Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Micromechanical Model of Hardening, Rate Sensitivity and Thermal
  Softening in BCC Single Crystals   The present paper is concerned with the development of a micromechanical
model of the hardening, rate-sensitivity and thermal softening of bcc crystals.
In formulating the model we specifically consider the following unit processes:
double-kink formation and thermally activated motion of kinks; the close-range
interactions between primary and forest dislocations, leading to the formation
of jogs; the percolation motion of dislocations through a random array of
forest dislocations introducing short-range obstacles of different strengths;
dislocation multiplication due to breeding by double cross-slip; and
dislocation pair annihilation. The model is found to capture salient features
of the behavior of Ta crystals such as: the dependence of the initial yield
point on temperature and strain rate; the presence of a marked stage I of easy
glide, specially at low temperatures and high strain rates; the sharp onset of
stage II hardening and its tendency to shift towards lower strains, and
eventually disappear, as the temperature increases or the strain rate
decreases; the parabolic stage II hardening at low strain rates or high
temperatures; the stage II softening at high strain rates or low temperatures;
the trend towards saturation at high strains; the temperature and strain-rate
dependence of the saturation stress; and the orientation dependence of the
hardening rate.

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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol