Ayad M. Takhakh

Ayad M. Takhakh
Al-Nahrain University · Department of Mechanical Engineering

PhD

About

51
Publications
27,555
Reads
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565
Citations
Introduction
I have taught many subjects (1999–2017) such as: Materials Science, Metallurgy, Manufacturing Processes, Production Engineering, Industrial Engineering, Tool Design, CAD/CAM Systems for undergraduate students. Fracture Mechanics, advanced Engineering Materials, Mechanical Behavior of Materials, Selected Topics in Metal Forming, Advanced Manufacturing Processes, Mold Design for postgraduate students .
Additional affiliations
September 2007 - May 2016
Al-Nahrain University
Position
  • Managing Director
September 2007 - March 2014
Al-Nahrain University
Position
  • Ayad M. Takhakh

Publications

Publications (51)
Conference Paper
Full-text available
The main problem of the prosthetic limb design is the ability to test recently developed devices on amputee and testing in dangerous circumstances. In the present study, a virtual model of trans-femoral prosthesis test platform was designed using SolidWorks® 2018 Software that simulates a dynamic model during the gait cycle. The purpose of this pro...
Conference Paper
The main problem with designing prostheses is the ability to assess newly manufactured devices on patients under unsafe conditions. Some of the issues that obstruct the testing process of the prosthetic limbs on amputees are informed consent, safety straps, and inadequate repetitiveness. This paper introduced a literature study regarding prosthesis...
Article
Full-text available
The improvement of the topological properties in contacts surfaces has been drawn the attention of many commercial firms to reduce energy waste resulting from the influence of friction and wear in combustion engines. These motivations were sufficient for adding nanoparticles upon lubricants to improve their performances. Analysis of nano specimens'...
Article
Full-text available
Modifying buckling behavior of the composite structure has been investigated in the recent few years with different reinforcement fiber and powder materials and nanomaterials. It can be seen from previous studies that the addition of nanomaterials leads to a significant modification in the buckling behavior of structure by using a low mount of nano...
Article
Full-text available
The effect of welding parameters on mechanical properties of aluminum alloy AA 2024-O Friction stir-welded (FSW) joints was investigated in the present study. Taguchi method was used to evaluate the optimum value of process parameters from tensile tests using nine experiments designed according to the matrix proposed by the scientist Taguchi for th...
Article
Friction Stir Processing (FSP) technology was wielded to output the Al7075/ Al2O3 surface composite. The effects parameters of processing method on particle distribution have been studied. The microstructure and mechanical characteristics of the samples were examined using the optical microscope, SEM and hardness examination. Acquired consequences,...
Article
Full-text available
This paper presents a study of the effects of temperature, curing time and silver nano-particles (AgNPs) on the concentration of the PVP/PVA nano composites on shear force of adhesive nano-joining (ANJ). Low temperature (LT) ANJ of copper–copper (Cu–Cu) at the temperature values of 200, 215, 225, 240 and 275°C and curing times of 10, 20 and 30 minu...
Article
Full-text available
in this study, the mechanical, microstructure and corrosion properties of Nickel-Titanium-Copper shape recovery alloys were investigated. The alloy was prepared by the powder metallurgy method, where powders of 50% Titanium, 47 % Nickel and 3% Cupper were mixed and cold compacted at (600,700 and 800) MPa to form cylindrical samples of (11mm diamete...
Article
Full-text available
This paper investigates the effect of heat treatment on the mechanical properties (yield and ultimate strength, elongation, hardness, and modulus of elasticity) and dynamic characteristics (natural frequency and dynamic response) under impulse loading for 6061 and 2024 aluminum alloys in O, T4, and T6 treatment conditions to study the effect of hea...
Article
Full-text available
This study deals with evaluation of smart economic transfemral Prosthetic consist of a new design and manufacturing of knee joint and design and manufacture of a simple electronic circuit that is programmed to control the muscle pressure on the sensor during movement and transfer the voltage of force sensor after processing in microcontroller to th...
