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Öğe Cam Elyaf Takviyeli Beton Üretim Sektöründe Risk Faktörlerinin Belirlenmesi ve Tahmini(2017) Yıldızel, Sadık Alper; Arslan, YusufCam elyaf takviyeli betonunun inşaat endüstrisinde kullanımı estetik ve mekanik özelliklerine,hızlı ve güvenli üretimine bağlı olarak son on yılda popüler hale gelmektedir. Ancak diğer betontürleri ile karşılaştırıldığında daha karmaşık üretim süreçlerine sahiptir. Bundan dolayı detaylıüretimi için yüksek yatırımlar gerektirmektedir. Bu yüksek yatırımlar ise beraberinde çok çeşitlive fazla risk faktörlerini getirmekte ve bunların yönetimi önemli hale gelmektedir. Bu çalışma,cam elyaf takviyeli beton sektöründe risk faktörlerinin güncel tanılarını tanımlamaktadır.Öngörülemeyen maliyet artışlarının ve bu tür beton üretimindeki gecikmelerin azaltılmasıhedeflenmektedir ve sektördeki işverenler, müteahhitler ve çevreler için değer katmasıdüşünülmektedir.Öğe DIN 1.2080 SOĞUK İŞ TAKIM ÇELİĞİ ZIMBALARDA DERİN KRİYOJENİK İŞLEM VE TEMPERLEMENİN ALIN AŞINMASINA ETKİSİ(Düzce Üniversitesi, 2014) Arslan, YusufIn this study, punchs made of DIN 1.2080 cold work tool steel were subjected to the deep cryogenic treatment after deep cryogenic tempering treatment and non-treated punches were conducted on the stainless steel (AISI 304) sheet metal at punch machine and on the face wear behavior of the punches were examined. For this purpose, the tool steel punches were treated in deep cryogenic at -145o C. Additional, after deep cryogenic tempering process was made. Each punch at the end of 500th , 1000th , 1500th , 2250th , 3000th perforation, the face wears of punches were obtained by the optical stereo microscope (OM) images and the scanning electron microscope (SEM), microstructure and hardness measurements was investigated by analysis. As a result of the study, at the small number perforation, it was generally found the cryogenic treatment had positive effects on the DIN 1.2080 tool steel punches increased face wear resistance. However, the tempering treatment wasn't shown a significant effect on the face wear resistance.Öğe The effect of crojenik processing on fiber parallel pressure resistance in thermowood populus tremula wood(University of Zagreb - Faculty of Forestry, 2016) Aytin, Ayhan; Korkut, S.; Çakıcıer, Nevzat; Arslan, YusufIn this study, heat-Treated Aspen (Populus tremula L.) wood was exposed to crojenik treatment, and changes in compression strength parallel to grain (CS) values were determined according to TS 2595. Firstly, heat treatment was applied on Aspen (Populus tremula L.) wood sample for 1 hour and 2 hours at 190°C and 212°C through ThermoWood Method. Then heat treated (HT) and control samples (UT) were exposed to crojenik processing at 145°C for 24 hours. Study results have showed that all cryogenic and heat treated (HTCr) samples had 24% to %54 increases in pressure resistance values compared to the control samples. This result is significant in that it contributes to application of wooden material in different areas.Öğe The Effect of Cryogenic Treatment on Microstructure and Mechanical Response of AISI D3 Tool Steel Punches(Asme, 2015) Arslan, Yusuf; Uygur, İlyas; Jazdzewska, AgataRecently, deep cryogenic treatment is performed to improve the mechanical responses (wear, hardness, fatigue, and thermal conductivity) of various steel components. Researchers have tried to evaluate the eco-friendly and nontoxic process to optimize the parameters. Cold-shearing punches used to manufacture various holes that undergo severe impact loading and wear in the metal forming process. This study concerns the effect of soaking time (24 hr, 36 hr) at liquid nitrogen temperature (-145 degrees C) during the deep cryogenic treatment on the microstructural changes which are carbide distribution and retained austenite percentage of AISI D3 tool steel punches. It was shown that the deep cryogenic treatment reduces retained austenite and enhanced uniform distribution of carbide particles. It is concluded that for significantly improved punch life and performance, it is an advisable application of 36 hr deep cryogenic treatment.