الفهرس 
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Abstract
min.
measured at the extrusion ratio ranging from
o 0
with five sets of semi-cone die angle of 15, 30,
technique is derived for computing the composite flow
presented. The compound method is based on the computing
the extrusion flow stress for both aluminium and copper
individually and applying the Holloway
computing the mean composite extrusion flow stress. The
second is based on the finite element method F.E.M. for
computing the mean composite extrusion flow stress for the
AI/eu duplex tubes directly. The two theoretical solutions
are compared to that obtained experimentally according to
,
Holloway s formula. The resul ts show tha t the three
A computer program ca lIed ELVEX is implemen ted for
computing the nonlinear variations of both aluminium and.