Patent
Full-text available
The muscles of the leg are amplified by athletes while exercising. In the case of athletes with limb limbs, this causes irritation and pain in the area of contact with the socket. In order to solve this problem, the subject was studied carefully and the amount of muscle spasm and pressure generated during the different activities of the amputee , T...
Article
Full-text available
In present work, the improving of mechanical properties for welded joint of Al7075-T651 is done using friction stir processing for joint surface by adding SiC particles into surface joint. Strength properties and microhardness of the processing joints has been investigated and compared with welded joint of alloy Al7075-T651. It is recorded that the...
Article
Full-text available
This research study an experimental and optimization work of the effect of moisture on the shear strength of adhesive joints and improvement by adding variable concentration of PVA to PVP. In this work, shear strength samples from Cu-Cu and the adhesive made from dissolving 16 grams of polyvinyl pyrrolidone (k30) and 8 grams of polyvinyle Alcohol i...
Article
Full-text available
A well-designed lower limb prosthesis is necessary in order to permit an amputee to repeat to healthy locomotion. The aim of this study is to enhance the passive prosthesis to a microcontroller-based transfemoral prosthesis which was unable to reach the designated rotational speed intended for a functional use, and had low cost. The enhancement foc...
Article
Full-text available
This work involved experimental study of tensile and fatigue properties for below knee prosthetic sockets materials fabricated using vacuum molding technique. The composite materials are composed of number of carbon-fiber layers (8 layers) and (11 layers) carbon fiber with perlon. The (Ground Reaction Force (GRF), Center of Pressure (COP) and press...
Book
Full-text available
FRICTION STIR PROCESSING (FSP) IS A DEVELOPING NEW, VITALITY PROFICIENT AND GREEN PROCESSING METHOD TO CREATE COMPOSITES SURFACE, WHICH DEPENDS ON THE ADDITIVE AND BASE MATERIALS AND ITS CONTACT MIX BONDING. APPLICATION OF ALUMINUM ALLOYS IN MARINE, AEROSPACE FRAMES, STRUCTURES, TRANSPORTATION, AND EXTREMELY STRESSED PARTS. IN THIS BOOK , COMPOSIT...
Article
Full-text available
This research study an experimental and optimization work of the effect of temperature, curing time and copper concentration on the shear strength of adhesive joints by mixing Polyvinyl Pyrrolidone PVP K30 and polyvinyle alcohol with copper. In this research, shear strength of the adhesive made from dissolving 16 g of Polyvinyl Pyrrolidone PVP (K30...
Article
Full-text available
Knee ankle foot orthoses (KAFOs) are used by paraplegia patients with low level spinal cord injury and having well control of the stem muscles. Four layers of carbon fiber with C- orthocryl lamination resin are used for manufacturing the knee ankle foot orthoses in this work. The mechanical properties of most of the components materials were estima...
Article
Full-text available
Four types of laminated composite materials are tested experimentally in order to estimate the fatigue characteristics and investigation of the mechanical properties for a manufactured symes prosthetic socket. The socket is made of lamination 80:20 matrix reinforced by four types of reinforcement fibers; the first type includes (4perlon, 3carbon fi...
Article
Full-text available
In this work, three types of laminated composite materials used for experimental study to investigate the tensile and fatigue properties of partial foot prosthetic socket which fabricated by using vacuum pressure system. The composite material matrix was Lamination 80:20and reinforced with nine types of laminations (perlon, fiber glass and carbon)....
Article
Full-text available
In this study a Nickel-Titanium-Cupper shape memory alloys was manufactured by powder metallurgy (PM) technique, powder mixture of 50% Ti , 47% Ni and 3% Cu was prepared by mixing for two hours and compacted in a press machine using various compacting pressure (600, 700 and 800) MPa , sample was then sintered for 5 hrs in an electrical tube vacuum...
Article
Full-text available
This study includes two main parts: The first part includes the process of manufacturing and testing partial foot orthosis for a patient suffering from partial foot amputation. The orthosis was manufactured from lamination Perlon-Carbon-Perlon (4-2-4) and then tested with Force plate and F-Socket. The patient was tested in two cases: the first with...
Article
Full-text available
