INVESTIGATION OF THE WEAR BEHAVIOR OF ALUMINUM ADDED BRAKE FRICTION COMPOSITES

Sugözü, Banu | Sugözü, İlker

ORTAK SAĞLIK VE GÜVENLİK BİRİMİNDE ÇALIŞAN İŞ GÜVENLİĞİ UZMANLARININ İŞ HAYATINDA YAŞADIĞI STRES VE ETKİLERİ

Sugözü, İlker | Sugözü, Banu

Bioactive compounds and physical attributes of Cornus mas genotypes through multivariate approaches

Demir, Bünyamin

Cornelian cherry fruits are quite rich in bioactive compounds. Natural colour, rich flavonoids and anthocyanins and high antioxidant activity have made the fruits a natural drug. In the present study, antioxidant activity, total flavonoids and total phenolics of naturally growing 18 cornelian cherry genotypes with different phenotypic characteristics were determined. Size and shape parameters of the genotypes were also determined with the image-processing method; sphericity, elongation and shape index were calculated and shapes of two-dimensional fruit images were compared with elliptic Fourier analysis. Antioxidant activity, total flavonoid contents and total phenolic amounts of the genotypes were varied between 55.062 and 152.420 mmol TE · kg−1, 286.40 and 2,882.80 mg QE · kg−1, and 2,64...

Investigation of The Effect of Solid Lubricant Particle Sizes on Friction and Wear Properties in Friction Composites: An Experimental Case Study with Graphite

Sugözü, İlker | Sugözü, Banu

Friction composites consist of many materials with various properties. Solid lubricant is one of these materials. The task of the solid lubricant in the compo-site is to protect the counter surfaces against wear and to reduce noise and vibra-tion. Typical solid lubricants used in the friction composite are graphite, antimo-ny trisulfide, molybdenum disulfide, copper sulfide, etc. The selection suitable solid lubricants for better braking performance is an important issue, as solid lubricants may decompose at high temperatures, leading to undesirable results. The particle size of the solid lubricant used is at least as important as itself. In this study, the effect of micro and nanoparticle-sized graphite on friction and wear behavior of friction composites was investigated experimentally. ...

EFFECT OF VEHICLE BRAKE PRESSURE ON WEAR RATE

Sugözü, İlker | Sugözü, Banu

THE EFFECT OF POROSITY ON THE TRIBOLOGICAL PROPERTIES OF POLYMER MATRIX BRAKE FRICTION MATERIALS

Sugözü, Banu | Sugözü, İlker

Tribological properties of brake friction materials containing fly ash

Sugözü, Banu

Purpose The purpose of this study is to investigate the potential of fly ash in automotive brake lining materials. Design/methodology/approach Three brake linings containing fly ash (36, 41 and 46 Wt.%) were designed and produced by dry-mixing, pre-forming and hot pressing. The surface hardness of all brake lining samples was measured by using Brinell hardness tester. The density of the specimens was determined based on Archimedean principle in water. The friction and wear characteristics of the brake lining samples were determined using a real brake disc-type tester. Detailed examinations on the worn surface were analyzed using a scanning electron microscopy. Findings Fly ash can be good alternative as space filler to reduce the cost for brake lining. Originality/value The present study h...

POLİMERİK KOMPOZİT SÜRTÜNME MALZEMELERİ İLE BALATA ÜRETİMİNDE SOĞUK PRESLEME BASINCININ FRENLEME PERFORMANSINA ETKİSİ

Sugözü, Banu

Morphological Characteristics of Grapevine Cultivars and Closed Contour Analysis with Elliptic Fourier Descriptors

Demir, Bünyamin

Morphology is the most visible and distinct character of plant organs and is accepted as one of the most important tools for plant biologists, plant breeders and growers. A number of methods based on plant morphology are applied to discriminate in particular close cultivars. In this study, image processing analysis was used on 20 grape cultivars (“Amasya beyazı“, “Antep karası“, “Bahçeli karası”, “Çavuş“, “Cevşen“, “Crimson“, “Dimrit“, “Erenköy beyazı“, “Hafızali“, “Karaşabi“, “Kırmızı“, “İzabella (Isabella) “, “Morşabi“, “Müşgüle“, “Nuniya“, “Royal“, “Sultani çekirdeksiz (Sultanina)“, “Yalova incisi“, “Yerli beyazv“, “Yuvarlak çekirdeksiz“) to classify them. According to image processing analysis, the longest and the greatest projected area values were observed in “Antep karası“ cultivar....

