Material failure theory | Wikipedia audio article
Channel: Subhajit Sahu
Date: 2018-12-27

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Material_failure_theory


00:01:15 1 Material failure
00:02:03 2 Types of material failure
00:02:21 2.1 Microscopic failure
00:03:43 2.2 Macroscopic failure
00:04:45 3 Brittle material failure criteria
00:05:14 3.1 Phenomenological failure criteria
00:07:47 3.2 Linear elastic fracture mechanics
00:11:19 3.3 Energy-based methods
00:13:50 4 Ductile material failure criteria
00:15:34 5 See also



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SUMMARY
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Failure theory is the science of predicting the conditions under which solid materials fail under the action of external loads. The failure of a material is usually classified into brittle failure (fracture) or ductile failure (yield).  Depending on the conditions (such as temperature, state of stress, loading rate) most materials can fail in a brittle or ductile manner or both.  However, for most practical situations, a material may be classified as either brittle or ductile. Though failure theory has been in development for over 200 years, its level of acceptability is yet to reach that of continuum mechanics.
In mathematical terms, failure theory is expressed in the form of various failure criteria which are valid for specific materials.  Failure criteria are functions in stress or strain space which separate "failed" states from "unfailed" states.  A precise physical definition of a "failed" state is not easily quantified and several working definitions are in use in the engineering community.  Quite often, phenomenological failure criteria of the same form are used to predict brittle failure and ductile yield.