In the present work, composite surface based on AA 7075-T651 matrix reinforced with micro-sized particles of silicon carbide (SiC) has been fabricated by Friction stir processing (FSP). The micorhardness of the processed surface has been investigated and compared with that of base alloy AA 7075-T651. It is found that the friction stir processed sam...
Article
Full-text available
This work covered the experimental program to obtain the mechanical properties of the ankle Foot Ortheses (AFO) composite materials by using tensile, flexural and fatigue tests. They are composed of number of layers (12 layers) perlon with two lyers of carbon-fiber and (10 layers) without carbon fiber. Also, the Ground Reaction Force (GRF), Center...
Article
Full-text available
Friction Stir Welding (FSW) is one of the most effective solid states joining process, FSP is used to modify the microstructure of FSW welded zone. These processes used in many applications that require sheet forming process. In comparison to other welding processes FSW have better formability.The objective of this experiment was to show the effect...
Article
Full-text available
This study focuses on the manufacturing of Nickel-Titanium-Cupper shape memory alloys using powder metallurgy (PM) method, 50% Ti, 47% Ni and 3% Cu powder mixture was prepared by mixing in a ball mill for two hours and compacted in a press machine using various compacting pressure (600, 700 and 800) MPa, samples was then sintered in an electrical t...
Article
Full-text available
Abstact Friction stir processing is a new method of changing the properties of a metal through intense, localized plastic deformation ,this process mixes the material without changing the phase (by melting or otherwise) and creates a micro structure with fine, equiaxedgrains, It is used to improve the micro structural properties of metals. In this...
Data
Full-text available
In this study a Ni-Ti-Cu shape memory alloy was prepared by powder metallurgy (PM) technique, various compacting pressure of (600, 700 and 800) MPa and sintering temperature of (850˚C, 900˚C and 950˚C) were used, Shape Effect (strain recovery), porosity , microhardness ,X-ray diffraction ,energy dispersion x-ray (EDX), scanning electron microscope...
Article
Full-text available
The effect of Cu addition on the physical and mechanical properties of Nickel-Titanium (weight percentage ) shape memory alloy were investigated , density , porosity , compression strength ,Shape Effect (strain recovery), ,micro-hardness , Conducted to estimate the Cu effect ,a Different amount of Cu (2%,5%,10% ) weight percent were added with diff...
Conference Paper
Full-text available
In this study a Ni-Ti-Cu shape memory alloy was prepared by powder metallurgy (PM) technique, various compacting pressure of (600, 700 and 800) MPa and sintering temperature of (850˚C, 900˚C and 950˚C) were used, Shape Effect (strain recovery), porosity , microhardness ,X-ray diffraction ,energy dispersion x-ray (EDX), scanning electron microscope...
Conference Paper
Full-text available
In this work, plastic materials (polypropylene) are used for manufacturing ankle foot orthoses (AFO) with drop foot fabricated using vacuum molding technique. The tensile test results showed that the mechanical properties for polypropylene were, Ϭy= 24.73Mpa Ϭult=35.76 MPa Ϭb max=67.66Mpa and Elongation at Break=38.26mm. The data of gait cycle (Gro...
Conference Paper
Full-text available
Friction stir processing is a may be regarded as new method of changing the properties of a metal through intense, localized plastic deformation ,this process mixes the material without changing the phase (by melting or otherwise) and creates a micro structure with fine, equiaxedgrains, It is used to improve the micro structural properties of metal...
Article
Full-text available
In this work, an investigation has been carried out on Friction stir welding (FSW) and friction stir processing (FSP) of 3mm thick plates of AA5086-H32 aluminium alloy using high carbon high chromium alloy steel tool with a thread tool pin shape. The process variable are welding type (FSW and FSP) and rotational speed which consist of three differe...
Article
Full-text available
Friction stir processing is a new method of changing the properties of a metalthrough intense, localized plastic deformation,this process mixes the material without changing the phase(by meltingor otherwise) and creates a microstructurewith fine, equiaxedgrains, It is used to improve the microstructural properties ofmetals.In this paper , the enhan...
Conference Paper
