Yahya Bozkurt

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• Professor
• Professor at Marmara University

The increasing popularity of WAAM technology has led the authors to investigate the methods, materials, and parameters used in this new technology. In this study, different WAAM methods are mentioned and studies on this subject are examined according to the used materials. It is aimed to determine the direction of WAAM technology, the parameters th...

Teknolojinin değişmesi ve yapay zekâ teknolojilerinin kullanım alanlarının artması, birçok sektörde yapay zekâ uygulamalarının yaygınlaşmasını sağlamıştır. Bu tür teknolojik gelişmelerin yaygınlaşması yerbilimleri çalışmalarını da olumlu yönde etkilemektedir. Yerbilimleri çalışmaları, bir ülkenin ekonomik, sosyal ve kültürel anlamında güçlü olmasın...

Educational institutions can implement the ISO 45001 management system to ensure a safe and healthy environment for all individuals involved. This article proposes a gap analysis method to identify gaps between the existing and desired health and safety conditions in an educational institution. To test the applicability of the method, data from a s...

Günümüzde savunma, havacılık ve uzay sanayinde, otomobil sanayiinde ve çeşitli endüstriyel alanlarda alüminyum alaşımları imalatı büyük önem kazanmıştır. Üretim aşamasında alüminyum malzemelerin birleştirilmesinde kullanılan ergitmeli kaynak yöntemleri problemli ve zordur. Ayrıca, bu alaşımların birbirine benzemeyen metaller ile birleştirilmesinde...

Genellikle üç boyutlu (3B) baskı olarak adlandırılan eklemeli imalat (Eİ) teknolojisi son yıllarda pek çok alanda kullanılmaktadır. Teknolojinin tanıtılmasıyla, sektörler arası yayılımı artmakta ve tıpta biyofabrikasyon alanının gelişimini hızlandırmaktadır. Eklemeli imalattaki son gelişmeler, hastaya özel sağlık bakım çözümlerinin daha da geliştir...

Additive manufacturing technology is a new technology that is considered to be a technological revolution in the manufacturing industry. It has advantages such as design flexibility, saving material and time, producing low-density and high-strength parts. Due to these advantages it is used in many sectors such as aviation and automotive. The additi...

Additive manufacturing technology is a new technology that is considered to be a technological revolution in the manufacturing industry. It has advantages such as design flexibility, saving material and time, producing low-density and high-strength parts. Due to these advantages it is used in many sectors such as aviation and automotive. The additi...

In this study. 4 mm thick AA5754 Al sheets were used as base material. A wall is formed by applying MIG welding method under a constant single current for AA5356 aluminum alloy wires. Density measurements, microhardness measurements, tensile tests and microstructural examinations of the produced aluminum samples were carried out. As a result of the...

In this study, different AA 5754-H22 and AA 5005-H24 series aluminum alloy sheets were combined with FSW method depending on the tool rotation direction and their mechanical and microstructural properties were investigated.

Inconel 718 alloy is widely used in applications that require advanced strength properties especially at high temperature conditions. Combust room walls, exhaust parts, jet tribune blades and gas tribune equipment are the most known using areas. This alloy can be welded with various fusion welding methods, but TIG (Tungsten Inert Gas) welding is pr...

3D printer technology is one of the innovations brought by the industrial age. It has been in our lives for many years. It is rapidly developing and used in many sectors like aviation and defence industry. This miracle manufacturing method has been frequently preferred for medical applications in recent years. In this study, 3D printer technology i...

Additive manufacturing (AM) technology is a new production method that has been widely used inmany areas in last years. The working principle of the technology is to create layer-based production by addinglayers on top of each other. Unlike traditional production methods based on material extraction, it performsoverlapping layer accumulation. Thus,...

Talaşlı imalat başta olmak üzere metallerin işlenmesi operasyonlarında metal işleme sıvıları ihtiyaç duyulan en temel malzemelerden biridir. Endüstride bilinen ismi bor yağı olmakla beraber kesme yağı, emülsiyon sıvısı, soğutma sıvısı, metal uzaklaştırma sıvısı, metal işleme sıvısı/yağı vb. tabirler ile tanımlanır. Söz konusu akışkanlar çalışan sağ...

Metal dust explosions pose a critical safety threat in industries that produce, use and/or process dusts of various combustible materials. Unfortunately, dust explosions often cause serious injury, death and financial loss. Metal powders exhibit increased explosion severity and sensitivity because of their large heats of combustion, higher combusti...

