Necdet Geren

Cukurova University | CU · Department of Mechanical Engineering

Buluş, elektrikli taşıtlarda kullanılan pil hücrelerinin/paketinin termal yönetimi ve batarya kutusunun herhangi bir mekanik hasarı durumunda kendini iyileştirme (tamir etme) özellikli çeşitli çaplarda kendinden kanallar barındıran elyaf takviyeli polimer kompozit batarya muhafaza kutusuyla ilgilidir.

The current study aims to optimize the thermal management system of the composite battery case, which is planned to protect and improve the battery's safety and life cycle. The relatively heavier and more complex structure of liquid-cooled thermal management systems will be compensated by a composite battery case produced with a new patent-protecte...

PVC foam materials are preferred in many engineering applications because of their lightweight nature and strength/weight ratio. They are mainly used as the core material in the middle of sandwich panels with improved flexural rigidity. The mechanical performances of sandwich panels, such as flexural load-deflection, core shear load, core shear fai...

Following an extensive research and development phase, in a funded project conducted over the past few years, personalized scalp cooling caps are developed with generative design tools using cranial data collected from healthcare professionals to provide an optimally fitting wearable cryotherapy device utilizing CAD packages and design tools.Recent...

Due to concentrated bending loads, indentation is a common failure mode for sandwich structures. Indentation restricts the efficient use of sandwiches and is seriously affected by the sandwich design. Currently-used Traditional Analytical Models (TAM) are insufficient to predict the indentation load of the sandwiches with fiber-reinforced polymer (...

This work investigates the impact of tempering temperature on the mechanical properties quenched 1.2842 (O2) cold work tool steel depending on the volume fraction of retained austenite (RA). The tempering temperature significantly influences proportion of RA and the mechanical properties. Therefore, the tempering temperature and the volume fraction...

Composites have been widely used lately because of their high specific stiffness and strength characteristics. In this study, the impact resistance of sandwich structures with carbon fiber-reinforced polymer (CFRP) face sheet and polyvinyl chloride (PVC) foam core material, which is frequently used in areas requiring high specific stiffness, such a...

The difficulties in establishing an analytical model for plain woven fabric composites (PWFC) and its implementation are well-accepted due to the complexity of yarn architecture, approximations assumed, and lack of experimental validations. In this paper, a practical engineering approach is proposed to predict the tensile properties of PWFC. The ap...

Untransformed austenite during quenching process is known as retained austeinite. The quantitative determination of the retained austenite is of great importance to the steel mechanical properties. Its percentage has a large effect on the mechanical properties and service life of components. The amount of retained austenite in through-hardened tool...

In this study, the effects of different manufacturing methods on the physical and mechanical properties of carbon/epoxy composite laminates were investigated. The hand lay-up, compression moulding, and vacuum bagging methods with two different vacuum characteristics were selected as the applied methods. The fibre volume fraction (Vf), density, and...

Ball joints used in the steering systems of vehicles are exposed to fluctuating loads, which can cause fatal accidents in case of failure. The design of ball joints is an iterative and time-consuming process. Even though the automotive industry is preparing for the era of autonomous self-steering vehicles, parts such as ball joints were not designe...

Analytical predictions of woven plain fabric composite (WPFC) mechanical properties based on the existing models still remain a formidable task due to complex fiber architecture. Therefore, there has been a strong need for a simplified, practical approach to determining the mechanical properties of structural members laminated with WPFC. This paper...

In this study, a generative method was introduced to determine the optimal design of low-density polymer foam core sandwiches using finite element analysis (FEA) and multi-objective optimization of design variables without needing experiments. The method was also assessed. The sandwich structures were designed based on woven plain carbon fiber fabr...

Euro-6 norms for reduction of CO2 emissions and ECE-R66-01 regulation for safer passenger transportation became legislative obligations for bus builders. These two adaptations increase the weight of a bus as nearly 600kg which also increases the fuel consumption nearly 1.5-3%. Dual phase (DP) steels can compensate these increases by decreasing the...

The necessity to increase the structural efficiency unceasingly continues based on the technological developments in the materials universe. In this respect, the sandwich materials have emerged as structural members in many engineering fields to increase stiffness with reduced weight. However, while the sandwiches constructed by the lightweight and...

It is well accepted that many mechanical engineering (ME) design processes are complex. We believe that many ME design approaches include unnecessary complexity, intended to assist the teaching of engineering knowledge. This technical complexity has contributed to many critical issues in ME education, including decreased enrolments in many countrie...

