Effects of lamination layers on the mechanical properties for above knee prosthetic socket

Abstract EN

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 (σy,σult, E, σ flex, Eflex) 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 (σy,σult, E, σ flex, E flex) 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 .