Cem BOĞA, Mirsadegh SEYEDZAVVAR, Burçak ZEHİR

3 Boyutlu Basılı PLA Numunelerinin İç Mimarisinin Mekanik Davranışı Üzerindeki Etkilerinin Deneysel İncelenmesi

3D baskı teknolojisi, havacılık endüstrisinde, birçok tıbbi aletin hafif ve karmaşık yapısal modellenmesinde, üretiminde ve prototiplenmesinde kullanılan bir eriyik birikim modelleme (FDM) yöntemidir. Polilaktik asit (PLA), toksik olmaması, biyolojik olarak parçalanabilirliği, endüstriyel tasarımlar ve tıbbi uygulamalar için kolay üretilebilirliği nedeniyle 3D yazıcılarda hammadde olarak kullanılmaktadır. Bu çalışmada PLA numuneleri, 3 boyutlu yazıcıda %70 sabit doluluk oranında dört farklı dolgu tipinde üretildi: line, triangle, hexagon ve 3D infill. Dolgu tipinin mekanik davranışa etkisini incelemek için numuneler üzerinde çekme testleri yapılmıştır. Testlerin ardından numunelerin elastisite modülü, akma gerilmesi, maksimum çekme gerilmesi ve Poisson oranı gibi mekanik özellikleri belirlenmiştir. Sonuçlar, doldurma tipinin FDM yöntemi ile üretilen numunelerin mekanik özellikleri üzerinde önemli bir etkiye sahip olduğunu ortaya koymuştur. Baskı sürecinde, üçgen tip dolgu deseninde imal edilen numunenin en yüksek mukavemet/ağırlık oranını verdiği ve hammadde tüketiminde tasarruf sağladığı görülmüştür.

Anahtar Kelimeler:

Polilaktik asit (PLA), 3D yazıcı, Dolgu türleri, Mekanik Davranış, Çekme testi

Experimental Investigation on the Effects of Internal Architecture on the Mechanical Properties of 3D Printed PLA Components

3D printing technology is a method of fused deposition modeling (FDM) used in the aerospace industry, in light and complex structural modeling, manufacturing and prototyping of many medical tools. Polylactic acid (PLA) is used as a raw material in 3D printers due to its non-toxicity, biodegradability and easy manufacturability for industrial designs and medical applications. In this study, PLA samples were produced on a 3D printer at 70% constant filling ratio in four different filling types: line, triangle, hexagon and 3D infill. Tensile tests were performed on the samples in order to examine the effect of the filling type on the mechanical behavior. After the tests, mechanical properties of the samples such as modulus of elasticity, yield stress, maximum tensile stress and Poisson's ratio were determined. The results revealed that the filling type had significant influence on the mechanical properties of the FDM fabricated samples. It was shown that the triangle type of filling pattern in printing process yielded the highest strength to weight ratio of the fabricated sample and provided savings in raw material consumption.

Keywords:

Polylactic acid (PLA), 3D printer, Filling types, Mechanical behavior, Tensile test,

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