The effect of Sn addition on the physical and mechanical properties of Cu-13%Al-4%Ni (in weight percentage) shape memory alloy manufactured by powder metallurgy technique,the master alloys and Sn added alloys manufactured by powder metallurgy method in order to improve the alloys properties because this manufacturing process takes near net theoreti...
Article
Full-text available
Friction stir processing is a new method of changing the properties of a metal through intense, localized plastic deformation ,this process mixes the material without changing the phase (by melting or otherwise) and creates a microstructure with fine, equiaxedgrains , It is used to improve the microstructural properties of metals. In this paper , t...
Article
Full-text available
TThis paper deals with calculate stresses in Knee-Ankle-Foot-Orthosis as a result of the effect vibration during gait cycle for patient wearing KAFO .Experimental part included measurement interface pressure between KAFO and leg due to action muscles and body weigh on Orthosis. also measurement acceleration result from motion of defected leg by acc...
Conference Paper
Full-text available
A standard knee-ankle-foot orthosis (KAFO) is typically prescribed to support the limb during locomotion, during which (KAFO) is used for people with isolated quadriceps weakness or paralysis. In this paper the measurement applied on girl undergoing palsy children in her left leg as a case study. The first pathological concern is of age, weight, le...
Conference Paper
Full-text available
Cu-Al-Ni shape memory alloy specimens has been fabricated using powder metallurgy technique with vacuum sintering environment, three rang of Ta powder weight percentage (0.3,0.6,0.9)% has been added. Micro hardness and sliding wear resist has been tested followed by X-ray diffraction, SEM and EDX for micro structure observation. The experimental te...
Article
Full-text available
The effect of welding parameters on mechanical properties of aluminum alloy 3003 H14 Friction stir-welded (FSW) joints were investigated in the present study. Different welded specimens were produced by employing variable rotating speeds (1000, 1250, 1500, 2000 r.p.m.), and welding speeds (20, 40, 60, 80 mm/min). Microhardness measurements and tens...
Article
Full-text available
The aim of the present study is to investigate the influence of thermal variables on the as-cast microstructure of hypoeutectic and eutectic Al–Si alloys and to establish correlation between the solidification thermal parameters and interparticle spacing for Al–12%Si alloy during the unidirectional solidification. New relationships are suggested ba...
Article
Full-text available
AA3003-H14 aluminum alloy plates were welded by friction stir welding and TIG welding. Fatigue properties of the welded joints were evaluated based on the superior tensile properties for FSW at 1500 rpm rotational speed and 80 mm/min welding speed. However, there is not much information available on effect of welding parameters with evolution of fa...
Article
Full-text available
ABSTRACT A friction stir spot welding (FSSW) process is an emerging solid state joining process in which the material that is being welded does not melt. In this investigation an attempt has been made to understand the effect of tool shoulder diameter on the mechanical properties of the joint. For this purpose four welding tools diameter (10, 13,...
Article
Full-text available
Fatigue characteristics of as-cast acicular ductile iron (ASGI) produced by alloying and controlled cooling and as-rolled 42CrMo4 steel were studied. Rotating bending fatigue tests at a stress ratio of R = -1 was employed. Tests included constant stress amplitude loading, variable stress amplitude high-low, low-high loading and coaxing. S - N curve...
Article
Full-text available
Experimental and numerical study has been achieved on a hypoeutectic Al-Si alloy under the effect of directional solidification in ceramic mold chilled with copper. From the coupling between experimental (microstructure evaluation) and numerical (solidification simulation) study, a model is obtained. This model can be used to predict the microstruc...
Article
This research work studied the fatigue behavior of as-cast acicular ductile iron produced by addition of Ni and Mo in conjunction with controlled cooling. Rotating bending fatigue-testing method of cantilever type at a stress ratio of R = -1 was employed. Crack growth rates da/dN were determined and plotted vs. crack length. It was shown that da/dN...

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Projects

Projects (7)
Project
Manufacturing and Analysis of Ankle Foot Orthoses