Öğe THE EFFECT OF CRYOGENIC TREATMENT ON THE PUNCH WEAR AND THE HOLE EDGE GEOMETRY(Univ Zagreb Fac Mechanical Engineering & Naval Architecture, 2020) Arslan, YusufThe ball joint parts made of forged steel are quite important in the suspension system. The quality of production of ball joint parts is very important because of their role. Some basic defects can be found in the hole edge form. These defects affect the hole quality of ball joint parts. In this study, the effects of cryogenic processing on the wear of AISI D2 punches and the effects of punch wear on the hole edge geometry of hot forged AISI 1040 steel ball joint parts were investigated. The hole geometry changes are generally associated with punch wear and process parameters. For the purpose of investigation, piercing was carried out using an eccentric press with AISI D2 tool steel punches on 6.0 mm-thick ball joint pieces. The punches were traditionally heat treated. Some of the punches were cryogenic-treated at -145 degrees C in addition to the conventional heat treatment. Weight loss values were measured to assess the punch wear, and SEM and OM images were analysed. At the end of the industrial piercing process, it was found that the D2 tool steel punch wear decreased with cryogenic process applied and the size changes in the hole edge geometry of the punched 1040 hot forged steel parts turned out to be less marked.Öğe The Effects of Cryogenic Process on the AISI M2 Punch Materials and on the Hole Edge Geometry of the DIN EN 10111-98 Sheet Metal Control Arm Parts(Hindawi Ltd, 2020) Arslan, YusufIn this study, not only the effects of cryogenic processing on the wear of AISI M2 punches but also the effects of punch wear on the hole edge geometry of DIN EN 10111-98 sheet metal control arm parts were investigated. The hole geometry changes are generally associated with punch wear and process parameters. Piercing operations were performed using eccentric press on 2.5-mm-thick sheet metal control arm parts with circular and slot AISI M2 tool steel punches. The punches were traditionally heat treated. The others were cryogenically treated at -145 degrees C in addition to the conventional heat treatment. Weight losses were measured for punch wear assessments; furthermore, SEM and OM images were analyzed. The hole edge geometries of the selected parts were measured with a contour measuring machine in the specified number of blanks. So, no damage was done to the products for measurements. The cryogenic process resulted in a significantly low amount of retained austenite and caused uniformly distributed thin carbide precipitates. Reduction of retained austenite and formation of fine carbide particles led to increase in hardness values. It was found that untreated circular punch wear weight losses were approximately 40% higher than those of cryogenically treated samples. The untreated slot punch change rate was about 106% higher than that of the cryogenically treated samples. The wear process during the punching was faster and greater for the untreated punches. Fatigue microcracks were more common at the cutting edge of the untreated punches. However, abrasive wear was generally observed in cryogenically treated punches. The edge geometry values in the circular holes were at least two times higher than those in the slot holes of untreated samples. At the end of the industrial piercing process, it was determined that the M2 tool steel punch wear rates were decreased by cryogenic treatment, and the size changes of the hole geometry of the punches of the DIN EN 10111-98 control arm parts were more economic and with a better quality.Öğe The Effects of Cryogenic Treatment on the Corrosion of AISI D3 Steel(Univ Fed Sao Carlos, Dept Engenharia Materials, 2015) Uygur, İlyas; Gerengi, Hüsnü; Arslan, Yusuf; Kurtay, MineIt is well known that cryogenic treatment is used to improve the mechanical properties of a material. Consequently, the use of cryogenic treatment has grown beyond its successful application on tool steels. In this research, the effects of cryogenic treatment on the corrosion of AISI D3 steel in 3.5% NaCl solution were examined by electrochemical impedance spectroscopy (EIS). The surface structure of the AISI D3 steel was examined by scanning electron microscopy (SEM) after the EIS investigations. Results clearly indicated that the pre-treatment of the steel was responsible for a significant effect on corrosion. The heat treatment process prior to the cryogenic treatment and the tempering process after were shown to decrease corrosion resistance.