Yulamda, Infimum Deviasi (2023) Analisis Pengaruh Karakteristik Lattice Parameter Terhadap Nilai Poisson’s Ratio Pada 3d Re-Entrant Honeycomb Auxetic Metamaterial Menggunakan Finite Element Method. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Metamaterials adalah material rekayasa yang memiliki sifat-sifat spesifik dan tidak dimiliki pada material konvensional. Sifat ini diperoleh dari desain struktur makro, bukan dari komposisi kimianya. Salah satu perkembangan metamaterial ialah auxetic metamaterial atau material dengan nilai Poisson’s ratio negatif, membuat material ini menjadi membesar saat ditarik dan mengecil saat ditekan. Pada penelitian ini dilakukan analisa mengenai mekanisme deformasi struktur seluler 3D re-entrant honeycomb (3D-RH) serta pengaruh sudut re-entrant θ dan nilai H/L terhadap nilai Poisson’s ratio dan normalized effective modulus saat diberi beban tekan. Hasil simulasi menunjukan terjadi tiga mekanisme deformasi yaitu: (i) peregangan/pemendekan strut, (ii) bending/defleksi dan (iii) rotasi strut. Nilai Poisson’s ratio pada konfigurasi metamaterial yang disimulasikan dipengaruhi oleh konfigurasi geometrinya. Perubahan sudut -re-entrant θ dan H/L mengubah nilai Poisson’s ratio dan normalized effective modulus. Kenaikan sudut ¬re-entrant θ membuat nilai absolut Poisson’s ratio VZY danVYX meningkat, sedangkan nilai absolut Poisson’s ratio VYZ menurun. Keningkatan sudut ¬re-entrant θ juga membuat normalized effective modulus EZ/ES meningkat, namun cenderung tidak berpengaruh terhadap nilai EY/ES. Pada kenaikan H/L, nilai absolut Poisson’s ratio VZY dan VYX menurun, sedangkan nilai absolut Poisson’s ratio VXZ, normalized effective modulus EZ/ES dan EY/ES meningkat.
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Metamaterials are materials that have specific properties that not owned by conventional materials. This property obtained from the design of the macro structure, not from the chemical composition. One of the progress in metamaterials is auxetic metamaterials or materials with a negative Poisson’s ratio, making these materials enlarge when stretched and shrink when compressed. In this study, an analysis was carried out regarding deformation mechanism of the cellular structure of 3D re-entrant honeycomb (3D-RH) and the effect of re-entrant angle θ and H/L values on the Poisson’s ratio and normalized effective modulus when given a compression load. The simulation results show that there are three deformation mechanisms: (i) stretching/compression of struts, (ii) bending/deflection and (iii) strut rotation. The Poisson's ratio value in the simulated metamaterial configuration is affected by the geometric configuration. Changes in the re-entrant angle θ and H/L change the value of the Poisson's ratio and the normalized effective modulus. An increase in re-entrant angle makes the absolute value of the Poisson's ratio VZY and VYX increase while the absolute value of the Poisson’s ratio VYZ will decrease. The increase in re-entrant angle θ also makes the normalized effective modulus of EZ/ES increase, and tends to be flat for EY/ES. With the increase of H/L, the absolute value of the Poisson's ratio VZY and VYX decreases while VXZ, normalized effective modulus EZ/ES and EY/ES increases.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Auxetic Metamaterial, Metode Elemen Hingga, Poisson’s Ratio, 3D Re-entrant Honeycomb, Auxetic Metamaterial, Finite Element Method, Poisson’s Ratio, 3D Re-entrant Honeycomb |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Infimum Deviasi Yulamda |
| Date Deposited: | 09 Feb 2023 03:08 |
| Last Modified: | 09 Feb 2023 03:08 |
| URI: | http://repository.its.ac.id/id/eprint/96314 |
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