Karakterisasi Lattice Structures Truncated Octahedron Aluminium 7075 Hasil Modified Investment Casting

Wicaksono, Andika Akbar (2025) Karakterisasi Lattice Structures Truncated Octahedron Aluminium 7075 Hasil Modified Investment Casting. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Metallic Cellular Materials (MCMs) memiliki beberapa keunggulan yang dihasilkan dari sifat gabungan logam dan bentuk strukturnya, sehingga banyak diaplikasikan dalam industri manufaktur. Logam memberikan sifat ketangguhan dan kekuatan yang baik, sedangkan struktur material seluler berupa lattice structures membuat strukturnya lebih ringan. Salah satu metode pembuatan lattice structures adalah menggunakan metode investment casting. Akan tetapi, metode ini memiliki beberapa kekurangan, seperti kompleksibilitas dan ukuran yang terbatas, sehingga perlu dikombinasikan dengan metode lain dalam pembuatan patternnya, salah satunya menggunakan metode Fused Filament Fabrication (FFF). FFF dipilih karena memiliki kompleksibilitas dan dapat membentuk pattern dengan ukuran kecil. Penelitian ini bertujuan untuk menerapkan proses FFF dalam pembuatan lattice structures truncated octahedron, serta menganalisis pengaruh diameter strut (4,6 mm, 4,8 mm, 5,0 mm) terhadap karakterisitik dan nilai kekerasan lattice structures truncated octahedron aluminium 7075 hasil modified investment casting. Terdapat beberapa prosedur yang dilakukan, yaitu pembuatan desain 3D menggunakan software Fusion 360, pencetakan pattern menggunakan 3D printing FFF, pembuatan mold, dan pengecoran logam dengan 2 metode investment casting, yaitu investment casting konvensional dan investment casting modified with vacuum pump. Hasil menunjukkan bahwa semua variasi diameter strut dapat difabrikasi menggunakan 3D printing FFF dengan adanya defect gaps, curling, banding, dan stringing. Kemudian, hasil fabrikasi lattice strustures truncated octahedron menunjukkan hanya pada diameter strut 5,0 mm metode investment casting modified with vacuum pump didapatkan persentase terbentuknya lattice mencapai 100% dengan defect berupa drops, shrinkage, cuts and washes, dan flash. Hasil SEM menunjukkan spesimen hasil investment casting konvensional memiliki porositas lebih banyak daripada hasil investment casting modified with vacuum pump. Hasil pengukuran ukuran butir menunjukkan semakin besar diameter strut, ukuran butirnya semakin besar. Hasil pengujian kekerasan Vickers menunjukkan semakin besar diameter strut, nilai kekerasannya semakin kecil.
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Metallic Cellular Materials (MCMs) have several advantages resulting from the combined properties of metals and their structural forms, so they are widely applied in the manufacturing industry. Metals provide good toughness and strength properties, while the cellular material structure in the form of lattice structures makes the structure lighter. One method of making lattice structures is using the investment casting method. However, this method has several drawbacks, such as limited flexibility and size, so it needs to be combined with other methods in making the pattern, one of which is using the Fused Filament Fabrication (FFF) method. FFF was chosen because it has flexibility and can form patterns with small sizes. This study aims to apply the FFF process in the manufacture of truncated octahedron lattice structures, and analyze the effect of strut diameter (4.6 mm, 4.8 mm, 5.0 mm) on the characteristics and hardness values of aluminum 7075 truncated octahedron lattice structures resulting from modified investment casting. There are several procedures carried out, namely making 3D designs using Fusion 360 software, printing patterns using 3D printing FFF, making molds, and casting metal with 2 investment casting methods, namely conventional investment casting and investment casting modified with vacuum pump. The results show that all strut diameter variations can be fabricated using 3D printing FFF with defects of gaps, curling, banding, and stringing. Then, the results of the fabrication of truncated octahedron lattice strustures show that only at a strut diameter of 5.0 mm using the investment casting modified with vacuum pump method, the percentage of lattice formation reaches 100% with defects in the form of drops, shrinkage, cuts and washes, and flash. SEM results show that conventional investment casting specimens have more porosity than the results of investment casting modified with vacuum pump. The grain size measurement results show that the larger the strut diameter, the larger the grain size. The Vickers hardness test results show that the larger the strut diameter, the smaller the hardness value.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Aluminum 7075, Fused Filament Fabrication, Investment Casting, Lattice Structures, Truncated Octahedron, Aluminium 7075
Subjects:	T Technology > TN Mining engineering. Metallurgy > TN775 Aluminum alloys--Metallurgy. T Technology > TS Manufactures > TS233 Sand casting. Metal castings--Thermal properties.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Andika Akbar Wicaksono
Date Deposited:	17 Jan 2025 06:49
Last Modified:	17 Jan 2025 06:49
URI:	http://repository.its.ac.id/id/eprint/116373

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