Talk:Toughness
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"...when suddenly stressed." : is the suddenly important/essential? Looks quite hard to pin down, and not very relevant surely? Out of my field, so I'll leave this one to someone more knowledgeable. 194.106.59.2 15:34, 25 Mar 2005 (UTC)
It says square inches1111, but then the math is inches cubed.
- For some reason this confuses a lot of people. The correct units are energy/volume (J/m^3 or in-lbf/in^3). This is dimensionally equivalent to force/area (N/m^2 or lbf/in^2). Toiyabe 15:18, 9 April 2007 (UTC)
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[edit] Toughness
It seems to me that the area under the stress/ strain curve is an indication of toughness but not the measure of toughness. Conventionally, the Izod or Charpy impact tests are used although the previous comment about the inexactness of defining "sudden" is valid. The Charpy and Izod tests give a value in Joules per square meter which then relates directly with the gamma term used by Griffith and the "G" used by Irwin in Fracture Mechanics equations. In this way, so-called Impact Toughness can be related to Fracture Toughness and the dimensional analysis balances.
Roger Tyler MSc
The area under the stress strain curve is twice the fracture energy per unit volume of a tensile sample; i.e. 'G'. This only hold when the stress-strain curve occurred through stable crack growth. Under stable crack growth the crack grows at equilibrium. Under unstable crack growth there is elastic energy which is transformed to kinetic energy of the two fractured half's. Toughness is not measured as Joules per square meter but as a pascal times squareroot(meter).
- "Toughness is not measured as Joules per square meter but as a pascal times squareroot(meter)" You are confusing toghness and fracture toughness. Tomeasy T C 12:48, 14 July 2011 (UTC)
Toughness is measured in your bakkie - and the Hilux is the toughest bakkie around! — Preceding unsigned comment added by 41.161.36.26 (talk) 12:48, 15 September 2011 (UTC)
'The simple understanding of tough..... a Toyota hilux is so tough it can even start a Land Rover.......and tear a hole in time!
[edit] Malleability?
I was given to understand that toughness also indicated a combination of hardness and malleability. Is this relevant to the article? Is it correct? Mydogtrouble (talk) 20:36, 22 April 2010 (UTC)
- Toughness is roughly inversely proportional to hardness and ductility, but it is not directly related. Wizard191 (talk) 20:58, 22 April 2010 (UTC)
[edit] Toughness is measured in J/m^2
It is the energy dissipated by creating a fracture surface of a certain size - the former is measured in Joule the latter in square meter, hence J/m^2.
Unfortunately the whole article talk about the senseless J/m^3, which would mean that the toughness of a rod under uniaxial tension is inversely proportional to its length, which is rubbish. For such a geometry, the toughness is a material property independent of the length of the rod.
I put this message here, because I plan to drastically change the article (provided I have the time to). If you disagree, please let me know. Tomeasy T C 12:46, 14 July 2011 (UTC)
[edit] Beyond Toughness
Beyond toughness describes what Toyota Hilux demonstrates and portrays. The unbeatable and unbreakable "workhorse" is an all round combination of durability, reliability and all round toughness...hence the "Beyond Toughness" terminology!]] — Preceding unsigned comment added by Zarabradshaw (talk • contribs) 13:59, 19 September 2011 (UTC)
