EPDM kauçuk hortumlarda aramid takviyesinin mekanik özellikleri ve yaşlanma direnci üzerindeki etkisi
Küçük Resim Yok
Tarih
2025
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Bursa Teknik Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Bu tez çalışmasında, otomotiv sektöründe yaygın olarak kullanılan sentetik kauçuk türlerinden biri olan aramid takviyeli EPDM (etilen-propilen-dien monomer) kauçuğu kapsamlı bir şekilde incelenmiştir. EPDM, üstün ısı, ozon, yaşlanma ve kimyasal dayanımı sayesinde motor bölgesi gibi yüksek sıcaklık, titreşim ve basınca maruz kalan zorlu çalışma koşullarında tercih edilmektedir. Aramid takviye yapısı ise hortumların mekanik dayanımını, esnekliğini, burkulma direncini ve boyutsal kararlılığını artırmak amacıyla kullanılmaktadır. Üretim sürecinde, karbon siyahı, dolgu maddeleri, vulkanizasyon ajanları, hızlandırıcılar, antioksidanlar ve işlem yardımcıları belirli oranlarda karıştırılarak kauçuk hamurları hazırlanmış, ardından otoklav ortamında vulkanizasyon işlemi gerçekleştirilmiştir. Farklı aramid iplik kalınlıkları (930, 1100 ve 1680 dtex) ile hatve mesafeleri (2,9 mm, 3,3 mm ve 4,0 mm) kullanılarak numuneler üretilmiş ve bu parametrelerin hortum performansına etkisi sistematik olarak değerlendirilmiştir. Deneysel çalışmalar kapsamında, üretilen hortumların morfolojik özellikleri SEM (taramalı elektron mikroskobu) analiziyle incelenmiş; kat yapışma, patlatma, çap genişleme, çekme, sertlik ve uzama testleri ile mekanik özellikleri detaylı olarak araştırılmıştır. Elde edilen sonuçlar, aramid takviye oranı ve örgü parametrelerinin hortumların basınç dayanımı, deformasyon davranışı, elastikiyet, yorulma direnci ve kat yapışma mukavemeti üzerinde belirleyici bir etkiye sahip olduğunu göstermiştir. Sonuç olarak, bu çalışma EPDM matrisli aramid takviyeli hortumların yapısal, morfolojik ve mekanik performansına dair bütüncül bir değerlendirme sunmakta; malzeme seçimi, üretim koşulları ve takviye optimizasyonu konularında hem akademik araştırmalara hem de otomotiv endüstrisindeki uygulamalara önemli katkılar sağlamaktadır.
In this thesis study, aramid-reinforced EPDM (ethylene propylene diene monomer) rubber, one of the synthetic rubber types widely used in the automotive industry, was comprehensively investigated. Owing to its superior heat, ozone, aging, and chemical resistance, EPDM is preferred in harsh operating conditions such as the engine compartment, where high temperature, vibration, and pressure are present. The aramid reinforcement structure, on the other hand, is employed to enhance the mechanical strength, flexibility, buckling resistance, and dimensional stability of the hoses. During the production process, carbon black, fillers, vulcanization agents, accelerators, antioxidants, and processing aids were mixed in specific proportions to prepare rubber compounds, followed by vulcanization in an autoclave. Hoses were manufactured using different aramid yarn thicknesses (930, 1100, and 1680 dtex) and pitch distances (2.9 mm, 3.3 mm, and 4.0 mm), and the influence of these parameters on hose performance was systematically evaluated. Within the scope of the experimental studies, the morphological properties of the produced hoses were examined using SEM (Scanning Electron Microscopy), while their mechanical behaviors were investigated through adhesion, burst pressure, diameter expansion, tensile, hardness, and elongation tests. The results revealed that the aramid reinforcement ratio and braiding parameters have a significant effect on the pressure resistance, deformation behavior, elasticity, fatigue strength, and layer adhesion performance of the hoses. In conclusion, this study provides a comprehensive evaluation of the structural, morphological, and mechanical performance of EPDM-based aramid-reinforced hoses and offers valuable insights into material selection, production conditions, and reinforcement optimization, contributing to both academic research and industrial applications in the automotive field.
In this thesis study, aramid-reinforced EPDM (ethylene propylene diene monomer) rubber, one of the synthetic rubber types widely used in the automotive industry, was comprehensively investigated. Owing to its superior heat, ozone, aging, and chemical resistance, EPDM is preferred in harsh operating conditions such as the engine compartment, where high temperature, vibration, and pressure are present. The aramid reinforcement structure, on the other hand, is employed to enhance the mechanical strength, flexibility, buckling resistance, and dimensional stability of the hoses. During the production process, carbon black, fillers, vulcanization agents, accelerators, antioxidants, and processing aids were mixed in specific proportions to prepare rubber compounds, followed by vulcanization in an autoclave. Hoses were manufactured using different aramid yarn thicknesses (930, 1100, and 1680 dtex) and pitch distances (2.9 mm, 3.3 mm, and 4.0 mm), and the influence of these parameters on hose performance was systematically evaluated. Within the scope of the experimental studies, the morphological properties of the produced hoses were examined using SEM (Scanning Electron Microscopy), while their mechanical behaviors were investigated through adhesion, burst pressure, diameter expansion, tensile, hardness, and elongation tests. The results revealed that the aramid reinforcement ratio and braiding parameters have a significant effect on the pressure resistance, deformation behavior, elasticity, fatigue strength, and layer adhesion performance of the hoses. In conclusion, this study provides a comprehensive evaluation of the structural, morphological, and mechanical performance of EPDM-based aramid-reinforced hoses and offers valuable insights into material selection, production conditions, and reinforcement optimization, contributing to both academic research and industrial applications in the automotive field.
Açıklama
Anahtar Kelimeler
Polimer Bilim ve Teknolojisi, Polymer Science and Technology
