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All Journal Warta Ardhia : Jurnal Perhubungan Udara Mesin Prosiding SNTTM
Annisa Jusuf, Annisa
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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The Influence of Forming Effects on The Bending Crush Behavior of Top-Hat Thin–Walled Beams Santosa, Sigit Puji; Nhat Vu, Nguyen Van; Gunawan, Leonardo; Jusuf, Annisa
Mesin Vol 25, No 2 (2016)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (618.036 KB)

Abstract

This paper presents a study on the effects of forming process of a top–hat thin–walled beams to its bending crush resistance under dynamic bending load. The thin–walled beam was formed using a one step deep drawing. HyperForm software simulated the forming process and mapped its effects such as thickness variations and residual plastic strains in to the crash analysis models. Then the dynamic bending crush analysis was carried out using LS–DYNA by using the geometry and materials data obtained from the forming analysis results. For each material model, the analyses were carried out for model with and without the forming effects. The bending crush behavior of the top–hat thin–walled beams were then analyzed to compare between the simulations with and without forming effects. The results show that by incorporating the effect of forming process, the bending crush resistance of the thin–walled  beams is increase by 4.7%. The introduction of strain rates to the material model increases even further on the bending crush resistance of the thin–walled  beam.
Karakterisasi Sifat Mekanik Mild Steel St37 dan High Strength Steel CR420LA pada Laju Regangan Menengah Gunawan, Leonardo; Dimas, Agustinus; Jusuf, Annisa; Dirgantara, Tatacipta; Putra, Ichsan Setya
Mesin Vol 25, No 2 (2016)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (681.695 KB)

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Untuk mendapatkan prediksi respon yang cukup akurat dalam analisis tabrakan kendaraan darat, dimana terjadi pembebanan dan deformasi struktur dalam waktu yang cepat, diperlukan data sifat mekanik material pada berbagai laju regangan. Makalah ini menyajikan pengukuran sifat mekanik Mild Steel St37 dan High Strength Steel CR420LA pada kondisi kuasi-statik dengan laju regangan 0.001 s-1 dan pada kondisi dinamik dengan laju regangan 0.1 s-1, 1 s-1, 10 s-1, dan 100 s-1. Dalam pengujian, data beban terhadap waktu direkam menggunakan load cell, sedangkan data perpindahan terhadap waktu diperoleh menggunakan ekstensometer untuk uji kuasi-statik dan menggunakan kamera kecepatan tinggi diikuti dengan perhitungan regangan berdasarkan metode Korelasi Citra Digital (KCD) untuk kondisi dinamik. Hasil pengukuran menunjukan bahwa baja St37 dan CR420LA termasuk ke dalam jenis material yang sensitif terhadap laju regangan, dimana tegangan luluh material meningkat dengan naiknya laju regangan pada material.
The Influence of Sheet Metal Forming on The Axial Crushing Analysis of Top–Hat Columns Santosa, Sigit P; Tam, Le Hoai; Gunawan, Leonardo; Jusuf, Annisa
Mesin Vol 25, No 1 (2016)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (889.555 KB) | DOI: 10.5614/MESIN.2016.25.1.4

Abstract

Reducing the rate of casualty in the crash events is always on the top priority of car manufacturers and customers. It is therefore necessary to make accurate predictions of car structural behavior during the crash events. To achieve this goal, the axial crushing behavior of the thin-walled top hat column needs to be understood thoroughly so that the crashworthiness performance of the column can be predicted accurately. The effect of sheet metal forming should be considered since many car crashworthiness components are fabricated by sheet metal forming. This paper presents a numerical study to investigate sheet metal forming effects such as: thickness distribution, residual stress and plastic strain change to the crushing force characteristics of the top-hat columns. First, the design of the top-hat column was generated by using deep drawing forming process simulation. Then, the forming parameters (geometry, residual stress, plastic strain, thickness distribution) were transferred to the non-linear finite element dynamic analysis model. The axial crushing simulations for the top-hat column with forming parameters were then performed and analyzed. The results showed that the sheet metal forming has a considerable effect on the crush behavior and performance of the thin-walled top-hat columns.
Optimizing crash box design for enhanced vehicle safety: A Gaussian process regression approach Jarwadi, Maulana Hayu; Jusuf, Annisa; Palar, Pramudita Satria; Gunawan, Leonardo
Prosiding SNTTM Vol 21 No 1 (2023): SNTTM XXI Oktober 2023
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/pqbt8a56

