Talk:Elastic modulus
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[edit] Merge from elastica theory
i don't fully understand either topic, but they seem to both be short articles on very similar topics. could do with help from a proper physicist. i say we merge. thoughts? mastodon 15:38, 19 March 2006 (UTC)
Elastic modululus is Young's modulus; an equation relating strain to stress to give the strength or resisitance to stretching of a material. The other one is about the elasticity of a material in different directions, how far it will stretch/bend ect.
- I don't really think the two are closely related at all, but it's difficult to tell because of the extreme shortness of the Elastica theory. Ingoolemo talk 23:08, 21 March 2006 (UTC)
- Completely unrelated. Will expand elastica soon. deeptrivia (talk) 05:02, 29 March 2006 (UTC)
[edit] Unrelated Topics
The two topics are completely different.
The Modulus of Elasticity is a physical propterty of materials. It is the ratio between stress and strain. Once the Elastic Limit is met/surpassed for a particular element it can no longer be loaded/unloaded without resulting in deformation. As in the case of steel, the element stretches like taffy after reaching its Elastic Limit. In a stress/strain diagram, the Modulus of Elasticity is the slope of the line. When the Elastic Limit is reached, the graph is no longer a straight line. (The Modulus of Elasticity of structural steel is around 29,000,000 psi).
It seems as though the other topic is related more to deflection, which is basically how much something bends when it is loaded. Say, if you have a beam acting as a bridge with a fixed support on one end and a roller support on the other (rollers account for any change due to thermal stretching and allow a little horizontal movement in the beam so it doesn't get put under too much pressure). If you add a point load (that's an unmoving load-- eg a car or something) to the beam, the deflection is the maximum "sag" the beam moves from its original position to account for the loading.
There is a connection between the two topics in that deflection is the result of loading an item and the deflection is related to the Modulus of Elasticity. However, the two topics are not the same. One appears to be a theory concerning deflection and how a material bends and the Modulus of Elasticity is a measurable ratio of loading up to the Elastic Limit, when deformity/failure of a matieral begins to occur.
jadewik 30 March, 2006 (My first wikipedia post/comment... go easy on me *grin*)
[edit] Axial Modulus of Elasticity
Where does this fit in? It has no entry in Wiki, but Googling it seems to be used in engineering texts. 203.213.7.133 02:03, 20 March 2007 (UTC)
Seems to be another name for http://en.wikipedia.org/wiki/Young%27s_modulus. Can't give a reference, but the numbers seem to match. 203.213.7.133 03:30, 20 March 2007 (UTC)
