Mechanical Properties and Deformation Behavior of Al/Al-SiC Double-Walled Composite Pipes Under Radial Loading

Year 2024, Volume: 40 Issue: 1, 45 - 55, 30.04.2024

İsmet Aydın Yılmaz , Abdullah Göçer , Mehmet Karamış

Abstract

Kompozit malzemeler üretim amaçlarına bağlı olarak farklı malzeme yapılarında üretilirler. Bu çalışmada mukavemet özelliklerinin arttırılması ile beraber şekil değiştirme kabiliyeti kısmen korunan bir dairesel profil malzeme üretilmesi amaçlanmıştır. Malzeme çift cidarlı üretilmiş olup dış cidar Al6061, iç cidar ise Al2124-SiC metal matrisli kompozitten oluşmaktadır. Malzeme değişkenleri cidar kalınlıklarının ve SiC takviye oranlarının değişimidir. Malzemeler, iç-dış cidar kalınlıkları sırasıyla 1.5-0.5 mm, 1-1 mm ve 0.5-1.5 mm olacak şekilde 3 farklı kalınlıkta üretilmiştir. SiC takviye oranları % 3, 7 ve 11 olarak belirlenmiştir. Malzemeler ekstrüzyon yöntemi ile üretilmiş olup sıcaklık (500 ˚C) ve kalıp açısı gibi ekstrüzyon oranları sabit tutulmuştur. Üretilen malzemeler radyal yönde yüklemelere maruz bırakılarak yassıltma testlerine tabi tutulmuşlardır. Test sonuçlarına göre iç katmandaki SiC takviyesi ve takviye oranının artması ile malzemelerin akma dirençleri artmıştır. Bu artış % 11 takviye oranında düşmeye başlamıştır. Aynı şekilde iç cidarın kalınlığının artması ile artan mukavemet iç cidarın en yüksek değerine çıkması ile düşüş göstermiştir. Sünek bir yapıya sahip olan Al6061 malzeme tam yassılmada kırılma hasarı göstermezken artan iç cidar kalınlığı ve SiC oranı ile birlikte malzemelerde hem yanal bölgelerde hem de temas noktalarında kırılmalar oluşmuştur.

Keywords

Çift katmanlı boru, SiC, Ekstrüzyon, Yassıltma testi

Supporting Institution

Erciyes Üniversitesi

Project Number

FYL-2020-10147

Mechanical Properties and Deformation Behavior of Al/Al-SiC Double-Walled Composite Pipes Under Radial Loading

Abstract

Composite materials are produced in different material structures depending on their production purposes. This study aimed to produce a circular profile material with partially preserved deformation capability while increasing its strength properties. The composite material was produced with double walls and the outer wall consisted of Al6061 and the inner wall consisted of Al2124-SiC metal matrix composite. Material variables were the variation of wall thicknesses and SiC reinforcement ratios. The materials were produced in 3 different wall configurations with inner and outer wall thicknesses of 1.5-0.5 mm, 1-1 mm, and 0.5-1.5 mm, respectively. SiC reinforcement ratios were determined as 3, 7, and 11%. The materials were produced by the extrusion method and extrusion variables such as temperature (500 ˚C) and die angle were kept constant. The produced materials were exposed to flattening tests. According to the test results, the flattening resistance of the materials increased with the SiC reinforcement in the inner layer and with the increase in the reinforcement ratio. This increase started to decrease at the 11% reinforcement rate. Likewise, the strength, which increased with the increase in the thickness of the inner wall, decreased as the inner wall reached its highest value. While the Al6061 material, which has a ductile structure, did not show any failure in full flattening, with the increasing inner wall thickness and SiC ratio, failures occurred in double-walled materials both in the lateral regions and at the material-jaw contact points.

Keywords

Double layer pipe, SiC, Extrusion, Flattening test

Project Number

FYL-2020-10147

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