Dolgusuz ve hibrit kompozitlerin delme performansının ve mekanik özelliklerinin incelenmesi

Öz

Kompozit malzemelerin içerdiği dolgu ve takviye parçacıklarının özellikleri ve oranları kompozit malzemelerin çekme ve eğme gibi mekanik özelliklerini etkilemektedir. Ayrıca kompozit malzemelerin montaj ve bağlantıları için delme işlemi büyük bir önem arz etmektedir. Bu yüzden farklı işleme parametrelerde kompozit malzemelerin delinmesinde meydana gelen delaminasyonlar ve ilerleme kuvvetleri birçok araştırmaya konu olmuştur. Bu çalışmanın amacı Gr ve B4C dolgularının karbon elyaf takviyeli kompozitlere ilave ederek dolguların kompozitin mekanik özellikleri ve işlenebilirliği üzerindeki etkilerini araştırmaktadır. El yatırma yöntemiyle %7.5 B4C ve %7.5 Gr dolguları kullanılarak üretilen kompozitlerin çekme ve eğilme dayanımları belirlenmiştir. Dolgu parçacıklarının kompozitin çekme dayanımını düşürdüğü, eğilme dayanımını ise arttırdığı anlaşılmıştır. Kompozit iş parçalarına 4 farklı ilerleme oranı ve kesme hızında boydan boya delik delme işlemi uygulanmıştır. Ayrıca dolgusuz ve hibrit dolgulu kompozitlerin delinmesinde ilerleme oranı ve kesme hızı gibi işleme parametrelerinin ilerleme kuvveti ve delaminasyon faktörü üzerindeki etkisi incelenmiştir. İlerleme oranının artması delaminasyon faktörünü olumlu etkilerken, kesme hızının artması olumsuz etkilemektedir. Karbon elyaf takviyesine dolgu ilave edilmesi ise delaminasyon miktarını düşürmüş, ilerleme kuvvetlerini ise arttırmıştır.

Anahtar Kelimeler

• Mekanik özellikler
• Delme
• Delaminasyon
• Karbon Elyaf
• B4C
• Gr

Proje Numarası

BTÜBAP-2021-YL-020

Teşekkür

Yazarlar, bu deneysel çalışmanın gerçekleştirilmesinde her türlü katkı ve desteklerini sağlayan Batman Üniversitesi BAP birimine (BTÜBAP-2021-YL-020 no’lu proje) teşekkür eder.

Investigation of drilling performance and mechanical properties of unfilled and hybrid composites

Öz

The properties and ratios of filler and reinforcement particles in composite materials affect the mechanical properties of composite materials such as tensile and flexural. In addition, the drilling process is of great importance for the assembly and connections of composite materials. Therefore, delaminations and feed forces that occur in drilling composite materials at different machining parameters have been the subject of many studies. The aim of this study is to investigate the effects of adding Gr and B4C fillers to carbon fiber-reinforced composites on the mechanical properties and machinability of the composites. Tensile and flexural strengths of the composites, produced using hand lay-up method with 7.5% B4C and 7.5% Gr fillers, were determined. It was found that the filler particles reduced the tensile strength of the composites but increased their flexural strength. Through-hole drilling was applied to composite workpieces at 4 different feed rates and cutting speeds. Additionally, the effects of machining parameters such as feed rate and cutting speed on thrust force and delamination factor during the drilling of both unfilled and hybrid-filled composites were examined. While an increase in feed rate positively affected the delamination factor, an increase in cutting speed had a negative impact. Moreover, the addition of fillers to carbon fiber reinforcement reduced the amount of delamination but increased the thrust forces.

Anahtar Kelimeler

• Mechanical properties
• Drilling
• Delamination
• Carbon Fiber
• B4C
• Gr

Proje Numarası

BTÜBAP-2021-YL-020

Kaynakça

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