The objective of the present experimental work is to investigate the influence of subsurface roughness on the friction and wear performance of high-temperature ball bearing. Bearings, which are used in high-temperature applications, are affected by several operating conditions. Some factors under high-temperature conditions such as short grease lif...

Sandwich structures with carbon fiber‐epoxy face sheets and polyvinyl chloride foam core material are known for their high strength and flexural stiffness despite their low weight. However, the structural response, in terms of crush strength, of the particles added sandwich structures are not very well known under impact loading conditions. In this...

z Son yıllarda elektrikli araçlar, insansız hava araçları, haberleşme uydusu gibi uzay ve havacılık sistemlerinin millî kaynaklar ile geliştirilme çalışmaları artmıştır. Bu nedenle de savunma sanayi ürünlerinin imalat teknolojilerine giderek artan ölçüde ihtiyaç duyulmaktadır. Baskı devre kartı (BDK) tamirini sağlayan tekrar üretim (remanufacturing...

Developments for improving the effectiveness of the composite structures strongly depend on the manufacturing methods. Additionally, the composite manufacturers have put effort into cost-effective and automated fabrication with mechanization. Controlling of the imperfections is also an important consideration for the production. This study presents...

Developments for improving the effectiveness of the composite structures strongly depend on the manufacturing methods. Additionally, the composite manufacturers have put effort into cost-effective and automated fabrication with mechanization. Controlling the imperfections is also an important consideration for the production. This study presents se...

In recent years, there has been an increasing amount of efforts to develop space and aviation systems such as electric vehicles, unmanned aerial vehicles, communication satellites through national resources in Turkey. Therefore, an increasing need for manufacturing technologies of defence products has emerged. Printed circuit board assembly (PCBA)...

Elyaf takviyeli polimer kompozit yapılar, hafifliğin yanı sıra yüksek mukavemete sahip olup nem, korozyon gibi çevresel etmenlere karşı direnç gösterirler ancak ani darbe yüklerine karşı zayıf ve kırılgandır. Bu yüzden araştırmacılar özellikle uzay-havacılık ve savunma sanayi alanları için elyaf ve metal malzemeleri bir arada lamine ederek FML (Fib...

In this study, low-density polymer foam core sandwich beams, non-existent in the literature, having woven carbon/epoxy face sheets in different core thicknesses and specimen lengths were fabricated and then subjected to three-point bending tests. The bending behavior of the sandwich beams were scrutinized experimentally. The effects of both core th...

In this study, flexural characteristics of low-density polyvinylchloride foam core sandwich structures consist of carbon fibre/epoxy facings hybridised with very thin stainless-steel wire mesh sheets were investigated. A comprehensive work was conducted considering the following design parameters: core thicknesses, wire mesh sizes, stacking sequenc...

In this study, AISI 1050 steel was boronized at temperatures of 800, 850, 900, 950 and 1000 °C for 3, 6, and 9 hours by means of a pack boronizing process. The formation of the boride layer was investigated. The characterization of the boronized surfaces was determined by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM). Alth...

Hybridization plays an important role to achieve multi-functionality for the particular composite applications. Hybrid composites allow designers to obtain desired physical and mechanical properties that cannot be provided from a single type of fiber reinforcement such as combining high strength, light weight and good impact resistance together. In...

Sandwich structures offer innovative alternative solutions to many weight-critical industrial fields due to their lightweight and very high flexural rigidity compared to conventional materials. A vast number of sandwich configurations can be produced from a variety of materials for use as face sheets and core as well as matrix. Although there are m...

Sandwich structures offer innovative alternative solutions to many weight-critical industrial fields due to their lightweight and very high flexural rigidity compared to conventional materials. A vast number of sandwich configurations can be produced from a variety of materials for use as face sheets and core as well as a matrix. Although there are...

Students with relatively low affinity and/or weak ability for science and mathematics have been presently acknowledged into Mechanical Engineering (ME) departments around the world. This has resulted in apparent lowering of fully competent graduate engineers, due to insufficient comprehension and its concomitant cognitive issues. Now, the complexit...