Öğe FARKLI SÜRELERDE KRİYOJENİK İŞLEM UYGULANMIŞ AISI D3 SOĞUK İŞ TAKIM ÇELİĞİ ZIMBALARDA AŞINMA DAVRANIŞLARI VE TAKIM ÖMRÜ(Düzce Üniversitesi, 2013) Arslan, Yusuf; Özdemir, AhmetIn this study, the DIN 9861 pierce punchs made of AISI D3 tool steel were subjected to the cryogenic treatment and the wear behaviour of punches were examined. For this purpose, the D3 tool steel punches in 24 and 36 hours were treated in cryogenic at -145o C . The hardness values and dimensions of punches were measured before and after cryogenic treatment. Cryogenic treated and non-treated puches were conducted on the stainless steel sheet metal which has 1,5 mm thickness for piercing. The weight losses each punch were measured at the end of 6000th , 12000th , 18000th , 24000th cycle, the face and flank wears of punches were obtained by the microscope images. Also, SEM images of wear were taken and evaluated. The wear resistanceof cryogenically treated punches are found to have increased at 24000 Number of punching, but an increase in cryogenic processing time was not affected the punch life.Öğe Investigation of the effects of deep cryogenic treatment on the structural and mechanic properties of polyoxymethylene copolymer (POM-C) materials(Sage Publications Ltd, 2022) Altınsoy, Alirıza; Arslan, YusufPolyoxymethylene is used as an engineering material in many fields such as aircraft, aviation, and automotive industries in today due to its thermal resistance and mechanical properties. In this study, it is aimed to investigate the effects on the mechanical and structural properties of polyoxymethylene copolymer (POM-C) materials, which are used in many different industrial applications, by applying cryogenic treatment. For this purpose, deep cryogenic treatment was applied to the prepared samples at -175 degrees C for 6, 12, 18, and 24 h, and then tensile, abrasion, impact, and hardness tests were applied to the samples that were kept at room temperature. In order to understand the changes in micro and crystal structures, XRD (X-Ray Diffraction), SEM (Scanning Electron Microscope), and FTIR (Fourier Transform Infrared Radiation) analyzes were performed, and based on these analyzes, the differences in the structure of the POM-C material were compared. It was observed that there was no improvement in the tensile strength of the deep cryogenically treated samples, but an increase in hardness and impact strength was detected.Öğe KRİYOJENİK İŞLEM UYGULANMIŞ SOĞUK İŞ TAKIM ÇELİĞİ ZIMBA İLE AISI 304 PASLANMAZ ÇELİK SAÇ MALZEMENİN İŞLENEBİLME PERFORMANSININ ARAŞTIRILMASI(Düzce Üniversitesi, 2013) Arslan, Yusuf; Uygur, İlyas; Bayraktar, HidayetIn this study, the DIN 9861 pierce punchs made of AISI D3 tool steel were subjected to the cryogenic treatment and the wears of punches were examined. For this purpose, the D3 tool steel punches were treated in cryogenic at -145o C. Each punch at the end of 500th , 1500th , th , 3000th cycle, the face and flank wears of punches were obtained and measured by the optical microscopy and SEM and images. It was generally found that the cryogenic treatment had positive effects on the D3 tool steel punches with increased wear resistance. It has been observed that while increasing the burnish height caused decrease in the fracture height. Hence, it was increased the rollover and burr height on blanked part edge geometry. According to the experimental results in the blanking operation, cryogenic processes have significant effects on the blanked part edge geometry for AISI 304 austenitic stainless steel sheet.Öğe Mechanical Performances of Glass Fiber Reinforced Cementitious Composites Made with Punching Scrap(Akademik Perspektif Derneği, 2019) Arslan, Yusuf; Yıldızel, Sadık AlperThis paper deals with the mechanical performances of glass fiber reinforced cementitious composites made with industrial punching scrap. Two types of scraps with diameters of 5 mm and 7 mm were used in the production of cementitious composite. The glass fibers were added at the ratio of 3 % by weight, and scrap were mixed with the weight ratios of 1%, 1.5% and 2%. Pressure, flexural strength, and shrinkage tests were carried out on the produced samples. In addition, freezing and thawing effects were also investigated. According to the results of the study, it was found that using scrap 1.5% by weight improves the properties of the pressure and flexural strength properties of the composites. It was also observed that using scrap 2% by weight waste reduces the effects, when the shrinkage behavior was examined.