Search Results

You are looking at 1 - 6 of 6 items for

  • Author or Editor: Muhammad Safa Al-Din Tahir x
  • Refine by Access: All Content x
Clear All Modify Search
Pollack Periodica
Authors:
Muhammad Safa Al-Din Tahir
,
Shakir Sakran Hassan
, and
Jumaa Salman Chiad

Abstract

The commercially available and research-developed positive-type ankle joints do not provide eversion and inversion movements and are limited to dorsiflexion and plantar-flexion. The aim of the research is to create an ankle joint that is simple to install, low in cost and closes in performance to the biological joint. The passive ankle joint is designed to perform dorsiflexion, plantar-flexion, eversion, and inversion movements. A biomechanical test was performed to find the similarity between the functions of the engineered ankle joint and the biological ankle joint. The conclusions show, the designed ankle joint on the simplicity of its structure and components, has come close to the biological function of the ankle in terms of angles.

Restricted access
Pollack Periodica
Authors:
Fahad Mohanad Kadhim
,
Muhammad Safa Al-Din Tahir
, and
Athmar Thamer Naiyf

Abstract

This study aims to increase the mechanical properties of the composite material manufactured by the lamination process. In this study, the lamination process will be implemented in two ways, and mechanical properties are compared between the two methods. The first method covers the lamination process under the influence of vacuum pressure only, while in the second method lamination process is achieved by the influence of vacuum pressure and vibrate by shaker device. The results showed that the endurance stress of fatigue increased by 18.18% for the material manufactured by the lamination process under the influence of vibration, while the yield stress and ultimate stress values remained roughly constant for both methods.

Restricted access
Pollack Periodica
Authors:
Muhammad Safa Al-Din Tahir
,
Shakir Sakran Hassan
, and
Jumaa Salman Chiad

Abstract

One form of energy storage in spring is applying a bending moment and converting it into tilt at the head of the spring as strain energy. The relationship between them is the lateral stiffness of the spring. The aim is to find a mathematical equation for the lateral stiffness of the spring and the effect of the length of the spring on the behavior of stiffness.

The mathematical model is created according to Castigliano’s second theorem. A simulated model of a conical spring is built using a Solid Work program. The theoretical results are compared with the mathematical model for the same conical spring.

Results of both theoretical and simulated models evinced a linear behavior of lateral, while an exponential relationship between the length of the spring and the lateral stiffness is indicated. The difference between theoretical and simulated models is not exceeded 3.2%, which indicates the acceptability of results.

Restricted access
International Review of Applied Sciences and Engineering
Authors:
Fahad Mohanad Kadhim
,
Muhsin Jaber Jweeg
,
Rowaid Nabeel Yousuf Al-Kkow
, and
Muhammad Safa Al-Din Tahir

Abstract

The pylon is an essential part of lower limb prosthetics. It is usually made of titanium, aluminum, and steel. However, it is expensive and difficult to be available in developing countries, especially for children who suffer from amputation. Moreover, they constantly need new pylon pieces during close periods due to the growth and increase in the child's length.

Purpose

This study aims to design an adjustable pylon that can change in length to suit the increase in the length of the healthy leg of the child without the need for a new pylon and reduce the economic cost.

Design/methodology/approach

In this study, an adjustable pylon model was designed using the CAD software (Solid work) and work to manufacture the pylon from low-cost materials (carbon fiber filament) capable of bearing the amputee's weight, and manufacturing printed parts by using additive manufacturing technical (CREALITY CR20 3D printer).

Findings

The results showed that the pylon is successful in design and strength as it bears the patient's weight without any failure or buckling, and the proof that the maximum amount of stress generated is 27.8 MPa, which is far from the value of the yield stress.

Originality/value

The design of the adjustable pylon prototype offers good strength and ability to bear the patient weight, reducing the cost and time of manufacturing.

Open access
Pollack Periodica
Authors:
Athmar Thamer Naiyf
,
Fahad Mohanad Kadhim
,
Samah Falah Hasan
, and
Muhammad Safa Al-Din Tahir

Abstract

The aim of this study is to design a pylon with an engineering structure that gives it support and strength and manufacture a pylon characterized by low cost, lightweight, and bearing the patient's weight. This study designed two pylon models and fabricated by additive manufacturing techniques. The polylactic acid polymer is used as the filament for the 3D printing of pylons. A force plate and tensile test with finite element method simulation ANSYS software were applied to the pylons to evaluate their performance. The results showed that 3D printed pylon with Y-section has enough strength under stress and good safety factor, and the ability to bear a high patient load without buckling and exceed the requirements to become instead of the metallic prosthetic pylons.

Restricted access
Pollack Periodica
Authors:
Fahad Mohanad Kadhim
,
Emad Zuhair Gheni
,
Athmar Thamer Naiyf
, and
Muhammad Safa Al-Din Tahir

Abstract

The objective of this study is to simulate material selection for fabricating hip joint prostheses from light-weight, low-cost materials which are also strong and durable. In this study, Co-Cr alloy CoCrWNi (F90), stainless steel ASIS 410, and titanium alloys (Ti6Al4V) material selection as the potential candidate for the suggested implant to manufacture a joint that is characterized by lightweight, low cost, does not react chemically with the human body and can bear the weight of the patient without mechanical failure. With this study, it was concluded the stainless steel ASIS 410 was selected as the best material selection since it passed engineering analysis, acceptable weight, and low cost compared to other proposed materials.

Restricted access