ZET Bu çalışmada açık kaynak ergiyik biriktirmeli 3 boyutlu (3B) yazıcı kullanılarak, düşük sıcaklıkta eriyebilen metal alaşımın yazılması için ekstrüzyon sıcaklığı, yazma hızı, besleme oranı ve nozül malzemesi gibi proses parametrelerinin etkisi incelenmiştir. Çalışma öncelikle baskı esnasında düzgün çizgi yapısı elde etmeye odaklanmaktadır. Daha...

In automotive applications, using the commonly existing wheel hub models are not an effective way especially for the specific efficiency challenge races. Because, the primary aim is to design the part as light as possible considering a proper material selection and structural size without any reduction in the strength. But the commercial Original E...

ISO and AGMA standards provide the most accurate and commonly used spur gear design approaches but the design results obtained from both are differing from each other even under the same input parameters. The selected design approach has a significant influence on the results, therefore, if the design approaches are not rated for gear designs, the...

This study aims to select optimum materials for particular spur gear designs. An advanced material selection technique called Ashby’s method was used to determine suitable materials according to their material index. The method requires objective function, constraint and free variables. Objective function was set to minimizing mass based on the b...

Fiber metal laminate (FML) is an advanced composite material that combines the advantageous of both fiber reinforced composites and metal alloys without sharing their individual disadvantages. When it is compared to commonly known fiber reinforced polymer composites, the FML provides better impact resistance and fatigue strength. But the production...

Ball joints used in steering system of vehicles have hundreds of different types and configurations. The use of traditional design methods causes loss of time and increases design cost. In this study, a new platform called as ‘‘parametric design platform’’ has been developed for the parametric design of a ball joint using three dimensional (3D) mod...

The design approaches are not rated for gear tooth volume, the designers are not aware of the loss or gain on the cost, and failure or success of the design. This study provides a novel method to rate and convert textbook gear design approaches into ANSI/AGMA standard. The steel pinions with lowest and highest strengths covering minimum and maximum...

Morphological design is one of the most effective methods used in concept development phase of design. At the end of the process, the best design is achieved. The morphological design method brings with it an important problem besides its advantages brought to the designers. The most important problem is the high number of solutions. The solutions...

Bu bölümün amacı Makina Mühendisliği öğretimi ve mesleğini tüm yönleriyle makina mühendisliği öğrencilerine tanıtmak ve çeşitli konularda farkındalıklar oluşturmaktır. Örneğin çalışma koşulları ve ücret politikası koşullarının her ikisinin de arzu edilen düzeyde olduğu bir iş bulmak meslek yaşamı için çok önemlidir. Buna karşın öğretim sürecinde bu...

Bu bölümde ağırlıklı olarak makine elemanlarının seçimine yardımcı olacak temel özellikleri ön plana çıkarılmaktadır. Makine elemanlarının tasarımları için gereken eşitliklere ise kısıtlı şekilde yer verilmektedir çünkü bu kitabın amacı “Makina Mühendisliği” kapsamına giren konulara giriş yapmak ve makina mühendisliği öğrencilerine ve makine mühend...

Bu kitabın amacı, “Makina Mühendisliği” kapsamına giren konuları bir araya getirmek ve Makina Mühendisliği Bölümü öğrencilerine, öğretim yaşamı boyunca verilen dersler hakkında temel bilgileri önceden kazandırmak ve mezuniyet sonrası da bir başvuru kaynağı olmasını sağlamaktır. Bu kitap, Makina Mühendisliğinin temel alt yapısını oluşturan tüm konul...

Abstract. Sandwich structures which are categorized under the hybrid materials, provide to obtain very light-weigth and very high resistance to bending when compared to commonly used laminated composite materials. These structures are now called as advanced composite materials and newly used in automotive, aviation, marine and defense industries. I...

Fiber reinforced polymer (FRP) composites have significant potential for applications in many engineering fields in place of metallic materials, due to their low density, high strength to weight ratio, high stiffness, better corrosion resistance and durability. The fabrication of these composites requires careful design and appropriate process deve...

Composite materials have light weight, high strength and are resistant to environmental factors such as corrosion and humidity but weak and crushing against impact loads. Therefore, researchers have developed fiber and metal laminated (FML) composite materials. FML composites bring out the advantages of fibers and metals while eliminating their dis...

In this study, the manufacturing of sandwich structures was carried out by using ±45o glass fiber fabric plies for facing and polymer foam core materials having very low density. The commonly used production method that is hand lay-up and vacuum bagging was preferred with epoxy resin. Two different types of Polyvinyl Chloride (PVC) foam core materi...