Öğe Polioksimetilen Kopolimerinin Su Jeti Tezgâhlarında İşlenebilirliğinin Taguchi Metodu Kullanılarak Optimizasyonu(Selim TAŞKAYA, 2021) Altınsoy, Alirıza; Arslan, YusufMühendislik polimeri olan polioksimetilen kopolimer (POM-C) yüksek çekme mukavemeti, aşınma direnci ve boyut kararlılığı gibi mekanik özelliklerinden dolayı günümüzde havacılık, otomotiv ve gemi sanayinde faaliyet gösteren birçok sanayi alanında kullanılmaktadır. Bu polimerler kullanım alanlarına göre şekillendirilmesi gerekmektedir. Şekillendirme yöntemlerden bir tanesi de su jeti tezgahlarıdır. Kesme sonrası, talaş oluşum sorununu ortadan kaldırması nedeniyle su jeti ile kesme genelde çok sert ve kırılgan olmayan malzemeler için uygundur. Polimerler, bu malzeme grubuna girmemekle birlikte, kesme işlemi esnasında yüksek ısıların oluşmaması bundan dolayı polimerlerin yapısal olarak bozulmaması, daha küçük ve karmaşık şekillerin rahatlıkla işlenmesi, su jeti ile üretimin, diğer üretim metodlarına göre daha hızlı olması, aynı zamanda mühendislik polimerlerinin pahalı olması, uygulanan metotta daha az malzemenin israf olması polimerlerin su jeti tezgahlarında işlenmesinin başlıca sebeplerindendir. Bu çalışmada polioksimetilen kopolimerine 210, 260, 310 MPa basınçta üç farklı ilerleme hızı ( 170, 240, 380 mm/dk), üç farklı aşındırıcı garnet miktarı (150, 250, 350 g/dk) su jeti tezgâhında kesme işlemi gerçekleştirilmiştir. Deney sonuçlarındaki veriler sinyal - gürültü oranı (S/N), ANOVA analizi, ve regresyon yöntemi uygulanarak incelenmiştir. Yapılan çalışma sonuçlarında su jeti tezgâhında 260 MPa basınçta 350 g/dk garnet miktarı 170 mm/dk ilerleme hızında yüzey pürüzlülüğünün diğer parametrelere göre daha düşük çıktığı, ilerleme hızının su jeti tezgahlarında en etkin parametre olduğu bulunmuştur.Öğe Punch structure, punch wear and cut profiles of AISI 304 stainless steel sheet blanks manufactured using cryogenically treated AISI D3 tool steel punches(Springer London Ltd, 2016) Arslan, Yusuf; Özdemir, AhmetCutting edge geometry and punch wear are closely associated. Punch wear increases past shape errors. These basic defects may be found on the surface of the part and characterise its quality and accuracy. Punch errors are largely associated with punch wear and process parameters. The aim of this study was to investigate the effect of cryogenically treated punches on stainless steel sheet blanking shape errors. For this purpose, the blanking was carried out in a punch machine using 7- and 9-mm-diameter AISI D3 cold work tool steel punches and 1.5-mm-thick AISI 304 austenitic stainless steel sheets. One punch group was subjected to the cryogenic process at -145 A degrees C in addition to the conventional heat treatment. The cryogenic process was carried out to improve the wear resistance and product quality. For this study, punch weight losses were measured and punch wear was evaluated through analysis of SEM and OM images. The rollover depth, burnish depth, fracture depth, burr height and angle of fracture of the selected parts were measured in the specified number of blanks. Results showed that the cryogenic process increased the wear performance of the punches and reduced the shape errors of the parts.Öğe Steel scrap added roller compacted concrete(2019) Armağan, Kemal; Yıldızel, Sadık Alper; Arslan, YusufThe purpose of this paper is to investigate the benefits of using steel slag as an addi-tive in Roller Compacted Concrete (RCC) which is a promising material can be usedin streets, local roads, residential streets, high-volume roads, industrial access roads,airports...etc. The mechanical performances of steel scrap added reinforced cementi-tious composites produced with an industrial punch scrap. In specimen mixtures twotypes of scraps with diameters of 5 mm and 7 mm were used. The additive was mixedwith 1%, 1.5% and 2% ratios by weight. Due to the results of the study, it was ob-tained that flexural strength properties of the specimens have increased up to 11%.In addition, freeze thaw effect of the specimens was investigated and found that 2%percent of scrap usage was given the best results.Öğe Weight losses estimation of industrial punch tools(2019) Arslan, YusufMany studies have been conducted on the estimation of weight losses of industrial tools; however, these investigations are very rare. And there is no prediction study on the weight loss of industrial punches. An artificial neural network model (ANN) was proposed in order to establish relationships with the field data including input parameters as punch diameter, punch stroke, stroke noise, and punch temperature and output parameter as weight loss of punch. Effect of each parameter on the weight loss of industrial punch was analyzed with the developed model. An empirical formula was also obtained with the generalization capabilities of the ANN system. Analysis results showed that the estimation results are in good agreement with the field data. And these numerical results with high efficiency can make it possible to use the neural designs for real-life industrial punch estimation applications.
