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Deformation-Mechanism Maps; Creep

  1. Oct 14, 2011 #1

    Astronuc

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    Deformation-Mechanism Maps, The Plasticity and Creep of Metals and Ceramics, by Harold J Frost, Dartmouth College, USA, and Michael F Ashby, Cambridge University, UK.

    Creep is a slow plastic flow of a material, and plastic flow is a kinetic process.

    http://engineering.dartmouth.edu/defmech/

    I'll elaborate later, but others are certainly welcome and encouraged to contribute.
     
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  3. Oct 15, 2011 #2

    Mapes

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    One of my thesis committee members, an outstanding metallurgist, taught me: "There is no such thing as elasticity, only negligible plasticity." Creep occurs in all materials at all temperatures; nothing is immune. Of course, the deformation is generally undetectable at less than a considerable fraction -- perhaps one-third or one-half -- of the absolute melting temperature.
     

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  4. Oct 15, 2011 #3

    Astronuc

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    The text does make such a point - "Although it is often convenient to think of a polycrystalline solid as having a well defined yield strength, below which it does not flow and above which flow is rapid, this is true only at absolute zero."
     
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