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Article
Studying the Tensile and Buckling for PMMA Reinforced by Jute Fibers for Prosthetic Pylon
دراسة الشد والانبعاج للـ PMMAالمقوى بألياف الجوت للساق الاصطناعي

Authors: Jawad Kadhim Oleiwi --- Shaymaa Jumaah Ahmed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 1 Part (A) Engineering Pages: 111-122
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The main objective of this research is studying the tensile and buckling of Jute fibers reinforced composite by varying the number of Jute fibers layers and fibers angle (±45°&0°/90°). Vacuum bagging technique was adopted for the preparation of laminated composite specimens that made from PMMA as matrix and Perlon layers with different number of Jute fibers layers as reinforcement materials. Also the finite element method (ANSYS-15) was used by creating a model of prosthetic pylon and applied compressive load at heel strike step from gait cycle to know the critical buckling stress. The results showed that the best laminated composite specimens have three Jute fibers layers at (0 º /90 º) fibers orientation relative to applied load. Where, the critical buckling stress, tensile strength, and modulus of elasticity were (442MPa, 61MPa, and 3.75GPa) respectively, while, the percentage elongation was (2.1).

الهدف الرئيسي لهذا البحثهو دراسة الشد والانبعاج لمادة متراكبة مقواهبألياف الجوت بتغيير عدد طبقات الياف الجوت وزاوية الالياف(±45° & 0°/90°). تقنية الحقيبة المفرغة من الهواء هي الطريقة المعتمدة لتحضير عينات المواد المتراكبة الطبائقية المصنوعة من البولي مثيل ميثا اكريليت كمادة اساس وطبقات البرلون وعدد مختلف من طبقات الياف الجوت كمواد تقوية. طريقة العناصر المحددة(ANSYS-15) هي الطريقة المستخدمةلخلق موديل للساق الاصطناعي وتسليط حمل انضغاط عند خطوة ضربة الكعب من دورة المشي لمعرفة اجهاد الانبعاج الحرج. اظهرت النتائج بأن أفضل عينات المواد المتراكبة الطبائقية هي التي تمتلك ثلاث طبقات الياف الجوت باتجاه الياف (0º/90º) نسبة للحمل المسلط. حيث ان جهد الانبعاج الحرج, مقاومة الشد , ومعامل المرونة هي(442MPa, 61MPa , and 3.75GPa) على التوالي, بينما نسبة الاستطالة هي (2.1).


Article
Tensile Properties Distribution of Coir Natural Fiber Using Weibull Statistics

Authors: Ahmed Mudhafar Hashim --- Jawad Kadhim Oleiwi
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 6 Part (A) Engineering Pages: 1080-1087
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In current time, most of the composites based on polymer resins reinforced with natural fibers than synthetic fibers for environmentally friendly consideration. This work investigate the study of tensile properties distribution of coir natural fiber by using Weibull statistics to quantify the degree of variability in fiber strength. Single-fiber tensile and microscopy tests were performed to determination the tensile properties (tensile strength and modulus of elasticity) and fiber crosssectionalarea respectively. The experimental results showed that the coir natural fiber have a good tensile strength and modulus of elasticity of 89.91–237.46 MPa and 2.55-8.78 GPa respectively. The Weibull distribution indicates that the coir natural fiber have a high degree of linearity of R2 = 0.942. The Weibull modulus for corn fibers was β = 3.650 , gives a good variability in tensile strength.


Article
Design of Prosthetic Foot from Polymer Materials Reinforced by Carbon Fibers

Authors: Jawad Kadhim Oleiwi --- Ahmed Namah Hadi
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 9 Part (A) Engineering Pages: 1744-1754
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Loss of the lower limb can cause loss of mobility.At all places and at all times, efforts have always been made to make up for such a loss.In this work polymer composite materialshad been used to manufacture prosthetic foot. Polymer composite materialsPMMA:SR/PURreinforced by carbon fibers (CF) were prepared as suitable material for prosthetic foot then, tensile characteristics were measured and determined. Numerical work included Finite element method (ANSYS-15) was used to analyze and evaluate deformation, stress and strain characteristics of a new designed prosthetic foot, which was treated as three-dimensional structure composite polymer material. The experimental and theoretical results were improvedthat polymer composite material can be used for this application


Article
Tensile and Buckling of Prosthetic Pylon made from Hybrid Composite Materials

Authors: Jawad Kadhim Oleiwi --- Shaymaa Jumaah Ahmed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 14 Part (A) Engineering Pages: 2642-2653
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Compared to traditional prosthetic pylon materials (Aluminum, Titanium, or Stainless steel.), composite prosthetic pylon materials are used instead of metals. Vacuum bagging technique was adopted for the preparation of specimens made of Poly methyl methacrylate (PMMA) as matrix with constant Perlon layers and different number of Hybrid (Carbon + Glass) fibers layers as reinforcement materials at (±45º&0º/90º) orientation relative to applied load. Also the finite element method (ANSYS-15) were used by create a model of prosthetic pylon and applied compressive load at heel strike step from gait cycle to known the critical buckling stress. The experimental and numerical results shown that the tensile strength, modulus of elasticity, and critical buckling stress increases with increasing number of Hybrid fibers layers, that equal to (145 MPa, 6.25 GPa, and 670 MPa) respectively, and the percentage of increase in tensile strength, modulus of elasticity, and critical buckling stress for specimen with three Hybrid (Carbon + Glass) layers and Perlon layers in PMMA resin compared with pure PMMA specimen was (302.7% , 300% & 257.22%) respectively, at (0º/90º) fibers orientation relative to tensile force.

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