TIG kaynak yöntemi genellikle paslanmaz çelik ve alüminyum alaşımlarının kaynağında kullanılmaktadır. Düşük ısı girdisi sebebiyle ince sacların kaynağında tercih edilmektedir. TIG torcunun kaynak yapılacak yüzeyden sapmaması, kaynak yapılacak numunelerin stabil olması ve ark kararlılığı kaynak kalitesi için önemli etkenlerdir. Bu nedenle fikstür ku...

Additive manufacturing (AM) technology, in other words “layered manufacturing” or “3D printer technology” has been developing rapidly in recent years. Unlike the traditional manufacturing method (TM), the working principle of AM technology is to create layer-based production by deposition the layers on top of each other. Owing to its advantages suc...

Endüstride üretilen ürünlerin üzerinde çok çeşitli kaynaklı birleştirmeler yapılabilmektedir. Klasik ergitme kaynak yöntemlerinde oluşan sıcaklığa bağlı olarak kaynak bölgesinde gözenek, sıcak çatlak, yüksek ısı girdisi nedeniyle çarpılma ve kimyasal element kaybı gibi problemler meydana gelmektedir. Sürtünme karıştırma nokta kaynağında bu hatalar...

Electrical Resistance Spot Welding (ERSW) are contemporary techniques for joint of the thin sheet materials. ERSW is used a lot of area which are from marine to aerospace industries. In this study, AA2024 sheets are chosen for ERSW joint. Aluminium alloy has a lot of advantages of the other materials. One of them is weight. The samples joints with...

Friction Stir Spot Welding (FSSW) are contemporary techniques for joint of the thin sheet materials. FSSW is used a lot of area which are from marine to aerospace industries. In this study, AA2024 sheets are chosen for FSSW joint. Aluminium alloy has a lot of advantages of the other materials. FSSW is effected with tool rotational speed, tool trans...

Both Friction Stir Spot Welding (FSSW) and Electrical Resistance Spot Welding (ERSW) are contemporary techniques for joint of the thin sheet materials. But FSSW is more modern technique than RSW. FSSW is used a lot of area which are from marine to aerospace industries. Aluminium alloy has a lot of advantages of the other materials. One of them is w...

The purpose of the present work is to study on the effect of material properties tool onfriction stir butt welding of AA2124-T4 alloy matrix MMC. Uncoated tool, coated tool with aCrN, and coated tool with AlTiN were used to weld aluminum MMC plates. Macrostructureand microstructure observations, ultimate tensile strength, wear resistance, and chemi...

Polyurethane (PU) is a synthetic polymer that is used for construction of scaffold in tissue engineering applications in order to obtain desirable mechanical, physical and chemical properties like elasticity and durability. Bovine derived hydroxyapatite (BHAp) is a ceramic based natural polymer that is used as the most preferred implant material in...

In this study, the effect of process parameters on the material position, microstructural and mechanical properties such as, microhardness distribution, ultimate tensile strength and optical microscope of the friction stir welded dissimilar joints was studied. The effects of the material positioning, the tool rotational speed and tool traverse spee...

In this study, the effect of process parameters on the material position, microstructural and mechanical properties such as microhardness distribution, ultimate tensile strength and optical microscope of the friction stir welded dissimilar joints was studied. The effects of the material positioning, the tool rotational speed and tool traverse speed...

Friction stir spot welding (FSSW) has been proposed as an e�ective tech- nology to spot weld the so-called \di�cult to be welded" metal alloys such as thin sheets aluminum alloys and dissimilar materials. FSSW is derived from friction stir welding technology, its principle bene�t being low cost join- ing, lower welding temperature and shorter weldi...

In recent years, the welding of materials of new and complex structure constitutes a problem for the industry. The solid state welding method for joining of these materials were effective. Sheets produced from aluminum and aluminum alloys, especially in areas such as automotive, railway and defense industry have revealed the requirement of the appl...

In recent years, the welding of materials of new and complex structure constitutes a problem for the industry. The solid state welding method for joining of these materials were effective. Sheets produced from aluminum and aluminum alloys, especially in areas such as automotive, railway and defense industry have revealed the requirement of the appl...

This study aims to investigate the effect of aging parameters on wear behaviour of SiCp reinforced AA2124 aluminum metal matrix composite. Aging behaviour and microstructure characterization of AA2124/SiC/25p composite was performed under the aging temperatures of 180, 185 and 190 °C for various dwelling time ranging from 0 up to 100 hours. Wear te...

In the present study, hydroxyapatite used as a matrix material was derived from the femur bones of Meleagris gallapova (MGHA) and then reinforced with yttriyum oxide (Y2O3, 5 and 10 wt.%). Then samples pelleted at 350 MPa were sintered between 900 and 1300 °C. Finally, the effect of Y2O3 reinforcement on the microstructural and mechanical propertie...

