Hat-genişliği parametresinin 3B yazdırılmış PLA parçaların çekme mukavemeti, yüzey profili ve yazdırma süresi üzerindeki etkisi

Abstract

Bu çalışma, hat-genişliği değerlerinin 3B (üç boyutlu) yazdırılmış PLA (polilaktik asit) parçalarının özellikleri üzerindeki etkisini incelemektedir. Parçaların 3B yazdırma, düşük maliyetli kartezyen tip FFF (eriyik filament üretimi) masaüstü 3B yazıcı kullanılarak gerçekleştirildi. PLA parçaları yazdırmak için 0,6 mm çapında pirinç nozul kullanıldı. 0,6 mm ile 1,2 mm arasında hat genişliği değerlerine sahip parçalar basıldı ve hat genişliği değerlerinin mekanik özellikler ve yazdırma süresi üzerindeki etkisi incelendi. 3B yazdırılmış parçaların mekanik özellikleri, çekme test cihazı (Zwick/Roell, Z250) kullanılarak belirlendi. 3B yazdırılmış numunelerin mikro yapıları optik mikroskop (Leica, DM 2500) kullanılarak incelendi. 3D yazdırma işlemi sırasında her parça için yazdırma süresi kaydedildi. Parçaların yüzey profilleri yüzey pürüzlülük test cihazı (Mitutoyo SJ-210) kullanılarak incelendi. Mikroyapısal incelemeler, boşlukların bitişik depozitlenmiş hatlar arasında oluştuğunu ve boşluk içeriğinin 1,0 mm'ye kadar artan hat genişliği değeriyle %5,89'dan %5,13'e düştüğünü gösterdi. Yüzey pürüzlülük parametresi Ra, artan hat genişliğiyle 5.11±0.21 µm’den 9.29±1.12 µm'ye yükseldi. 3B yazdırılmış numunelerin çekme mukavemeti, bitişik u-dönüşü bölümleri arasındaki boşlukların varlığı nedeniyle artan hat genişliğiyle azalma gösterdi. Çekme mukavemeti değerleri, 0,6 mm ve 1,2 mm hat genişliği değerleriyle yazdırılmış numuneler için sırasıyla 58.52±1.93 MPa ve 46.54±1.18 MPa olarak belirlendi. Çekme kırılma yüzeyinin SEM görüntüleri, yazdırılmış numunelerin ana hasar mekanizmasının, hatlar arası bağların kırılması yerine depozitlenmiş hatların kopması olduğunu gösterdi.

Keywords

• 3B yazdırma
• mekanik özellikler
• karakterizasyon

Effect of line-width parameter on the tensile strength, surface profile and printing time of 3D printed PLA parts

Abstract

This study investigates the effect of line-width values on the properties of 3D (three dimensional) printed PLA (polylactic acid) parts. 3D printing of parts was carried out by using low-cost cartesian type FFF (fused filament fabrication) desktop 3D printer. Brass nozzle with a diameter of 0.6 mm was used to print PLA parts. Parts having line-width values of 0.6 mm to 1.2 mm were printed and the effect of line-width values on the mechanical properties and printing time was investigated. Mechanical properties of 3D printed parts were determined by using tensile testing device (Zwick/Roell, Z250). Microstructures of 3D printed samples were investigated by using optical microscope (Leica, DM 2500). Printing time for each part was recorded during 3D printing process. Surface profiles of parts were investigated by using surface roughness tester (Mitutoyo SJ-210). Microstructural investigations showed that the voids were formed between adjacent deposited lines and the void content decreased from 5.89% to 5.13% with increasing line-width value up to 1.0 mm. Surface roughness parameter of Ra increased from 5.11±0.21 µm to 9.29±1.12 µm with increasing line-width. Tensile strength of 3D printed specimens showed a slight decrease with increasing line-width due to the presence of voids between adjacent u-turn sections. The tensile strength values were determined as 58.52±1.93 MPa and 46.54±1.18 MPa for specimens printed with line-width values of 0.6 mm and 1.2 mm respectively. SEM images of tensile fracture surface demonstrated that the main failure mechanism of the printed specimens was the rupture of deposited lines instead of fracture of inter-line bonding.

Keywords

• 3D printing
• mechanical properties
• characterization

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