Engineering and Technology Journal (Mar 2009)
Effects of Lamination Layers on the Mechanical Properties for Above Knee Prosthetic Socket
Abstract
In order to initiate a database on materials properties of typical laminationused in above knee prosthetic limb socket fourteen group of different laminationmaterials layers are manufactured using perlon and fiber glass and acrylic resin.The effect of increasing and decreasing of perlon and fiber glass layers onmechanical and physical properties are examined subjected the eighty twomanufacturing sample of the different fourteen group of lamination to tensile andflexural test .Results show that the lamination which was layup from three layers of perlon plustwo layers of fiber glass plus three layers of perlon gives the optimum mechanicalproperties . Comparing this lamination with the standard lamination used inBaghdad center of five layers of perlon plus two layers of fiber glass plus fivelayers of perlon it can be seen that ,in spite of the big reduction in perlon layersform ten to six layers the yield stress increased with 14.75% while ultimatestrength remains at the same value and bending stress decreased with 1.3% only . Itis recommend to use this type of lamination for the layup the above knee socketbecause it meets the requirement of good socket design for acceptable mechanicalproperties 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 layerswith 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 resultsshow that the lamination group of sandwich lay up during which the layers ofperlon distributed equally (homogeneously) on each side of the central fiber glasslayers 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 comparedwith the others group of unequally distributed lamination .
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