|WikiProject Physics||(Rated Start-class, Low-importance)|
|WikiProject Engineering||(Rated Start-class, Low-importance)|
what is the relation b\w brittleness and density?
- None : Tungsten is heavy (19.25 g·cm−3) and can be brittle Lead is heavy (11.34 g·cm−3) and malleable (Lead glass on the other hand is brittle as well as heavy : 6 g·cm−3) Graphite is light (2.09–2.23 g/cm³) and brittle Aluminium is also rather light (2.70 g·cm−3) and malleable
"When used in materials science, it is generally applied to materials that fail in tension rather than shear"
I don't see why it should fail in tension more than shear. It might be true for bending where external fibers would break sooner than for a malleable material, but tension ? —Preceding unsigned comment added by 18.104.22.168 (talk) 12:10, 20 November 2007 (UTC)
"A material is brittle if it is liable to fracture when subjected to stress."
This is a very unsatisfactory definition of "brittle", since all materials (including ductile ones) will fracture/fail when subjected to sufficient stress. The term brittle refers to those materials that fail under stress without significant (plastic) deformation/strain, i.e. prior to the onset of general yielding. I invite discussion as to whether or not to include the word 'plastic' in the definition; a rubber band, when stretched at room temperature, will fail without deforming plastically even though the(elastic) strain may be over 100%. This doesn't really fit the general perception of brittle behaviour. It may therefore be better to omit 'plastic', and talk simply in terms of failure without significant [elastic or plastic] deformation. --Amgreen (talk) 13:38, 13 October 2010 (UTC)