Understanding Crystal Dislocations: A Mathematical Approach

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Discussion Overview

The discussion revolves around the mathematical treatment of dislocations in crystal structures, particularly focusing on Burgers' vectors and the strain response to applied stress. Participants seek references and resources that provide a detailed theoretical framework, emphasizing mathematical formalism and tensor analysis.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant expresses a need for references that treat dislocation theory with a mathematical emphasis, specifically mentioning tensors and Burgers' vectors.
  • Another participant suggests several texts on dislocations, indicating that older versions may suffice, and questions whether the original poster is looking for something more advanced.
  • A participant mentions finding a free manuscript by Prof Sir Bhadesia, noting that it contains useful information but has some unusual notation.
  • One participant warns that the high number density of dislocations complicates the formalism in the field, suggesting that this may lead to disappointment in finding a purely formal treatment.
  • A reference to a paper by Hirth discussing the historical context and mathematical connections in dislocation theory is provided, highlighting various contributions and concepts related to dislocation density and continuum mechanics.
  • Another participant mentions discovering a section on dislocations in Landau/Lifshitz's work on elasticity theory, expressing excitement about this find.
  • Links to additional resources, including conference proceedings and classic texts on dislocation theory, are shared by participants, indicating a variety of sources available for further exploration.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a single reference or approach, and multiple competing views and resources are presented throughout the discussion.

Contextual Notes

Some participants note the limitations in finding formal treatments due to the complexity and high density of dislocations, which may affect the availability of comprehensive mathematical resources.

etotheipi
I'm in not too urgent (but a little pressing, i.e. I have an assignment on this due Friday... 😣 ) need of some reference that treats the theory of dislocations in crystal with a mathematical emphasis (i.e. tensors); specifically, pertaining to Burgers' vectors and the strain response to applied stress in crystals containing dislocations. Does such a reference exist?

The lecturer recommended Callister but it's general purpose and doesn't go into enough detail on this section.

Thanks!
 
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Or even an internet reference, to be honest. I don't think I'd consider buying a book unless I could use it for other stuff too.

A few minutes ago I did find a free manuscript by Prof Sir Bhadesia
https://www.phase-trans.msm.cam.ac.uk/2001/crystal.html

think that's got a few bits in it but a little strange notation (Mackenzie & Bowles?). Maybe, worth a shot.
 
Your going to be disappointed. The problem is that the number density of dislocations is high and that mechanisms abound. So the focus has not been on formalism.
 
This paper
Hirth, J.P. A brief history of dislocation theory. Metall Mater Trans A 16, 2085–2090 (1985). https://doi.org/10.1007/BF02670413

has this paragraph

Brown,52while considering magnetic properties of dis- locations, originated the concept of smearing discrete dislocations into a continuous array of infinitesimal dis- locations. This method has resulted in connections with powerful methods of mathematics but describes properties of the net dislocation density and has some problems in uniqueness and the description of arrays of dislocations of opposite sign. In early work, Nye53described the connec- tion between the net dislocation density tensor and the lat- tice curvature. Kondo54and Bilby, Bullough, and Smith55 showed that the Cartan torsion of space is the continuum equivalent of the dislocation, with the Cartan circuit closely related to the Burgers circuit.56The latter authors used the continuum description to derive the geometric properties of grain boundaries. Kr/Sners7 developed the concept of the incompatibility, proportional to derivatives of the dislocation density, and descriptions of the elastic fields in terms of it. Further advances are discussed in several reviews. 57.58,59

and refs 52-59
52. W.E Brown: Phys. Rev., 1941, vol. 60, p. 139.
53. J. E Nye: Acta MetaU., 1953, vol. 1, p. 153.
54. K. Kondo: RAAG Memoirs of the Unifying Study of the Basic Prob-
lems in Engineering Sciences by Means of Geometry, Gakujutsu Buuken Fukyu-Kai, Tokyo, 1955, vol. I, p. 453; also see Ref. 46, p. 761.
55. B.A. Bilby, R. Bullough, and E. Smith: Proc. Roy. Soc. London, 1955, vol. A231, p. 263.
56. E. KriJner: in Dislocation Modeling of Physical Systems, M.F. Ashby, R. Bullough, C. S. Hartley, and J. P. Hirth, eds., Pergamon, Oxford, 1981, p. 285.
57. E. Kr/Sner: Ergeb. angew. Math, 1958, vol. 5, p. 1.
58. E. Cosserat and F. Cosserat: Theorie des Corps Deformables,
Herman, Pads, 1909.
59. Mechanics of Generalized Media, E. KriSner, ed., Springer, Berlin,
1968.
 
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thanks, I'll take a look and see which of those I can access! should be some useful stuff in there.

was also going to say that I discovered that Landau/Lifshitz wrote a little section on dislocations near the end of vol. 7 on elasticity theory... think I hit the jackpot, there 😍
 
FUNDAMENTAL ASPECTS OF DISLOCATION THEORY, Conference Proceedings, April 1969
https://www.govinfo.gov/content/pkg...VPUB-C13-3e85db87f8d45249963643f05e447bd7.pdf

A classic text - Elementary Dislocation Theory
Johannes Weertman and Julia R. Weertman, Published: 25 June 1992
https://global.oup.com/academic/product/elementary-dislocation-theory-9780195069006?cc=us&lang=en&#

J. Weertman, Theory of Steady‐State Creep Based on Dislocation Climb Journal of Applied Physics 26, 1213 (1955); https://doi.org/10.1063/1.1721875 - see the references of folks like Sherby, Dorn and Mott
https://aip.scitation.org/doi/pdf/10.1063/1.1721875
 
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