3D Baskılı Sürekli Karbon Fiber / Polipropilen Kafes Çekirdekli Kompozit Sandviç Yapının Mekanik Özellikleri

Yıl 2024, Cilt: 29 Sayı: 3, 863 - 880

İbrahim Kürşad Türkoğlu , Tolgahan Bayram , Murat Yazıcı

https://doi.org/10.17482/uumfd.1497273

Öz

3Boyutlu üretim teknikleriyle fonksiyonel parçaların üretimi üzerine ilgi çekici çalışmalar ortaya konmaya başlamıştır. Başlangıçta sadece termoplastik filamentler kullanılmasına rağmen gelişen teknolojiler sayesinde elyaf takviyeli kompozit parçalar da üretilebilmektedir. Bu çalışmada, 3Boyutlu baskılama ile üretilmiş sürekli karbon elyaf takviyeli (CFR) kompozit sandviç panellerin yarı-statik ve dinamik yüklemeler altındaki mekanik performansı deneysel olarak incelenmiştir. Sandviç paneller, CFR kompozit yüzey levhaları arasında prizmatik kafes çekirdek olacak şekilde tasarlanmıştır. Sandviç yapıları üretmek için sürekli CFR termoplastik (polipropilen (PP)) monofilament kompozitler (CCTMC) kullanılmıştır. CCTMC sandviç yapıları, özel olarak tasarlanmış bir kalıp içeren laboratuvar ölçekli bir termoplastik ekstrüder sistemi ile üretilmiştir. Sandviçlerin yüzey levhaları, aynı CCTMC'ler kullanılarak üç katman halinde [0°/90°/0°] istifleme sırasına göre sıcak sıkıştırma kalıbında üretilmiştir. Geliştirilen sandviç paneller tamamen geri dönüştürülebilir ve ultra hafiftir ve piramit şeklindeki kafes tipi kafes çekirdekleri sandviç yapının çekirdeği olarak yerleştirilmiştir. Test sonuçları; test numunelerinin basınç testinde 270 kN maksimum kuvvetine ve 3 nokta eğilme testinde de 240 kN maksimum kuvvetine dayanabildiğini göstermiş ve yapıdaki deformasyonun mono kompozit elemanın burkulma sınırına ulaşmasıyla meydana geldiğini ortaya koymuştur. Dinamik 3 nokta eğilme testinde, malzemenin deformasyon hızına bağımlılığı nedeniyle tepe kuvvet değeri yaklaşık 2 kat artarak 450 kN değerine ulaşmıştır.

Anahtar Kelimeler

Eklemeli Üretim, Kompozit Malzemeler, Kafes Çekirdek Yapılar, Mekanik Özellikler, Sandviç Yapılar

MECHANICAL PROPERTIES OF 3D PRINTED CONTINUOUS CARBON FIBER/ POLYPROPYLENE LATTICE CORE COMPOSITE SANDWICH STRUCTURE

Öz

The production of functional parts with 3D manufacturing techniques has started to disclose fascinating studies. Although only thermoplastic filaments were initially used, fiber-reinforced composite parts can be produced using developing techniques. This study investigated the quasi-static and dynamic mechanical performance of 3D printed continuous Carbon Fiber Reinforced (CFR) composite sandwich panels. Sandwich panels were designed with a prismatic lattice core between CFR composite facesheets. Continuous CFR Thermoplastic (Polypropylene (PP)) Monofilament Composites (CCTMC) were used to produce sandwich structures. CCTMC sandwiches were produced with a laboratory-scale production system, including thermoplastic extruder and mold designed specifically. Facesheets of sandwiches were manufactured in a hot compression mold as [0°/90°/0°] stacking sequence as three-layers using the same CCTMCs. The sandwich panels were fully recyclable and ultra-lightweight, and pyramidal-shaped truss-type lattice cores were placed as the core of the structure. Test results showed test specimens had stand ~270 kN peak force in the compression test and ~240 kN peak force in 3-point bending, and the deformation in the structure occurred when the mono composite element reached the buckling limit. In the dynamic 3- point bending, the peak force value increased approximately 2 times and reached 450 kN due to the strain-rate dependence of the material.

Anahtar Kelimeler

Additive Manufacturing, Composite Materials, Lattice Core Structures, Mechanical Properties, Sandwich Structures

Destekleyen Kurum

The authors would like to present their thanks to the Scientific and Technological Research Council of Turkey (TÜBİTAK) for their support through Project Number 118M571.

Teşekkür

The authors also would like to thank Pega Automotive /Turkey for their support for compression and tensile experiments.

Kaynakça

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