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Anisotropy

Leonardo da Vinci, Helsinki Award 2006, Design and execution: Gerold Fink, Austria. Click to open PDF document about this award

Leonardo Da Vinci Helsinki Award 2006

Leonardo da Vinci, Helsinki Award 2006, Design and execution: Gerold Fink, Austria. Click to open PDF document about this award

Bronze medal for an outstanding project promoting and supporting the LifeLong Learning EU policy. Award Berlin 2007

 
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Anisotropy Overview
Anisotropy and earing of beverage cans leading to wastage
Anisotropy in the mechanical properties can cause 'earing' in beverage can bodies. The ears must be cut off, leading to wastage.
Photo courtesy of VAW aluminium AG

The properties of aluminium and its alloys, as with most metals, are never completely uniform in all directions - some degree of anisotropy is always present. The exact nature of this anisotropy depends upon both alloy composition and process history (e.g. casting, rolling, extrusion, annealing, etc). Anisotropic properties can have a major effect on subsequent process stages, especially sheet metal forming processes such as deep drawing and stretch forming, and on in-service performance.

Learning Outcomes for this Section

After completing this section, you should be able to:

  • provide a definition of the term "anisotropy"
  • explain why anisotropy is important, citing examples
  • list some key anisotropic material properties (and others which are isotropic)
  • recall that anisotropy is a material characteristic dependent on composition and processing history (e.g. mechanical and thermal treatments)
  • explain that crystallographic anisotropy is a result of non-random orientation of grains
  • relate the terms "texture" and "preferred orientation"
  • describe, with the aid of diagrams, how preferred orientation data are presented
  • identify some of the most important preferred orientation in aluminium alloys from their "pole figures"

Pre-Requisites

Before starting, it is important that you are familiar with the following terms: % elongation to failure; casting; density; electrical conductivity; extruding; face centred cubic crystal structure of aluminium; heat capacity; Miller index notation for directions and planes in cubic crystals; rolling; tensile stress; thermal conductivity; yield stress; Youngs Modulus;

See Also

External Links

EAA, MATTER and their partners are not responsible for the content of external sites.

References

  • Kocks JF, Tome CN and Wenk HR, "Texture and Anisotropy", Cambridge University Press, 052179420X

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Authors/Contributors