Abstract

Transportation is a fundamental human need that permits mobility, allowing for economic, social, and cultural advancements. The crash box structure, a vital component for crashworthiness, is designed to deform during car collisions to absorb considerable impact energy plastically. This design concept attempts to prevent potential injuries to drivers and passengers. Crash boxes are constantly being developed to optimize their configuration to match needed crashworthiness features. The mean crushing force (Pm), crushing force efficiency (CFE), and specific energy absorption (SEA) are the critical crashworthiness variables that are calculated. With the advancement of data modeling tools, better crash box design can be achieved by revealing recognizable patterns and trends inherent in the data. To that end, this research uses LS-DYNA software to perform a numerical simulation of a hexagonally designed crash box that impacted under axial loading. The simulation includes the variation of thickness and perimeter of the crash box. Following the simulation, the data is modeled using the Gaussian Process Regression (GPR), often known as Kriging. This modeling approach yields surface and contour plots that show the impacts of thickness and perimeter on crashworthiness performance. The results show that the Pm value increases as the structure's thickness and perimeter increase. In comparison, the SEA and CFE values increase when the structure's thickness increases while the perimeter decreases. In summary, the simulation results show that the crash box with a thickness of 3 mm and a perimeter of 400 mm has the highest Pm value. In contrast, the crash box with a thickness of 3 mm and a perimeter of 120 mm achieves the highest CFE and SEA values.
Analisis Perkiraan Umur Struktur Center Wing Box pada Pesawat Hercules C-130H Akibat Beban Lelah Aziz, Ali; Jusuf, Annisa; Rahardjo, Bambang; Putra, Ichsan Setya; Setiawan, Hery; Sugiono, Achmad
WARTA ARDHIA Vol. 48 No. 1 (2022)
Publisher : Sekretariat Badan Kebijakan Transportasi, Kementerian Perhubungan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25104/wa.v48i1.442.43-52

Abstract

Failure of aircraft structural components has fatal consequences, namely the plane crash and will cause loss of life. There are many types of failures in aircraft structures, one of which is fatigue failure, which is often the leading cause of aircraft structural failures. Therefore, this study will determine the age of the center wing box (CWB) structure on the Hercules C-130H aircraft for the case of multiple-site damage crack propagation in the lower skin when experiencing fatigue loads. This research will be divided into four stages of analysis. The first stage is to determine the aerodynamic load received by the wing. Then followed by the second stage is to determine the stress distribution on the CWB structure using finite element analysis. Next, the third stage, namely making a stress spectrum based on the aircraft's flight history and analyzing crack propagation in the fourth stage. The analysis found that the maximum age of the CWB structure was 27,065 flight times or 50,070 flight hours. The age of the structure as a result of this analysis is of higher value than the statement by the aircraft manufacturing company, which is 40,000 flight hours.Kegagalan komponen struktur pesawat terbang memiliki konsekuensi yang sangat fatal, yakni kecelakaan pesawat tersebut dan akan menyebabkan hilangnya nyawa. Banyak jenis kegagalan pada struktur pesawat yang mempengaruhi keselamatan transportasi udara, salah satunya adalah kegagalan lelah (fatigue), yang seringkali merupakan penyebab utama terjadinya kegagalan struktur pesawat. Oleh karena itu, pada penelitian ini akan dilakukan penentuan umur dari struktur center wing box (CWB) pada pesawat Hercules C-130H untuk kasus perambatan retak jenis multiple-site damage di skin bawah ketika mengalami beban lelah. Penelitian ini akan terbagi menjadi empat tahap analisis. Tahap pertama adalah menentukan beban aerodinamik yang diterima sayap, kemudian tahap kedua menentukan distribusi tegangan pada struktur CWB menggunakan analisis elemen hingga. Dilanjutkan dengan tahap ketiga yaitu membuat stress spectrum berdasarkan riwayat penerbangan pesawat, dan yang terakhir pada tahap keempat adalah melakukan analisis perambatan retak. Setelah melakukan analisis didapatkan bahwa umur maksimal struktur CWB adalah 27.065 kali terbang atau 50.070 jam terbang. Umur struktur hasil analisis ini bernilai lebih besar jika dibandingkan dengan pernyataan perusahaan manufaktur pesawat terbang tersebut yaitu sebesar 40.000 jam terbang.
Co-Authors Aziz, Ali Bambang Rahardjo Dimas, Agustinus Hery Setiawan, Hery Jarwadi, Maulana Hayu Leonardo Gunawan, Leonardo Nhat Vu, Nguyen Van Palar, Pramudita Satria Putra, Ichsan Setya Putra, Ichsan Setya Santosa, Sigit P Santosa, Sigit Puji Sugiono, Achmad Tam, Le Hoai Tatacipta Dirgantara, Tatacipta