Yazar "Ceylan, Bayram" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim
    Öğe
    The Design of Fatigue Test Machine and the Analysis of Fatigue Behavior of FSWed Dissimilar Aluminum Alloys
    (Springer, 2022) Yuruk, A.; Ceylan, Bayram; Kahraman, N.
    Aluminum alloys have low density and high yield strength, thus leading them to be commonly used in aircrafts, sea vessels and land vehicles to acquire light weight and their use in these industries has been increasing every passing day. It is necessary to assemble many dissimilar aluminum alloys in such a way that they fit one another in the application. However, the parts made of these alloys are exposed to very different stresses (tensile, bending, impact, etc.) and fatigue occurs in the parts working especially under dynamic loads by causing structural damage. In this study, a computer-based fatigue test machine was designed and manufactured in order to do the fatigue tests for plate-type materials. This machine was used for the fatigue tests of dissimilar aluminum alloys (AA5754/AA6013) welded by the friction stir welding (FSW). FSW was carried out at 12.5, 25, and 32 mm/min welding feed rates and 1250 rpm. In addition, metallographic examinations and hardness tests were carried out to determine macrostructural and microstructural properties of weld zones and the effects of the joints on fatigue strength. The findings of the tests were evaluated and interpreted. The new machine successfully tested the fatigue of the FSWed samples. It was determined that in FSW, welding feed rate and material type were effective on the heat input, microstructure, hardness distribution of the weld zone and fatigue strength and life of the joints.
  • Küçük Resim
    Öğe
    Impact of time-of-day on judo-specific performance
    (Univ Leon, Fac Ciencias Actividad Fisica & Deporte, 2022) Öztürk, Furkan; Ceylan, Bayram; Balcı, Şükrü Serdar
    In judo tournaments, matches for each weight category are held on the same day and athletes competing at the finals have to compete at different times of the day. This study aimed to investigate the effect of time-of-day on judo specific performance and the changes in physiological load following judo specific performance. Fourteen male judo athletes (age 19.1 +/- 1.4 years) voluntarily participated in the study. At the 1st visit, anthropometrical measurements and familiarization procedures were conducted and the athletes' chronotype was determined. Athletes performed the Special Judo Fitness Test (SJFT) during 2nd and 3rd visits. Athletes randomly performed two consecutive SIFTs with 15 min intervals at 10:00h, which is the official start time of matches, and at 18:00h which is the time when the finals start. During SJFT applications, athletes heart rate (HR), blood lactate (bLA), body temperature and rate of perceived exertion (RPE) were monitored. The changes in total throw numbers (F-1,F-13= 1.32, p=0.27) and SJFT index (F-1,F-13= 0.30, p=0.59) were not different between morning and evening. There were similar changes in bLA (F-4,F-52=0.66, p=0.63), RPE (F-1,F-13=1.42, p=0.26) and body temperature (F-1.4,F-18.0=1.18, p=0.31) which were measured before and after the tests. However, HR measured in the evening were higher compared to morning measurement at all measurement times (F-1,F-13=10.28, p=0.01), but there was no difference in SJFT throws (F-3.8,F- 48.8=0.49, p=0.74). In conclusion, different times of the day did not affect judo specific performance as well as physiological variables in judo athletes.
  • Küçük Resim Yok
    Öğe
    Ulusal ve Uluslararası Türk Judocularda Elpençe Kuvveti
    (Düzce Üniversitesi, 2022) Ceylan, Bayram; Öztürk, Furkan
    Bu çalışmanın amacı uluslararası ve ulusal seviyedeki judocuların maksimal el pençe kuvvetini belirlemek ve karşılaştırmaktır. Çalışmaya 18 uluslararası ve 16 ulusal seviyede erkek sporcu gönüllü olarak katıldı. Antropometrik ölçümler sonrasında sporcular 1 dakika ara ile her el için rastgele 3 kez maksimal el pençe kuvvet testini gerçekleştirdi. Grupların performanslarını karşılaştırmak için bağımsız örneklemlerde T test kullanılırken, değişkenler arasındaki ilişkiyi belirlemek için Pearson korelasyon testi kullanıldı. Analamlılık düzeyi p lt;0,05 olarak kabul edildi. Gruplar arasında vücut ağırlığı, boy, vücut kütle indeksi, sağ, sol ve toplam rölatif el pençe kuvvetinde anlamlı farklılık tespit edildi (p lt;0,05). değişkenler arasındaki ilişki incelendiğinde, vücut ağırlığı ve vücut kütle indeksi ile maksimal el pençe kuvveti arasında anlamlı ilişki tespit edildi (p=0,00). Sınıflandırma tablosu ile değerlendirildiğinde, sporcuların çoğu sağ mutlak ve rölatif, sol mutlak ve rölatif ve toplam mutlak ve rölatif el pençe kuvvetinde sıradan olarak sınıflandırıldı. Rölatif el pençe kuvveti düşünüldüğünde, uluslararası seviyedeki sporcular ulusal seviyedeki sporculardan daha iyi performans ortaya koydu, ancak ulusal seviyedeki sporcular rölatif performansta daha iyi sonuçlar ortaya koymuştur