Kaya, Serhat

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Kaya, Serhat
S.,Kaya
Kaya,S.
K., Serhat
K.,Serhat
Serhat, Kaya
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Doktor Öğretim Üyesi
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Scholarly Output

5

Articles

4

Citation Count

24

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0

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2011 - 201932020 - 20232
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Now showing 1 - 5 of 5
  • Thumbnail Image
    Article
    Citation Count: 10
    Evaluating porthole and seamless aluminum tubes and lubricants for hydroforming
    (Springer London Ltd, 2015) Kaya, Serhat; Automotive Engineering
    The effect of extrusion method and lubrication on formability of aluminum tubes in hydroforming is experimentally investigated. First, the formability differences between seamless and porthole aluminum 6063 and 6260 alloy tubes, at T1 and T6 heat treatment conditions, are studied using free bulging. Second, the performances of a wide range of lubricants are ranked using zone-dependent friction tests, e.g., guiding zone and expansion zone, which emulate the two different interface mechanics existing in a THF operation. Results showed that seamless tubes, under any condition, give 5 % more expansion compared to porthole. Also, if a tube has T6 condition, seamless shows clear formability advantage over porthole. However, porthole is found to be quite satisfactory for tubes at T1 condition since they achieved more than % 10 expansion. "Zone-dependent" (expansion zone and guiding zone) lubrication tests are conducted using wet and dry lubricants. Results showed that while a dry lubricant performed best in the expansion zone, a wet lubricant performed best in the guiding zone.
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    Editorial
    Citation Count: 0
    Intracranial dermoid cyst mimicking a thrombosed giant aneurysm of the anterior communicating artery
    (Ma Healthcare Ltd, 2022) Kaya, Serhat; Koksa, Ali; Kaya, Serhat; Kantarci, Mecit; Eren, Suat; Automotive Engineering
    [No Abstract Available]
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    Article
    Citation Count: 11
    Nonisothermal warm deep drawing of SS304: FE modeling and experiments using servo press
    (Springer London Ltd, 2016) Kaya, Serhat; Automotive Engineering
    Experimental and viscoplastic finite element analysis (FEA) of thermo-mechanical plastic deformation in nonisothermal warm deep drawing is studied using SS304. A nonisothermal deep drawing tool is used in a servo-motor-controlled press. Drawability window of SS304 under elevated temperatures (25-225 A degrees C) and low to high strain rates (drawing speeds of 2.5, 25, and 50 mm/s) were determined. A viscoplastic thermal material model is adopted for nonwork softening material behaviors, as seen in low-temperature forming of SS304, and found to be easily applicable and quite satisfactory. Tensile and equi-biaxial bulge tests were conducted for more accurate flow stress data to be used in FEA. Measured punch load-stroke and cup's curvilinear thickness (rolling/transverse) curves were successfully compared with predictions from the nonisothermal FE model of the warm deep drawing.
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    Article
    Citation Count: 3
    Using Servo-Drive Presses to Determine the Effect of Blank Holder Pressure on Temperature Change in Warm Forming of Sheet
    (Asme-amer Soc Mechanical Eng, 2011) Kaya, Serhat; Automotive Engineering
    Heat transfer coefficient (HTC) is one of the most important and difficult-to-obtain parameter in high temperature environment. Contact pressure and workpiece surface roughness are among important parameters that affect the heat transfer in elevated temperature forming of sheets. In this study, HTCs are investigated experimentally by using a servo-drive press. With the flexibility that the servo-drive press offers, effect of various blank holder pressures on temperature change is determined. Before and after surface roughness conditions of aluminum and magnesium (from two different manufacturers) alloy sheets are compared. Experimental setup was modeled using deform 2D, and measured temperature curves were compared with the finite element analysis (FEA) predictions and a window of heat transfer coefficients were determined for warm forming of sheets. Determined heat transfer coefficients were implemented in a nonisothermal deep drawing FE model in deform 2D and results were compared with experiments. Good agreement was obtained between FEA predictions and experiments.
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    Article
    Citation Count: 0
    Magnetic resonance arthrographic demonstration of extension of labral defects in paraglenoid labral cysts
    (Assoc Medica Brasileira, 2023) Köksal, Ali; Ogul, Hayri; Kaya, Serhat; Koru, Ahmet; Kiziloglu, Alper; Kantarci, Mecit; Medical Imaging Techniques Program; Automotive Engineering
    OBJECTIVE: This study aimed to investigate the extension of labral tears associated with paraglenoid labral cysts by magnetic resonance arthrography. METHODS: The magnetic resonance and magnetic resonance arthrography images of patients with paraglenoid labral cysts who presented to our clinic between 2016 and 2018 were examined. In patients with paraglenoid labral cysts, the location of the cysts, the relation between the cyst and the labrum, the location and extent of glenoid labrum damage, and whether there was contrast medium passage into the cysts were investigated. The accuracy of magnetic resonance arthrographic information was evaluated in patients undergoing arthroscopy. RESULTS: In this prospective study, a paraglenoid labral cyst was detected in 20 patients. In 16 patients, there was a defect in the labrum adjacent to the cyst. Seven of these cysts were adjacent to the posterior superior labrum. In 13 patients, there were contrast solution leak into the cyst. For the remaining seven patients, no contrast-medium passage was observed in the cyst. Three patients had sublabral recess anomalies. Two patients had rotator cuff muscle denervation atrophy accompanying the cysts. The cysts of these patients were larger compared to those of the other patients. CONCLUSION: Paraglenoid labral cysts are frequently associated with the rupture of the adjacent labrum. In these patients, symptoms are generally accompanied by secondary labral pathologies. Magnetic resonance arthrography can be successfully used not only to demonstrate the association of the cyst with the joint capsule and labrum, but also to reliably demonstrate the presence and extension of labral defects.