The Effect of Strut Size Diameter on Physical and Mechanical Properties on Truncated Octahedron Lattice Structure by Fused Filament Fabrication and Investment Casting

Chandra, Ika (2024) The Effect of Strut Size Diameter on Physical and Mechanical Properties on Truncated Octahedron Lattice Structure by Fused Filament Fabrication and Investment Casting. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Material cellular, terutama lattice structure menawarkan pengurangan berat yang signifikan dengan tetap mempertahankan sifat mekanik yang kuat, terutama dalam penyerapan energi. Jenis metal cellular yang memiliki pola geometris berpori dengan simpul dan sambungan yang teratur, memiliki kekuatan mekanik yang tinggi dengan massa yang rendah yang dapat diproduksi melalui metode seperti additive manufacturing yang dikombinasikan dengan investment casting. Dilihat dari sifat-sifatnya, banyak penelitian berfokus pada pengoptimalan struktur ini untuk aplikasi spesifik, seperti produksi aluminum foam, di mana truncated octahedron lattice structure menunjukkan kemampuan penyerapan energi dan distribusi tegangan yang unggul. Variasi dalam geometri berdampak pada sifat mekanik, dengan pertimbangan dimensi strut yang mempengaruhi kekuatan dan kekakuan. Selain itu, aluminium 6061 dipilih untuk penelitian ini karena sifat mekaniknya, termasuk kekuatan tinggi, ketahanan terhadap korosi, dan kemampuan mesin yang baik. Selain itu, beratnya yang relatif ringan menjadikannya bahan yang sangat cocok untuk aplikasi lattice structure di berbagai sektor industri. Penelitian ini menerapkan proses additive manufacturing dalam pembuatan pola PLA yang kemudian dimasukkan ke dalam slurry, yang kemudian dilebur untuk membuat struktur berongga pada cetakan. Variabel dalam penelitian ini adalah diameter strut yang divariasikan dari 4.0 mm, 4.2 mm, dan 4.4 mm. Aluminium 6061 kemudian dilebur pada temperatur 800oC di dalam electric furnace dan dituang ke dalam cetakan yang telah dibuat. Produk yang dihasilkan dari proses investment casting berbantuan additive manufacturing ini selanjutnya diuji dari segi sifat fisik dan mekanisnya. Hasil menunjukan bahwa strut dengan diameter 4.0 mm memiliki persentase tertinggi untuk pengecoran sempurna pada bentuk persegi (94.44%), kekuatan kompresi tertinggi (18 MPa), dan densitas terbaik (4.67 MJ/m3). Hasil tertinggi pada pengujian kekerasan Vickers dimiliki oleh strut dengan diameter 4.2 mm untuk chill zone (49.17 HV5), strut diameter 4.0 pada columnar zone (51.07 HV5) dan equiaxed zone (54.1 HV5).

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Cellular material, especially lattice structure offers significant weight reduction while maintaining robust mechanical properties, especially in energy absorption. This type of cellular metal features a porous geometric pattern with regular vertices and joints, promoting high mechanical strength with low weight that can be produced through methods like additive manufacturing combined with investment casting. From its properties, research focuses on optimizing these structures for specific applications, such as aluminum foam production, where the truncated octahedron lattice pattern demonstrates superior energy absorption and stress distribution capabilities. Variations in geometry impact mechanical properties, with considerations for strut dimensions influencing strength and stiffness. Furthermore, aluminum 6061 was selected for this study due to its advantageous mechanical properties, including high strength, corrosion resistance, and good machinability. Additionally, its relatively low weight makes it an especially suitable material for lattice structure applications across a range of industrial sectors. This research applies the additive manufacturing process in making PLA patterns which subsequently put into slurry mixture, then melted to create a hollow structure in the mold. The variable in this research is the diameter of the strut which variety from 4.0, 4.2, and 4.4 mm. The aluminum 6061 then melted at a temperature of 800oc in the electric furnace and poured into the mold that has been created. The products produced from the additive manufacturing-assisted investment casting process were then tested in terms of physical and mechanical properties. The results show that the strut with a diameter of 4.0 mm has the highest percentage of perfect casting in square shape (94.44%), the highest compression strength (14.852 MPa), and the best density (4.67 MJ/m3). The highest results in the Vickers hardness test belonged to the 4.2 mm diameter strut for the chill zone (49.17 HV5), the 4.0 diameter strut in the columnar zone (51.07 HV5) and equiaxed zone (54.1 HV5).

Item Type:	Thesis (Other)
Uncontrolled Keywords:	3D Printing, Fused Deposition Models, Investment Casting, Lattice Structure, Truncated Octahedron
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA174 Computer-aided design. T Technology > TA Engineering (General). Civil engineering (General) > TA433 Strength of materials. T Technology > TA Engineering (General). Civil engineering (General) > TA 459 Metal foams. T Technology > TA Engineering (General). Civil engineering (General) > TA480.A6 Aluminum alloys. T Technology > TS Manufactures > TS233 Sand casting. Metal castings--Thermal properties.
Divisions:	Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Ika Chandra
Date Deposited:	01 Aug 2024 08:58
Last Modified:	01 Aug 2024 08:58
URI:	http://repository.its.ac.id/id/eprint/111757

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