Effect of 3D printing speed on mechanical and thermal properties of wood-PLA composite filament

Abstract

This study was carried out to examine the effect of the change in printing speed on the material properties of printing wood flour-filled filaments on a 3D printer. First, hornbeam wood flour was added to the Polylactic acid (PLA) polymer and then mixed in a twin-screw extruder, and then a wood-PLA composite filament with a diameter of 1.75 mm was produced. Then, test samples were printed from the produced wood-PLA composite filament at different printing speeds (40-50-60 mm/s) using a 3D printer. Tensile strength and hardness tests were performed to determine the mechanical properties of the 3D printed samples. According to the tensile strength test results, the tensile strengths of the 3D printed samples exhibited different values with the change in printing speed. The highest tensile strength value was determined as 23.02 MPa at a printing speed of 50 mm/s, and the lowest tensile strength value was 22.14 MPa at a printing speed of 40 mm/s. According to the Shore D test results, the lowest hardness value was measured as 85.33 at a printing speed of 40 mm/s, and the highest value was measured as 86.1 at a printing speed of 60 mm/s. The crystallinity percentage of PLA first increased and then decreased with the increase in 3D printing speed according to the Differential Scanning Calorimetry (DSC) results. In addition, 3D printing speed did not have much effect on the melting temperatures of PLA.

Keywords

• Wood flour
• composite
• 3D printing speed
• tensile strength
• DSC analysis

3B baskı hızının odun-PLA kompozit filamentin mekanik ve termal özelliklerine etkisi

Abstract

Bu çalışma, odun unu dolgulu filamentlerin 3 boyut (3B) yazıcıda yazdırılmasında, baskı hızındaki değişikliğin malzeme özellikleri üzerindeki etkisini incelenmek amacıyla yapılmıştır. İlk önce gürgen odun unu Polilaktik asit (PLA) polimerine ilave edildikten sonra çift vidalı ekstruderde karıştırılmış ve ardından 1.75 mm çapında odun-PLA kompozit filamenti üretilmiştir. Daha sonra, üretilen odun-PLA kompozit filamentinden 3B yazıcı kullanılarak farklı baskı hızlarında (40-50-60 mm/s) test numuneleri yazdırılmıştır. 3B yazdırılmış numunelerin mekanik özelliklerini belirlemek için çekme mukavemeti ve sertlik testleri yapılmıştır. Çekme mukavemeti testi sonuçlarına göre 3B yazdırılmış örneklerin çekme mukavemetleri baskı hızındaki değişiklik ile farklı değerler sergilemiştir. En yüksek çekme mukavemeti değeri 50 mm/s baskı hızında 23.02 MPa, en düşük çekme mukavemeti değeri ise 40 mm/s baskı hızında 22.14 MPa olarak tespit edilmiştir. Shore D testi sonuçlarına göre en düşük sertlik değeri 40 mm/s baskı hızında 85.33 olarak, en yüksek değer ise 60 mm/s baskı hızında 86.1 olarak ölçülmüştür. Diferaniyel Taramalı Kalorimetre (DSC) sonuçlarına göre 3B baskı hızı artışı ile PLA’nın kristallik yüzdesi önce artmış, sonra azalmıştır. Buna ek olarak, 3B baskı hızının PLA’nın erime sıcaklıklarına çok fazla etkisi olmamıştır.

Keywords

• Odun unu
• kompozit
• 3D baskı hızı
• çekme direnci
• DSC analizi

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