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All Journal Journal of Dentistry Indonesia Rekayasa Mesin Mechanical Engineering for Society and Industry Automotive Experiences Indonesian Journal of Aerospace
Mohammad Adhitya, Mohammad
Department Of Mechanical Engineering Universitas Indonesia
Aerospace Engineering Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Dentistry Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Comparison of Popular Three-Dimensional Printing Materials for Oral and Maxillofacial Surgical Guidance Model Adhitya, Mohammad; Sunarso, Sunarso; Muis, Abdul
Journal of Dentistry Indonesia Vol. 27, No. 3
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The application of three-dimensional (3D) models in the medical field has become popular. However, the accuracy of 3D models for surgical guidance varies among different materials and 3D printing technologies, such as printing machine usage. Objectives: This study aims to obtain more information about the effect of three different materials printed using a fused deposition material printer from the same digital data source. This study also aims to compare, analyze, and test the materials’ ability. Methods: Each of the filament materials (acetylbutane stearate [ABS], polylactic acid [PLA], and high-impact polystyrene [HIPS]) are printed at two infill densities, their weight, volume, and dimension are measured, and infill materials are prepared. Printing time is estimated and calculated on the basis of printing properties by using Simplify3D© software. The strength and surface tension of each sample are examined via a drilling test. Results: PLA is better than ABS and HIPS for printing our 3D model because of its properties. Conclusion: Ideal 3D materials for printing 3D models should fulfill the criteria on accuracy, strength, weight, and durability for usage. However, production time and cost should also be considered.
OPTIMIZATION OF LIGHTWEIGHT ELECTRIC BUS FRAME DESIGN THROUGH VALUE ENGINEERING APPROACH: A SYSTEMATIC REVIEW AND PARAMETRIC FEASIBILITY ANALYSIS Artana, I Nyoman; Sumarsono, Danardono Agus; Huda, Mahfudz Al; Adhitya, Mohammad
Jurnal Rekayasa Mesin Vol. 16 No. 2 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i2.2119

Abstract

Lightweight frame design plays a critical role in improving the efficiency and sustainability of electric buses. This study aims to explore the optimization of electric bus frame design through the application of Value Engineering (VE), using a systematic literature review (SLR) supported by technical simulation references. The review focused on key parameters, including material selection, structural topology, component dimensions, and production costs, analyzed across more than 40 publications from reputable databases over the past decade. Various studies demonstrate that substituting conventional steel with aluminum alloy 6063 can reduce frame weight by up to 30%, while topology optimization based on Finite Element Analysis (FEA) achieves more efficient load distribution and structural integrity.  Additionally, shifting from manual to robotic welding methods has shown to enhance production efficiency by approximately 20%. Despite higher initial costs, VE supports long-term benefits by reducing operational costs, improving energy consumption, and aligning with sustainability goals. The findings suggest that integrating VE into the early stages of electric bus frame design offers a strategic pathway toward lighter, safer, and more cost-effective transportation solutions.
Effect of Hybridization on Tensile, Shear and Compressive Properties of Carbon Based Fiber Reinforced Composites Abdurohman, Kosim; Adhitya, Mohammad
Indonesian Journal of Aerospace Vol. 19 No. 2 (2021)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2021.v19.a3575

Abstract

The high specific stiffness and strength of composites make them widely used  in defence, marine, and aerospace applications. Hybrid composites have increased use in high-tech applications. The glass/carbon and KC/carbon hybrid composites manufactured by vacuum assisted resin infusion methods are used in this study. The matrix used for both composites are vinylester resin. The glass/carbon and KC/carbon hybrid laminates arrangement is [G/C/G2/C/G2/C]s and [(KC)2/C3]s, respectively. The mechanical properties are evaluated according to ASTM standards. Fracture micrograph analysis are investigated using SEM. The comparison of mechanical properties and surface fracture of both hybrid composites have been investigated. The tensile and compressive strength of KC/carbon are higher than glass/carbon hybrid composites. However, the shear strength of KC/carbon is lower than glass/carbon hybrid composites. SEM micrograph exhibits that the KC/carbon has a good fiber/matrix and interlayer bond better than glass/carbon hybrid composites.
Analisis Kekuatan Struktur Komposit Dengan Ply Drop-off Pada Roda Pendarat Utama Pesawat Nir Awak Menggunakan Metode Elemen Hingga Wandono, Fajar Ari; Adhitya, Mohammad
Indonesian Journal of Aerospace Vol. 17 No. 1 Juni (2019): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2019.v17.a3037

