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Dergiler / Demiryolu Mühendisliği / 2026 / Sayı: 24

Demiryolu Araçlarının Kompozit Fren Bloklarında Islak Koşullarda Ortaya Çıkan Fren Zayıflaması Problemi Karşısında Vulkasil Kullanımının İncelenmesi

Investigation of the Use of Vulkasil Against Brake Weakening Problem Occurring Under Wet Conditions in Composite Brake Blocks of Railway Vehicles

Abdülkadir Ünal(İSTANBUL TEKNİK ÜNİVERSİTESİ)0000-0002-7167-1536
Ozan Demirdalmış(YILDIZ TEKNİK ÜNİVERSİTESİ)0000-0003-2060-4795
Sayfa
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Yayın Tarihi
2026-02-14
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⚡ TL;DR(1 Cümlede Hızlı Çıkarım)

Geliştirilen numuneler laboratuvar ortamında fiziksel ve mekanik testlere tabi tutulmuş, atalet tipi dinamometre testleriyle sürtünme performansı değerlendirilmiş; elde edilen bulgular gerçek demiryolu koşullarında gerçekleştirilen saha testleriyle doğrulanmıştır.

📌 3 Maddede Bu Makale

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Amaç & Hipotez:Fren balataları üzerine yapılan araştırmalar genellikle kuru koşullar üzerine yoğunlaşsa da, gerçek işletme şartlarında maruz kalınan ıslak koşullar sürtünme katsayısında ciddi düşüşlere ve trafik emniyetini tehdit eden fren zayıflamasına neden olmaktadır.
📊
Temel Bulgular & Veri:Geliştirilen numuneler laboratuvar ortamında fiziksel ve mekanik testlere tabi tutulmuş, atalet tipi dinamometre testleriyle sürtünme performansı değerlendirilmiş; elde edilen bulgular gerçek demiryolu koşullarında gerçekleştirilen saha testleriyle doğrulanmıştır.
💡
Sonuç & Katkı:Deneysel sonuçlar, Vulkasil S içermeyen fren bloklarında ıslak koşullar altında sürtünme katsayısının yaklaşık %20 oranında azaldığını, Vulkasil S takviyeli bloklarda ise bu düşüşün sadece %5 seviyesinde kalarak istikrarlı bir frenleme performansı sağlandığını göstermiştir.
🔬Tür:Laboratuvar & Saha Deneyi
📍Kapsam:Genişletilmiş Akademik Örneklem
⚙️Değişkenler:Vulkasil S · Blok balata · Sürtünme katsayısı

Özet

Fren balataları üzerine yapılan araştırmalar genellikle kuru koşullar üzerine yoğunlaşsa da, gerçek işletme şartlarında maruz kalınan ıslak koşullar sürtünme katsayısında ciddi düşüşlere ve trafik emniyetini tehdit eden fren zayıflamasına neden olmaktadır. Bu çalışmada, kuru koşullarda yüksek performans gösteren ancak ıslak koşullarda performans kaybı yaşayan K tipi kompozit fren bloğu bileşimine Vulkasil S takviyesi yapılarak bu problemin giderilmesi amaçlanmıştır. Geliştirilen numuneler laboratuvar ortamında fiziksel ve mekanik testlere tabi tutulmuş, atalet tipi dinamometre testleriyle sürtünme performansı değerlendirilmiş; elde edilen bulgular gerçek demiryolu koşullarında gerçekleştirilen saha testleriyle doğrulanmıştır. Deneysel sonuçlar, Vulkasil S içermeyen fren bloklarında ıslak koşullar altında sürtünme katsayısının yaklaşık %20 oranında azaldığını, Vulkasil S takviyeli bloklarda ise bu düşüşün sadece %5 seviyesinde kalarak istikrarlı bir frenleme performansı sağlandığını göstermiştir.

Abstract

While research on brake blocks typically focuses on dry conditions, the wet conditions encountered in actual operation cause significant reductions in the coefficient of friction, leading to brake fade that jeopardizes railway operational safety. This study aims to mitigate this issue by reinforcing a K-type composite brake block composition, which performs well in dry conditions but suffers performance loss in wet conditions, with Vulkasil S. The developed specimens underwent physical and mechanical testing in a laboratory setting, were additionally evaluated using an inertia-type dynamometer, and the findings were validated through field tests under real railway conditions. Experimental results demonstrated that the coefficient of friction for brake blocks without Vulkasil S decreased by approximately 20% under wet conditions, whereas Vulkasil S-reinforced blocks limited this reduction to just 5%, thereby ensuring stable braking performance.

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Bu Makaleye Atıf Yap

Ünal, A., Demirdalmış, O. (2026). Demiryolu Araçlarının Kompozit Fren Bloklarında Islak Koşullarda Ortaya Çıkan Fren Zayıflaması Problemi Karşısında Vulkasil Kullanımının İncelenmesi. Demiryolu Mühendisliği, Sayı: 24. https://doi.org/10.47072/demiryolu.1840189

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