ISO and AGMA Standards are the most commonly used accurate approaches while designing a gear. But the most important gear design outputs that are module (m) and face width (b) are obtained from both of the approaches always differ from each other even under the same input parameters. Therefore, gear designers require detailed knowledge on the relat...

Selected design approach has a significant influence on the results of a particular design. Because, even though ISO and AGMA standards are the most commonly used design approaches, the design results of spur gears differ from each other interestingly. Therefore, this paper compares the spur gear design results that were performed according to ISO...

Fiber Metal Laminate (FML) consists of thin sheets of metal alloys and fiber reinforced polymer matrix (FRP) composites. This type of advanced hybrid material system is commonly used in aerospace applications mainly due to their relatively light weight, better impact and damage tolerant characteristics over both laminated fiber reinforced polymer m...

This paper firstly compares and rates three design approaches: ISO 6336 Standard and two machine design textbooks which are the most commonly used. Then it introduces ISO Conversion Factors (CFs) for the textbooks approaches. The CFs allow users to perform a simple spur gear design approach available in textbooks, and then convert the design output...

Fiber reinforced polymer matrix (FRP) composites have emerged as a major class of structural materials and have significant potential use as substitution for metals in aerospace, marine, automotive, and other industries such as architectural structures. In this study, the impact energy absorption capacities of various FRP composites were investigat...

This study compares the design results of two different types of spur gear design approaches that have different level of difficulty for module determination. One of the most important design parameter for gear design is the module (m) that is defined as the ratio of pitch diameter (d) to number of teeth (N) (m=d/N). The design of a spur gear has b...

The use of high-pressure water-jet as a cutting tool has recently increased in popularity and the most important parts of water-jet cutting machines are pressure raising units: intensifiers. The current market competition requires the design and manufacturing of the cheapest, lightest (with smaller diameters) intensifiers. These depend on obtaining...

This paper presents an evaluation of the surface roughness and geometric accuracies in drilling operations performed using U-drills without a pilot hole. The surface roughness, perpendicularity and cylindricity were used as the response parameters for evaluating the effects of the feed rate, peripheral speed, hole diameter and hole depth. The perfo...

Purpose The purpose of this paper is to apply the developed systematic mechanical design methodologies, that are obtained in part I, to investigate their success in designing mechanics of a flexible printed circuit board assembly (PCBA) rework cell. Design/methodology/approach The decision of soldering and desoldering tool, which is the most criti...

Corrugated cardboards (carton boards) are used for making containers to protect goods. Containers are made by cutting and folding a flat sheet of corrugated cardboard to obtain a desired pattern for one-piece package with fold-down corner. Undesired portions of the flat sheet cardboard are separated from the desired one-piece pattern. This may be c...

Purpose The generic design environment for a flexible printed‐circuit board assemblies (PCBA) remanufacturing cell contains four interrelated complex design domains. Mechanical design domains are really complex and the use of well‐proven mechanical product design methodologies does not help the designer. Hence, this paper aims to develop a generic...

The automotive industry's use of structural composite materials began in the 1950s. Since those early days, it has been demonstrated that composites are lightweight, fatigue resistant and easily moulded to shape in other words, a seemingly attractive alternative to metals. However, there has been no widespread switch from metals to composites in th...

In this work, nonlinear and multi-objective mathematical models were developed to determine the process parameters corresponding to optimum weld pool geometry. The objectives of the developed mathematical models are to maximize tensile load (TL), penetration (P), area of penetration (AP) and/or minimize heat affected zone (HAZ), upper width (UW) an...

In this work, nonlinear and multi-objective mathematical models were developed to determine the process parameters corresponding to optimum weld pool geometry. The objectives of the developed mathematical models are to maximize tensile load (TL), penetration (P), area of penetration (AP) and/or minimize heat affected zone (HAZ), upper width (UW) an...

Expert systems have experienced tremendous growth and popularity since their commercial introduction in the early 1980’s. Today, expert systems are used in business, science, engineering, manufacturing, medical diagnosing, chemical, and many other fields. Mechanical engineers are the major users, expert systems, are finding rapid application in ind...

In this work, the effect of various surface treatment methods used to improve the hot forging die life were investigated in the forging department of a plant located in Turkey. For this aim, the surface treatments such as one layer of aluminum titanium nitride (AlTiN) surface coating, a special multilayer coating called TOKTEK (trademarks of the Te...

