Acta Mechanica Solida Sinica

, Volume 21, Issue 4, pp 333–336 | Cite as

Magnetic Strips to Simulate Layered Brittle Solids in Cleavage and Fracture Experiments

  • Francisco G. Emmerich
  • Alfredo G. Cunha
  • Carlos M. A. Girelli
  • Arnobio I. Vassem


A characteristic of the fracture and cleavage experiments is that they are usually intrinsically destructive. Cracks do not completely heal in an unstressed system, even in crystals such as mica. Here, we used magnetic solids composed of magnetic strips for the non-destructive cleavage and brittle fracture experiments. Between the magnetic strips materials with different mechanical characteristics can be inserted, such as Teflon or foam strips, to change the mechanical properties of the solid. For the cleavage experiments, we developed an apparatus where parameters such as the main involved force can be measured easily. By inserting flaws, the magnetic solid can be used in dynamic fracture experiments, with the advantages of simulating macroscopically a non-destructive experiment in an easier way, that happen in real materials with much higher velocities. The apparatus and the used magnetic solid may be useful for demonstrations of fractures in classes.

Key Words

layered brittle solids non-destructive measurements cleavage fracture 


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  1. [1]
    Virdi, K.S., Non-destructive ultrasonic testing of structures to measure stress. UK Patent Application, GB 2 165 050 A, 1980.Google Scholar
  2. [2]
    Hutchinson, I.N. and Langman, R.A., Non-destructive determination of stress characteristics in magnetic materials. PCT/AU88/00293, WO 89/01613, 1989.Google Scholar
  3. [3]
    Lawn, B.R., Fracture of Brittle Solids, 2nd ed. Cambridge: Cambridge University Press, 1993.CrossRefGoogle Scholar
  4. [4]
    Fineberg, J., Materials science: close-up on cracks. Nature, 2003, 426: 131–132.CrossRefGoogle Scholar
  5. [5]
    Buehler, M.J., Abraham, F.F. and Gao, H., Hyperelasticity governs dynamic fracture at a critical length scale. Nature, 2003, 426: 141–146.CrossRefGoogle Scholar
  6. [6]
    Marder, M., Effects of atoms on brittle fracture. International Journal of Fracture, 2004, 130: 517–555.CrossRefGoogle Scholar
  7. [7]
    Emmerich, F.G., Direct experimental observation of a general pattern at the beginning of brittle fracture. Applied Physics Letters, 2005, 87: 131903.CrossRefGoogle Scholar
  8. [8]
    Emmerich, F.G., Tensile strength and fracture toughness of brittle materials. Journal of Applied Physics, 2007, 102: 073504.CrossRefGoogle Scholar
  9. [9]
    Emmerich, F.G., Apparatus for non-destructive experiments of brittle fracture and experimental simulation of earthquakes. Brazilian Patent Application, No.PI 0304992-2, 2003.Google Scholar
  10. [10]
    Obreimoff, J.W., The splitting of mica. Proceeding of the Royal Society of London, 1930, A127: 290–297.CrossRefGoogle Scholar
  11. [11]
    Emmerich, F.G., Atomistic interpretation of the Obreimoff’s experiment. Eighth International Conference on the Fundamentals of Fracture — ICFF VIII, Hong Kong & Guangzhou, China, 2008.Google Scholar
  12. [12]
    Kelly, A. and Macmillan, N.H., Strong Solids, 3rd ed. Oxford: Clarendon Press, 1986.Google Scholar
  13. [13]
    Ravi-Chandar, K., Dynamic fracture of nominally brittle materials. International Journal of Fracture, 1998, 90: 83–102.CrossRefGoogle Scholar
  14. [14]
    Emmerich, F.G., Cunha, A.G., Girelli, C.M.A. and Vassem, A.I., Apparatus with magnetic strips for non-destructive experimental simulation of cleavage and brittle fracture. Brazilian Patent Application, PI0800335-1, submitted to INPI, Brazil on 03 Jan 2008.Google Scholar

Copyright information

© The Chinese Society of Theoretical and Applied Mechanics and Technology 2008

Authors and Affiliations

  • Francisco G. Emmerich
    • 1
  • Alfredo G. Cunha
    • 1
  • Carlos M. A. Girelli
    • 1
  • Arnobio I. Vassem
    • 1
  1. 1.Laboratory of Carbon and Ceramic Materials, Department of PhysicsUniversidade Federal do Espirito SantoVitoriaBrazil

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