Abstract
This work concerns developing a composite material, which can be used in manufacturing prosthetic feet with a reasonable cost and satisfying mechanical properties. The characteristics were investigated by mechanical tests of tensile properties and Charpy impact strength. The study of date palm wood and its effects on the mechanical properties of polyethylene have received little attention. It was found that Young’s modulus of forty percent high density polyethylene (HDPE) filled with sixty percent of Date Palm Wood (DPW), significantly increased to eighty percent compared with pure HDPE. Moreover, the yield and ultimate stresses were improved, which was approximately two times higher than that observed for pure HDPE; the elongation at break and impact energy were decreased significantly. The characteristics exhibited by prosthetics compared to those of a human foot were investigated further. The analytical section presents the results of the static analysis by numerical methods (Finite Element method FEM), ANSYS Work bench 14 and experimental methods. Thus, the new foot was designed and the dorsiflexion was measured. Overall, the non .articulation of this type of foot is compared against Solid Ankle Cushion Heel (SACH) foot by cost and weight, so that the cost of the non .articulated foot is lower than that of the other by about sixty percent. We also found the new weight is lighter than that of by about two percent. The new model of prosthetic foot has better characteristics, which includes foot life cycle (7.5° and 1,049,135) respectively when compared with the other (6.4° and 896213) respectively.
Highlights
There have been several researchers that have studied prosthetic feet designed and manufactured from polyethylene presented by (Kadhim, 2007)
Such polymers are over ninety percent crystalline, more linear compared with low density type and had a density above 0.95 g/cm3 (Ogah and Afiukwa, 2012)
The purpose of the use of high density polyethylene (HDPE) reinforced with Date Palm Wood powder (DPW) is to get the best mechanical efficiency that when mixing HDPE (40 g) with DPW (60 g) increases the yield of stress from 18 MPa to 45 MPa and ultimate stress from 26 MPa to 50 MPa; an increase of Young's modulus from 1.1 GPa to
Summary
There have been several researchers that have studied prosthetic feet designed and manufactured from polyethylene presented by (Kadhim, 2007). In order to prepare the prosthetic, there should be a mold made of iron, with the dimensions of 20 17.5 cm 5 mm It was made by using ASTM D638 and Surf-cam program and CNC milling machine Model XK 7124 with feed rate 1000 and speed relative to the blend ratio. DPW requires higher speed than HDPE to avoid to Peels or bulge
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