Investigation of the Effect of Infill Parameters on the Mechanical Behavior of Sandwich Structures Fabricated via Fused Deposition Modeling (FDM)

Abstract

This study focuses on the investigation of infill patterns and their influence on the mechanical behavior of sandwich structures fabricated using the Fused Deposition Modeling (FDM) technique. Polylactic Acid (PLA) was chosen as the primary material, known for its favorable mechanical properties and biodegradability. Six different infill patterns, including Cubic, Line, Triangular, Trihexagonal, Octet, and Gyroid, were employed to fabricate sandwich structures with varying infill densities (20%, 30%, and 40%). The samples were subjected to edgewise compressive strength tests, and the force-displacement curves were analyzed to evaluate the performance of the structures. The results revealed that the Cubic infill pattern exhibited superior strength in all infill densities, while other patterns showed variations in performance. Moreover, the analysis of damage types indicated different failure modes, such as core shear and facesheet buckling, depending on the infill pattern and density. These findings contribute to understanding the role of infill patterns in enhancing the mechanical properties of sandwich structures fabricated via FDM.

Keywords

• Additive Maufacturing
• Sandwich Structures
• Infill patterns
• Infill Density

Tel Eritmeli İlkörnekleme (FDM) ile Üretilen Sandviç Yapıların Mekanik Davranışı Üzerinde Dolgu Parametrelerinin Etkisinin İncelenmesi

Öz

Bu çalışma, Fused Deposition Modeling (FDM) tekniği kullanılarak üretilen sandviç yapıların mekanik davranışı üzerinde dolgu desenlerinin etkisini incelemektedir. Polilaktik Asit (PLA), tercih edilen birincil malzeme olarak seçilmiştir ve mekanik özellikleri ile biyolojik olarak çözünebilir olmasıyla bilinmektedir. Cubic, Line, Triangular, Trihexagonal, Octet ve Gyroid olmak üzere altı farklı dolgu deseni, farklı dolgu yoğunlukları (20%, 30% ve 40%) ile birlikte kullanılarak sandviç yapılar üretilmiştir. Numuneler, kenar yönde basınç dayanım testlerine tabi tutulmuş ve kuvvet-deplasman eğrileri yapıların performansını değerlendirmek için analiz edilmiştir. Sonuçlar, Cubic dolgu deseninin tüm dolgu yoğunluklarında üstün mukavemet sergilediğini, diğer desenlerin performansta farklılıklar gösterdiğini ortaya koymuştur. Ayrıca, hasar tiplerinin analizi, dolgu deseni ve yoğunluğuna bağlı olarak çekirdek kayması ve yüzey plakasının burkulması gibi farklı hata modlarını göstermiştir. Bu bulgular, FDM ile üretilen sandviç yapıların mekanik özelliklerini artırmada dolgu desenlerinin rolünü anlamamıza katkı sağlamaktadır.

Anahtar Kelimeler

• Eklemeli imalat
• Sandviç yapılar
• Dolgu deseni
• Dolgu yoğunluğu

Kaynakça

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