Raharjo, Slamet (2024) Analisis Pengaruh Karakteristik Lattice Parameter Dan Bahan Terhadap Nilai Poisson’s Ratio Pada Anti-Tetrachiral Metamaterial Untuk Desain Stent Menggunakan Metode Elemen Hingga. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Metamaterial merupakan material buatan yang direkayasa untuk mendapatkan sifat-sifat yang tidak ditemukan pada material konvensionalnya. Metamaterial ditentukan dari strukturnya daripada komposisi bahan penyusunnya. Metamaterial memiliki keunggulan sifat auxeticity dengan negative poisson’s ratio. Metamaterial dimanfaatkan dalam aplikasi stent untuk dapat menutupi kekurangan stent akibat kegagalan mekanis. Dalam penelitian ini membahas pengaruh variasi parameter struktur pada Anti-Tetrachiral Metamaterial dengan melakukan simulasi uji tekan uniaksial dengan beban sebesar 2 newton pada arah sumbu-y negatif dengan diamati pengaruh dari variasi jari-jari simpul (r), panjang ligamen (l), dan ketebalan (t) dari unit sel terhadap nilai poisson’s ratio. Selain itu, penelitian ini juga akan membahas pengaruh variasi bahan penyusun dari struktur stent yang memanfaatkan struktur Anti-Tetrachiral sebagai pattern strukturnya dengan dilakukan simulasi aplikasi stent pada trakea dengan pressure 0,007 MPa. Didapatkan hasil simulasi bahwa struktur Anti-Tetrachiral Metamaterials bernilai negatif dikarenakan respon gerakan deformasi rotasi silinder simpul akibat torsi yang memberikan momen pada ligamen hingga menekuk. Panjang ligamen mempengaruhi Poisson’s Ratio sebesar 1% , semakin panjang ligamen maka semakin kecil nilai Poisson’s Ratio (mendekati -1). Jari-jari simpul juga mempengaruhi Poisson’s Ratio sebesar 3%, semakin besar jari-jari simpul maka semakin besar nilai Poisson’s Ratio (menjauhi -1). Serta ketebalan strut mempengaruhi Poisson’s Ratio sebesar 15%, semakin tebal strut maka semakin besar nilai Poisson’s Ratio (menjauhi -1). Pada penelitian ini didapatkan lattice parameter terbaik pada desain 7 (l: 6mm, r: 1mm dan t: 0,1mm) dengan Poisson’s Ratio sebesar -0,703. Penggunaan material pada aplikasi stent dengan pattern Anti-Tetrachiral desain 7 mempengaruhi sifat mekanik stent yang disebabkan oleh sifat mechanical properties dari raw material. Berdasarkan hasil simulasi yang telah dilakukan material Stainless Steel 316L merupakan pilihan terbaik dengan energy absorption dan radial stiffness yang paling besar serta memenuhi syarat safety factor dan non-foreshortening (foreshortening memiliki nilai 0,142 %).
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Metamaterials are artificial materials that are engineered to obtain properties not found in their conventional counterparts. Metamaterials are defined by their structure rather than their composition. Metamaterials have the advantage of auxeticity with a negative Poisson's ratio. Metamaterials are utilized in stent applications to be able to cover stent deficiencies due to mechanical failure. This research discusses the effect of structural parameter variations on Anti-Tetrachiral Metamaterial by simulating a uniaxial compressive test with a load of 2 newtons in the negative y-axis direction by observing the effect of variations in node radius (r), ligament length (l), and thickness (t) of the unit cell on the poisson's ratio value. In addition, this study will also discuss the effect of variations in the constituent materials of the stent structure that utilizes the Anti-Tetrachiral structure as its structural pattern by simulating the application of the stent in the trachea with a pressure of 0.007 MPa. The simulation results showed that the Anti-Tetrachiral Metamaterials structure has a negative value due to the response of the rotational deformation movement of the cylinder node due to the torque that gives the ligament a moment to bend. The length of the ligament affects the Poisson's ratio by 1%, the longer the ligament, the smaller the Poisson's ratio value (closer to -1). The node radius also affects the Poisson's ratio by 3%, the larger the node radius, the greater the Poisson's ratio value (away from -1). And strut thickness affects Poisson's ratio by 15%; the thicker the strut, the greater the value of Poisson's ratio (away from -1). In this study, the best lattice parameters were obtained in design 7 (l: 6mm, r: 1 mm, and t: 0.1mm) with a Poisson's ratio of -0.703. The use of materials in the application of stents with anti-tetrachiral pattern design 7 affects the mechanical properties of stents, which are caused by the mechanical properties of raw materials. Based on the results of the simulations that have been carried out, Stainless steel 316L is the best choice with the greatest energy absorption and radial stiffness and meets the requirements of the safety factor and non-foreshortening (foreshortening has a value of 0.142%).
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Metamaterial Anti-Tetrachiral, Poisson’s Ratio, Stent, Metode Elemen Hingga, Anti-Tetrachiral Metamaterial, Finite Element Method |
| Subjects: | T Technology > T Technology (General) > T57.62 Simulation T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 27101-(S2) Master Thesis |
| Depositing User: | Slamet Raharjo |
| Date Deposited: | 06 Feb 2024 07:15 |
| Last Modified: | 07 Feb 2024 04:00 |
| URI: | http://repository.its.ac.id/id/eprint/106278 |
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