 11:00 a.m. New York
12/2/2015 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.
Jul 6 - 10, Building Raspberry Pi Controllers with Python
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7

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.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2015 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service