In the present study a commercially synthetic hydroxyapatite powders (CSHAp) were doped with lanthanum oxide (5 and 10 wt.% La2O3). The composite powders were well homogenized and pelleted in an uniaxial mould at 350 MPa. Pelleted green bodies were sintered at five different temperatures. Finally, the effect of La2O3 amount on the microstructural a...

The feasibility of friction stir spot welding was studied on AA5754-H22 and AA2024-T3 aluminum alloys which have widespread applications in aircraft and automotive industries. The quality of the joint was evaluated by examining the characteristics of the joint as a result of lap-shear fracture load. Taguchi approach of the parameter design was used...

In this study, the effect of plate positioning on mechanical properties of dissimilar lap joints was investigated by friction stir spot welding (FSSW) process. The determination of the welding parameters plays an important role for the weld strength. For the effective use of the dissimilar aluminum joints, the FSSW must have an adequate strength. T...

In this study, the effect of weld parameters on mechanical properties, such as lap shear fracture load, of friction stir spot welded dissimilar lap joints was studied. The effects of the plate positioning, the plunge depth and the dwell time as well as the tool tilt angle on the joint strength were investigated. The experimental results showed that...

In this study, the effect of weld parameters on mechanical properties, such as lap shear fracture load, of friction stir spot welded dissimilar lap joints was studied. The effects of the plate positioning, the plunge depth and the dwell time as well as the tool tilt angle on the joint strength were investigated. The experimental results showed that...

Friction stir welding (FSW) is a relatively contemporary solid state welding process and has been employed in aerospace, railway, automotive and marine industries for joining of aluminum, magnesium, zinc, titanium, copper alloys, dissimilar metals and thermoplastics. The FSW process parameters such as tool rotation speed, tool traverse speed and ti...

The weld strength of thermoplastics, such as high density polyethylene and polyprophylene sheets are influenced by friction stir welding parameters. The determination of the welding parameters plays an important role for the weld strength. For the influential use of the thermoplastics joints, the weld should have adequate strength. The quality of t...

Metal matrix composites (MMCs) are engineering materials that their increasingly replacing of a number of conventional materials in automotive, aerospace, and sports industries is driven by the demand for lightweight, high specific strength and stiffness. Their wide application as structural materials needs proper development of suited joining proc...

The purpose of the study is to present the feasibility of the joining of similar AA2124/SiC/25p–T4 composite plates by friction stir welding (FSW). Microstructure properties, microhardness, and tensile tests have been performed to evaluate the weld zone characteristics and the performance of AA2124/SiC/25p–T4 composite joints. The phase structure o...

Assemblies consisting of aluminum and particle reinforced aluminum composite alloys have wide spread applications in construction and automotive industries. For a successful use of such dissimilar joints, the welds must have sufficient strength and formability. In the present study, 3003-H24 aluminum alloy and 2124/SiC/25p-T4 composite plates were...

In this study, the presence of metals or compounds which might have been caused by the rotational tool wear tool manufactured from high speed steel in the stirring zone of FSWed similar AA2124/SiCp/25 composite joints has been investigated. The effects of low and high tool transverse speeds (40 and 100 mm min-1) on the tool wear were also evaluated...

The present study is focused on the evaluation of the aging behaviour and microstructure characterization of AA2124/SiC/25p composite under the aging temperatures of 180, 185 and 190 °C for various dwelling time ranging from 0 up to 100 hours. The microstructure was characterized by means of scanning electron microscopy. The hardness, energy disper...

Wear behavior of iron based powder metallurgy (P/M) alloys with boron additions has been studied on a pin-on-disc wear tester using an alloy steel pin and disc of hardness 63 HRC. The P/M alloys in the as sintered as well as different conditions were investigated for their wear behavior. Wear rate was found to initially decrease with increase boron...

Biologically derived hydroxyapatite from calcinated (at 850 degrees C) bovine bones (BHA) was doped with 5 wt% and 10 wt% of SiO(2), MgO, Al(2)O(3) and ZrO(2) (stabilized with 8% Y(2)O(3)). The aim was to improve the sintering ability and the mechanical properties (compression strength and hardness) of the resultant BHA-composites. Cylindrical samp...

Composites of calcinated bovine bone derived hydroxyapatite (BHA) doped 0.5 and 1 wt% CaF2 were prepared by sintering. The production of BHA from natural sources is preferred due to money and time saving reasons. Scanning electron microscopy (SEM) and X-ray diffraction analysis together with measurements of density and compression strength were car...