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Unformatted text preview: Section 4.7 Solid Mechanics Part I Kelly 163 4.7 Failure of Elastic Materials In terms of material behavior, failure means a change in the normal constitutive behavior of a material, usually in response to excessive loads or deformations that cause irreparable changes of the microstructure. For example, compressed rock will respond elastically up to a certain point but, if the load is high enough, the rock will crush with permanent deformations. A model of crushing rock will involve a non-elastic constitutive law and is hence beyond the scope of elasticity theory. However, at issue here is the attempt to predict when the material first ceases to respond elastically, not what happens after it does so. The failure of a specimen of rock under uniaxial tension 1 can be predicted if a tension test has been carried out on a similar rock it will fail when the applied tension reaches the yield stress Y (see 4.2.1). However, the question to be addressed here is how to predict the failure of a component which is loaded in a complex way, with a consequent complex stress state at any material particle....
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This note was uploaded on 01/20/2012 for the course ENGINEERIN 1 taught by Professor Staff during the Fall '11 term at Auckland.
- Fall '11