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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 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 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 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.