Authors
Abstract
In order to initiate a database on materials properties of typical lamination
used in above knee prosthetic limb socket fourteen group of different lamination
materials layers are manufactured using perlon and fiber glass and acrylic resin
.The effect of increasing and decreasing of perlon and fiber glass layers on
mechanical and physical properties are examined subjected the eighty two
manufacturing sample of the different fourteen group of lamination to tensile and
flexural test .
Results show that the lamination which was layup from three layers of perlon plus
two layers of fiber glass plus three layers of perlon gives the optimum mechanical
properties . Comparing this lamination with the standard lamination used in
Baghdad center of five layers of perlon plus two layers of fiber glass plus five
layers of perlon it can be seen that ,in spite of the big reduction in perlon layers
form ten to six layers the yield stress increased with 14.75% while ultimate
strength remains at the same value and bending stress decreased with 1.3% only . It
is recommend to use this type of lamination for the layup the above knee socket
because it meets the requirement of good socket design for acceptable mechanical
properties and its minimizing the cost of socket lamination to suitable cost value.
Also it was found that increasing the fiber glass layers from zero to two layers
with fixing perlon layers leaded to increased in( E y ult s ,s , , flex flex s ,E ) with
(40%,30.4%,110.5% 36.4%and 20.4%) respectively. At the same time the results
show that the lamination group of sandwich lay up during which the layers of
perlon distributed equally (homogeneously) on each side of the central fiber glass
layers improved the mechanical properties set ( E y ult s ,s , , flex flex s ,E ) with ((21-
59)%,(12.4-66.4)%,(46.6-150)%,(5.2-60.2)%,(27.5-44.8)%) respectively compared
with the others group of unequally distributed lamination .
Keywords
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