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Journals / Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi / 2022 / Cilt: 38 Sayı: 1

Investigation on mechanical performances of various cellular structures produced by fused deposition modeling (FDM) method

Eriyik yığma modelleme (EYM) ile üretilen çeşitli hücresel yapıların mekanik performanslarının incelenmesi

Berkay Ergene(PAMUKKALE UNIVERSITY)0000-0001-6145-1970
Bekir Yalçın(AFYON KOCATEPE UNIVERSITY, FACULTY OF TECHNOLOGY, DEPARTMENT OF MECHANICAL ENGINEERING, MECHANICAL ENGINEERING PR.)0000-0002-3784-7251
Pages
201–218
Publication Date
2022-06-21
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

According to the results, it was determined that the direction and rib thickness of the unit cells in cellular structures significantly affect the mechanical performance of the cellular structures.

📌 3 Key Takeaways

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Objective & Hypothesis:In this study, honeycomb structure with positive Poisson ratio (PO), re-entrant structure with negative PO, hybrid structure which is a combination of honeycomb and re-entrant structure and finally chiral structures were produced from PLA material by fused deposition modelling (FDM).
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Key Findings & Data:Then, the effects of rib thickness and direction of the unit cell on the mechanical performances of these cellular structures were investigated experimentally in tension and compression conditions.
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Conclusion & Impact:According to the results, it was determined that the direction and rib thickness of the unit cells in cellular structures significantly affect the mechanical performance of the cellular structures.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:Eriyik yığarak modelleme · balpeteği · re-entrant

Abstract

In this study, honeycomb structure with positive Poisson ratio (PO), re-entrant structure with negative PO, hybrid structure which is a combination of honeycomb and re-entrant structure and finally chiral structures were produced from PLA material by fused deposition modelling (FDM). Then, the effects of rib thickness and direction of the unit cell on the mechanical performances of these cellular structures were investigated experimentally in tension and compression conditions. As a result of tension and compression tests of cellular structured which are manufactured by FDM method, their elasticity modulus (EM), tensile strength (TS), compression strength (CS), absorbed energy (AE) and specific absorbed energy (SAE) were determined besides their Poisson ratios (PR). In addition to these findings obtained via mechanical tests, the hardness values and surface roughness values of the produced cellular structured samples were also measured. According to the results, it was determined that the direction and rib thickness of the unit cells in cellular structures significantly affect the mechanical performance of the cellular structures. While the TS and CS of the cellular structures increase with increasing rib thickness, the surface roughness and hardness values were measured as 14 µm and 75 Shore D, respectively. Although negative PO was observed in re-entrant, chiral and hybrid structures depending on the amount of deformation, positive PO was observed in honeycomb structures as expected. B thickness 0.5 mm and unit cells of the honeycomb structure (Hy 0.5) and the re-entrant structure (Ry 0.5) facing the y direction have the maximum AE and SAE values in tension and compression conditions, respectively. In addition, honeycomb structure and re-entrant structure have rib thickness of 0,5 mm and unit cells on y direction (Hy 0,5 and Ry 0,5) presents maximum AE and SAE values in order of tension and compression cases.

Özet

Bu çalışmada eriyik yığarak modelleme metoduyla PLA malzemeden pozitif Poisson oranına (PO) sahip bal peteği yapı, negatif PO’na sahip re-entrant yapı, balpeteği ve re-entrant yapının bir kombinasyonu olan hibrit yapı ve son olarak da kiral yapılar üretilmiştir. Daha sonra, bu hücresel yapılarda kiriş kalınlığının ve birim hücrenin yönünün mekanik performanslarına etkisi çekme ve basma durumunda deneysel olarak incelenmiştir. EYM metoduyla üretilen hücresel yapıların çekme ve basma testleri sonucunda elastisite modül (EM) değerleri, çekme dayanımı (ÇD), basma dayanımı (BD), absorbe ettikleri enerji (AEE) ve spesifik absorbe ettikleri enerji (SAEE) miktarlarının yanı sıra Poisson oranları da tespit edilmiştir. Ayrıca, mekanik testler aracılığı ile elde edilen bu bulguların dışında, üretilmiş hücresel yapılı numunelerin sertlik değerleri ve yüzey pürüzlülük değerleri de ölçülmüştür. Elde edilen sonuçlara göre, hücresel yapılardaki birim hücrelerin yönünün ve kiriş kalınlıklarının hücresel yapıların mekanik performansını önemli düzeyde etkilediği tespit edilmiştir. Hücresel yapıların ÇD ve BD’ları artan kiriş kalınlığı ile birlikte artış gösterirken, yüzey pürüzlülük ve sertlik değerleri sırasıyla ortalama 14 µm ve 75 Shore D olarak ölçülmüştür. Re-entrant, kiral ve hibrit yapıda deformasyon miktarına bağlı olarak negatif PO gözlemlenmesine rağmen, balpeteği yapılarda beklendiği üzere pozitif PO görülmüştür. Ayrıca, çekme ve basma durumunda sırasıyla kiriş kalınlığı 0,5 mm ve birim hücreleri y yönüne bakan balpeteği yapı (Hy 0,5) ve re-entrant yapı (Ry 0,5) maksimum AEE ve SAEE sergilemektedirler.

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Cite This Article

Ergene, B., Yalçın, B. (2022). Investigation on mechanical performances of various cellular structures produced by fused deposition modeling (FDM) method. Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi, Cilt: 38 Sayı: 1, 201–218. https://doi.org/10.17341/gazimmfd.945650

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