Effectiveness of Different Weed Management Methods in Silage Maize (Zea mays L.) and Effect on Yield

Demir, Bünyamin

In this study, the determination of the effect of band herbicide, hoeing, brushing and flaming methods that has been used especially row crops on weed management on the parameters of weed management and yield in silage maize has been aimed. Tillage, seed bed preparation, planting and fertilization were applied at the all area of experiment plots with the same method weed management tool and machines have been run at three different ground speeds. After application the number of weeds in the experimental areas were determined using the framework with 0.5 m2 and compared with the control plots. The best weed control in the weed management areas was determined in the lowest ground speed of Band Herbicide Method with a value of 79% in the 1st year and 81% in the 2nd year. The speed increasing ...

Physical characteristics of cherry (Prunus avium) varieties and shape analysis with the elliptic Fourier method

Demir, Bünyamin

Knowing the physical properties of biological products is of great importance in terms of developing harvesting technologies, innovating crop processing technologies and determining product drying properties. The aim of this study was to determine the dimensional and shape attributes of two different cherry types (‘10-5’ and ‘10-22’) and six different cherry varieties (‘Ferbolus Verdel’, ‘Lapins’, ‘Merton Late’, ‘Noir de Guben’, ‘Starks Gold’ and ‘Telegal’) and to put forth the differences and similarities of cherry varieties. For dimensional parameters, the greatest averages were observed in ‘10-22’ type and smallest averages were observed in ‘Telegal’ variety. Dimension properties of ‘Merton Late’, ‘Noir de Guben’ and ‘Starks Gold’ varieties were similar. ‘Telegal’ variety had the greate...

Low cost measurement setup based on a piezoelectric microphone for estimating apple bruising using Shannon entropy

Demir, Bünyamin

This study presents a low cost measurement setup for estimating apple bruise volume during drop impact tests. The proposed measurement system consists of three main stages namely recording impact sound, signal processing, and estimating bruise volume. In the recording stage, the impact sound occurred when striking the apple on the surface was recorded by a piezoelectric microphone into computer. The impact sound was converted into Shannon entropy signals based on the Kernel density approach, and two measurable quantities namely entropy peak and pulse-width time were extracted from Shannon entropy signals in the signal processing stage. In the bruise volume estimating stage, the regression curves that map entropy peak and pulse-width features into bruise volume are estimated using measureme...

The effect of ulexite to the tribological properties of brake lining materials

Sugözü, İlker | Sugözü, Banu

Recently, different brake pads have started to be investigated in brake friction industry by replacing the asbestos with new materials. This paper presents the role of Ulexite on friction assessment and screening Test of newly formulated brake pads. Friction coefficient, specific wear ratio, and scanning electron microscope SEM for friction surfaces were examined to assess the performance of brake pads. From the results, they concluded that the friction material containing Ulexite improved friction stability and fade resistance. Further, for heat treated samples they claimed a higher and stable friction coefficient

Biochemical composition and shape-dimensional traits of rosehip genotypes

Demir, Bünyamin | Alkaya, Günseli Bobuş

In the present study, the biochemical composition and shape and dimensional traits of 25 rosehip (Rosa canina) genotypes were investigated. The shape and dimensional traits were determined by image processing technique. Seed-propagated rosehip genotypes belonging to R. canina were collected from the natural flora of Mesudiye (Ordu) and Talas (Kayseri) districts. Antioxidant activity (39.510–72.673 mmol · kg−1), total flavonoids (287.80–1,686.20 mg quercetin equivalent (QE) · kg−1) and total phenolics (38,519.40–79,080.60 mg gallic acid equivalent · kg−1) of the genotypes exhibited large variations. Width (12.2 mm) and thickness (12.5 mm) of fruits averages were found to be close to each other. The genotypes exhibited fruit lengths between 12.0 mm and 29.5 mm. Average projected area at hori...

The Effect of Wearing Brake Lining Surface on Braking Performance

Sugözü, İlker | Sugözü, Banu

After braking, different wear types and micro-macro gaps occur on the brake lining surface. This situation varies depending on the amount of binder, friction modifier, reinforcement, lubricant and filler materials used in the brake lining content and braking conditions. In this study, the effect of brake lining surface morphology, which is worn after braking, on the tribological properties of the brake lining was investigated. In this context, the wearing surfaces of the brake lining after braking were examined. It has been observed that the braking performance increases depending on the rate of wear types seen on the brake lining surface.

INVESTIGATION OF THE EFFECT OF SURFACE ROUGHNESS ON FRICTION PERFORMANCE OF BRAKE PAD

Sugözü, Banu | Sugözü, İlker