Talk:Orthotropic material

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The page has been cleaned up, even though it wasn't stupid or rubbish before. Glass is isotropic, not orthotropic. A silicon wafer is a single crystal of silicon, which is most definitely anistropic (with cubic symmetry) and neither isotropic nor orthotropic.--128.220.254.4 04:20, 12 February 2007 (UTC) --- this page is stupid and rubbish --- GLASS IS ISOTROPIC OR ORTHOTROPIC AND ALSO SILICON WAFER IS ISOTROPIC OR ORTHOTROPIC

[edit] Material Symmetry

Just a quick note regarding material symmetry: If a material has two mutually orthogonal planes of symmetry, then that material also has a third plane of symmetry (automatically). In other words there are no materials with just two orthogonal planes of symmetry. If two exist, then there are really three planes of symmetry. See Robert Jones, "Mechanics of Composite Materials", second edition, page 59. Gpayette 04:26, 10 October 2007 (UTC)