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Toughest material

by jmarcian
Tags: material, toughest
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jmarcian
#1
Mar3-09, 11:36 PM
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by terms of "mechanics" (physics, not the ones that work on your car). toughness is shown as the area under the curve of a stress strain diagram. from the we can say that this material offers a high ultimate strength, but also can strain a fair amount before breaking....
with that definition, what would you say the "toughest" material is?

also, would carbon-fiber nano tubes be considered brittle or ductile?

also, can brittle materials be as tough as ductile ones?


thanks
jared
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Mapes
#2
Mar4-09, 09:48 AM
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I'll nominate steel for toughest material (based on an Ashby chart of toughness).
Topher925
#3
Mar4-09, 11:05 AM
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Toughness is basically the specific amount of energy a material can absorb before it fails.

I don't think you can classify nano-tubes as either since we can't manufacturer them in a pure lattice form yet.

And no, brittle materials are usually not as tough as ductile ones.


Quote Quote by Mapes View Post
I'll nominate steel for toughest material (based on an Ashby chart of toughness).
I seriously doubt that.

If I had to guess I would say Kevlar.

Mapes
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Mar4-09, 11:25 AM
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Toughest material

Why guess? TRIP steels have a KIC exceeding 200 MPa-m1/2. Which Kevlar composite exceeds this?


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