Chromium plating process is the most effective way of protecting the base material against hostile environment or improving surface properties of base material. However, in electroplating industry, electro-platers are faced with many problems and undesirable results on chromium plated materials. Problems such as matt deposition, milky white chromiu...

Üniversitelerimizde son yıllarda yapılan araştırmaların sayısı ve niteliği artmasına karşın, bu durum üniversitelerimizde bilimin ulusal teknolojiye dönüşümüne yeterince olanak sağlamamıştır. Bunun asıl nedeni, üniversite-sanayi etkileşimi ve işbirliğinin ülkemizde çok geç kurgulanmaya başlanmış olmasıdır. Üniversite ve sanayi gibi farklı iki kült...

Water jet machining (WJM) systems are quickly gaining wide industrial acceptance for cutting metallic and non-metallic materials in complex shapes. However, WJM systems are not used extensively by small-scale and medium-scale industries due to their high cost. There is no commercially available WJM system to meet the requirements of small-scale ind...

Bu çalışmada ulusal inovasyon sistemimizin önemli bir aktörü olması amacı ile TÜBİTAK tarafından Üniversite-Sanayi Ortak Araştırma Merkezleri (ÜSAM) Programı (ÜSAMP) kapsamında kurulan ÜSAM' ların ülkemiz için önemi ve Adana ÜSAM da yaratılan değerler verilmektedir.

Optimization of process parameters is the key step in the Taguchi Method to achieve high quality without increasing cost. Taguchi method uses the orthogonal arrays to maximize the effect of controllable parameters and to minimize the effect of uncontrollable process parameters. In this study, Taguchi method was used to optimize the effect of TIG we...

DİRENÇ NOKTA KAYNAGINDA KAYNAK PARAMETRELERİNİN TAGUCHİ METODUYLA ANALİZİ ANALYSIS OF RESISTSANCE SPOT WELDING PARAMETERS USING TAGUCHI METHOD ÖZET: Taguchi Metodu, ortogonal dizileri kullanarak kontrol edilemeyen faktörlerin etkilerini minimize, kontrol edilenlerin ise maksimize etmeye yarayan bir deneysel tasanın tekniğidir. Bu teknikte faktör...

Ar-Ge destekleri ve teşvikleri artarak devam edeceğinden rekabetçiliği arttırmak isteyen firmalara önceki yıllar ile kıyaslanamayacak derecede destekler sunulmaktadır. Bu çalışmada Kurumsallaşmasını tamamlamış, girişimci ve yeniliğe açık firmalar için yeni Ar-Ge destekleri ve imkanlar sunulmaktadır.

Bu çalışma, TÜBİTAK-ADANA Üniversite Sanayi Ortak Araştırma Merkezi (ÜSAM)‘ınAB LEONARDO DA VİNCİ (LdV) MESLEKİ EĞİTİM PROGRAMI TÜRKİYE A TİPİ MOBİLİTY (HAREKETLİLİK) PROJESİ kapsamında yürüttüğü proje kapsamında oluşturulmuştur. Proje adı, “AB üyesi Ülkelerde KOBİ’lere uygulanan Mesleki Eğitim ve Hizmetlerin Türk KOBİ’lerine Uygulanması ve Yaygınl...

Purpose To design a flexible integrated robotic assembly and rework (remanufacturing) cell for assembly, selective assembly and rework of advanced surface mount components (SMCs) using the generic methodology developed in this paper. Design/methodology/approach Manual rework procedures are investigated for all advanced SMCs. General and specific c...

TlG kaynağında çok değişik şekillerde hazırlanmış elektrot uçları kullanılır ve bu uçların şekli çok önemlidir. Kaynak için gerekli olan optimum akımın seçilmesi elektrot uç geometrisi ile yakından ilgilidir. Bu yüzden elektrot uç geometrisi kaynak mekaniğinin temelini oluşturan kaynak havuz şeklini ve ısı tesiri altındaki bölgeyi (ITAB) etkileyen...

Paslanmaz çelikler; içerisinde en az ağırlıkça % 10,5 oranında krom (Cr) içeren demir esaslı alaşımlar olarak tanımlanırlar. Paslanmaz çeliğin yüzeyinde oluşan ince fakat yoğun krom oksit tabakası korozyona karşı yüksek dayanım sağlar ve oksidasyonun daha derine doğru ilerlemesini engeller. İçerdikleri diğer katkı elementlerine göre değişen ve tama...