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====== Double cup extrusion test ======

  * Experimental friction test (Bushhausen /Altan -Ohio State University - 1992).
  * Mean friction coefficient is deduced from the comparison of experimental and numerical (FEM) “cup height ratios”  h1/h2 ( =1 if frictionless).
  * Frictional conditions close to the forging process:
    * Interface pressure ~ 2500MPa.
    * Surface temperature ~600°C.
    * Surface enlargement ~3000%.
  * Typical numerical simulation needs remeshing.
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Comparison with FE results obtained using Deform2D (and remeshing).

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