Pengaruh Susunan Hybrid Tubular Pla Auxetic Anti-Tetrachiral - Aluminium Sheet Crashbox terhadap Kinerja Crashworthiness

Tono, Ahmad Hashfi Izdiharuddin (2025) Pengaruh Susunan Hybrid Tubular Pla Auxetic Anti-Tetrachiral - Aluminium Sheet Crashbox terhadap Kinerja Crashworthiness. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Crashbox merupakan komponen yang berfungsi sebagai sistem keamanan pasif untuk mengurangi tingkat kerusakan saat terjadi benturan. Dalam aplikasinya, crashbox akan menyerap energi yang besar melalui deformasi plastis ketika terjadi tabrakan sehingga mengurangi kerusakan komponen yang dilindungi oleh crashbox. Penelitian sebelumnya menunjukkan bahwa kombinasi auxetic polymer dan aluminium sheet pada desain hybrid crashbox memiliki potensi peningkatan kinerja. Namun, konfigurasi penyusunan komponen hybrid tersebut masih terbatas dan menyisakan peluang penelitian lebih lanjut. Penelitian ini bertujuan untuk memperoleh susunan dari hybrid tubular crahsbox yang menghasilkan kinerja crashworthiness terbaik. Spesimen hibrida yang diuji menggunakan dua konfigurasi berbeda, yaitu aluminium sheet di bagian luar dan aluminium sheet di bagian dalam tube auxetic anti-tetrachiral. Pengujian dilakukan menggunakan metode displacement-controlled quasi-static compression dengan penekanan secara aksial pada spesimen. Data hasil pengujian akan diolah menjadi grafik load-displacement kemudian dianalisis untuk memperoleh nilai initial peak force (IPF), specific energy absorption (SEA), mean crushing force (MCF), dan crushing force efficiency (CFE) sebagai parameter kinerja crashworthiness. Nilai tersebut menjadi pembanding dalam mencari konfigurasi dengan kinerja crashworthiness paling baik. Hasil pengujian menunjukkan peningkatan crashworthiness yang signifikan terhadap baseline penyusunnya, di mana spesimen AL-AT dan AT-AL memperoleh peningkatan yang signifikan pada nilai IPF, EA, dan MCF. Hal ini dikarenakan faktor dari perbedaan susunan serta pengeleman pada interface kedua. Namun, untuk SEA dari AL-AT dan AT-AL memiliki nilai lebih rendah dibandingkan aluminium sheet dikarenakan massa baseline aluminium sheet lebih ringan daripada spesimen hybrid. Nilai CFE pada masing-masing spesimen menunjukkan kestabilan penyerapan energi selama deformasi. Siginifikansi perbedaan antara spesimen hybrid AL-AT dengan AT-AL diuji secara statistik. Hasil menunjukkan tidak terdapat cukup bukti untuk menolak hipotesis nol dikarenakan standar deviasi yang terlalu besar dan ukuran sampel yang kecil sehingga perbedaan antar spesimen tidak signifikan secara statistik. Menilai dari prioritas kinerja crashworthiness yaitu SEA dan IPF maka spesimen AL-AT lebih unggul dibandingkan spesimen AL-AT. Penelitian ini diharapkan memberikan pengembangan baru opsi desain crashbox untuk meningkatkan crashworthiness sehingga dapat memberikan implikasi pada peningkatan keselamatan komponen penting saat terjadi benturan.
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Crashbox is a component that functions as a passive safety system to reduce the level of damage during a collision. In its application, the crashbox absorbs a large amount of energy through plastic deformation during impact, thereby minimizing damage to the components it protects. Previous studies have shown that a hybrid crashbox design combining auxetic polymer and aluminum sheet has the potential to enhance performance. However, the configuration of the hybrid component arrangement remains limited, leaving opportunities for further research. This study aims to determine the arrangement of a hybrid tubular crashbox that yields the best crashworthiness performance. The hybrid specimens tested used two different configurations: one with the aluminum sheet on the outside and another with the aluminum sheet on the inside of the auxetic anti-tetrachiral tube. Testing was conducted using a displacement-controlled quasi-static compression method by applying axial pressure to the specimen. The test data was processed into load-displacement graphs and analyzed to obtain the values of initial peak force (IPF), specific energy absorption (SEA), mean crushing force (MCF), and crushing force efficiency (CFE) as crashworthiness performance parameters. These values were used as a comparison to determine the configuration with the best crashworthiness performance. The test results showed a significant improvement in crashworthiness compared to the baseline components, with the AL-AT and AT-AL specimens demonstrating notable increases in IPF, EA, and MCF. This improvement is attributed to differences in configuration and the bonding at the interface between the components. However, the SEA values of AL-AT and AT-AL were lower than that of the aluminum sheet alone due to the lighter mass of the baseline aluminum sheet compared to the hybrid specimens. The CFE values of each specimen indicated stable energy absorption during deformation. The statistical significance of the difference between the AL-AT and AT-AL hybrid specimens was tested. The results showed insufficient evidence to reject the null hypothesis due to the large standard deviation and small sample size, indicating that the difference between specimens was not statistically significant. Considering the priority crashworthiness performance indicators, namely SEA and IPF, the AL-AT specimen outperformed the AT-AL specimen. This study is expected to provide a novel development in crashbox design options to enhance crashworthiness, thereby contributing to the safety of critical components during impact.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Aluminum Sheet, Auxetic, Crashbox, Crashworthiness, Hybrid tubular
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL257.5 Automobiles--Shock absorbers--Design and construction.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Ahmad Hashfi Izdiharuddin
Date Deposited:	04 Aug 2025 05:29
Last Modified:	04 Aug 2025 05:29
URI:	http://repository.its.ac.id/id/eprint/126833

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