Abstract

Penggunaan ply drop-off telah banyak digunakan untuk mengoptimalkan struktur komposit sehingga memiliki massa yang lebih ringan dibandingkan dengan struktur komposit dengan penggunaan ketebalan seragam. Tulisan ini akan memprediksi kekuatan dan potensi pengurangan massa struktur komposit dengan menggunakan ply drop-off pada roda pendarat utama pesawat nir awak terhadap beban operasional menggunakan metode elemen hingga. Beban operasional diasumsikan merupakan beban statik akibat landing sebesar 245 N arah vertikal dan sebesar 78.75 N arah horizontal. Struktur roda pendarat utama dimodelkan menggunakan elemen Quad4 dengan memasukkan sifat mekanis dari material e-glass Woven Roving 185 pada software MSC. Patran/Nastran. Kriteria kegagalan yang digunakan adalah berdasarkan kriteria kegagalan Tsai-Wu dalam indeks kegagalan dan margin of safety. Hasil yang didapatkan adalah struktur roda pendarat utama memiliki indeks kegagalan 0.62 dan margin of safety sebesar 1.39. Dari hasil tersebut menandakan struktur roda pendarat utama cukup kuat dan tidak terjadi kegagalan dalam menerima beban operasional yang diberikan. Di samping itu, potensi pengurangan massa pada struktur roda pendarat utama menggunakan ply drop-off adalah sebesar 18%.
Experimental study on a new prototype design of electric bus vehicle structure under torsion loading conditions Haryanto, Budi; Sumarsono, Danardono Agus; Karmiadji, Djoko Wahyu; Adhitya, Mohammad; Kristianto, Stevanus Brian; Deprian, Lukyawan Pama
Mechanical Engineering for Society and Industry Vol. 5 No. 2 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.13559

Abstract

Vehicles commonly encounter uneven road conditions, which can lead to torsional deformation of the frame structure. The results of finite element analysis (FEA) indicate that the highest stress occurs under torsion loading conditions. To validate these simulation results, an experimental study was conducted involving static load testing under torsional loading conditions on a hybrid frame structure, composed of SS 400 carbon steel and 6061 aluminum alloy, designed for a 70-passenger electric bus. The test was performed by applying a static load of 6,825 kg as sandbags on the seating area and aisle, and supporting the frame on three wheels only. Strain measurements were recorded using 28 strain gauges: 20 on the SS 400 carbon steel underframe and 8 on the 6061 aluminum alloy structure of the side and roof frames. The total load was the weight of 70 passengers plus a 30% dynamic load factor. Experimental analysis revealed a maximum stress value of 76.42 MPa in the SS 400 carbon steel of the underframe at location 9 in the central section of the underframe. In the 6061 aluminum alloy structure, the maximum stress value of 15.56 MPa was obtained in the roof frame directly below the air conditioner unit. Overall, the measured stress values were within the elastic ranges of the materials used, demonstrating structural integrity under load. The average difference between the experimental results for stress and the finite element analysis (FEA) simulation was approximately 11.21%.
Crashworthiness of Thin-Walled Structures: Influence of Materials, Geometry, Manufacturing Processes and Loading Conditions Ardiansyah, Riki; Istiyanto, Jos; Adhitya, Mohammad; Muttaqie, Teguh
Automotive Experiences Vol. 9 No. 2 (2026)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.16034

Abstract

Crashworthiness is a critical requirement for lightweight structures in automotive, electric vehicle and aerospace applications, where efficient energy absorption and controlled force transmission are essential. This review looks at more than 100 experimental, numerical, and analytical studies published between 2013 and 2025. It focuses on how materials, geometry, manufacturing processes, and loading conditions work together to affect the crashworthiness of thin-walled structures. Using a PRISMA inspired systematic narrative review combined with bibliometric and thematic analyses, key performance metrics: peak crushing force (PCF), mean crushing force (MCF), energy absorption (EA), specific energy absorption (SEA) and crushing force efficiency (CFE) are evaluated across metals, polymers, composites and hybrid systems, as well as non-tapered, tapered geometries under quasi-static and dynamic loading. The reviewed studies show that crashworthiness is best improved through a good combination of material, geometry, manufacturing quality and loading conditions. Hybrid structures are particularly promising, but their performance depends heavily on the interface quality, shape, and testing conditions.
Effect of Manufacturing Route and Fiber Orientation on the Mechanical Performance of Carbon Fiber Composites for Automotive Lightweight Components Abdurohman, Kosim; Adhitya, Mohammad; Istiyanto, Jos; Kurniawan, Farohaji; Habibullah, Mohammad; Agustian, Rialdi; Pratama, Mikhael Gilang Pribadi Putra; Utama, Agus Bayu; Aritonang, Rian Suari
Automotive Experiences Vol. 9 No. 2 (2026)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.16310

Abstract

This study evaluates the effects of manufacturing method and fiber orientation on the mechanical performance of carbon fiber-reinforced polymer (CFRP) composites for automotive applications. Unidirectional CFRP laminates were fabricated using vacuum bagging (VB), vacuum-assisted resin infusion (VARI), and hand lay-up (HLU). Specimens with 0° and 90° fiber orientations were tested under tensile and compressive loading, while ±45° specimens were evaluated for in-plane shear response through tensile testing. Short-beam and V-notched beam tests were conducted to determine interlaminar shear and shear properties. Microstructural characterization of the manufactured laminates and fractured specimens was performed using CT-scan and SEM, supported by finite element validation. Unlike previous studies focusing on limited properties or a single manufacturing route, this work provides a comprehensive comparison of HLU, VB, and VARI CFRP laminates by integrating mechanical testing, defect analysis, fracture observations, and numerical assessment. The results show that VARI produced superior laminate compactness and the highest tensile-related properties, although this improvement did not correspond to higher interlaminar shear strength, highlighting the influence of manufacturing-induced laminate architecture. For 0° specimens, ultimate tensile strengths were 507.72 ± 52.14 MPa for HLU, 685.69 ± 62.65 MPa for VB, and 774.31 ± 58.18 MPa for VARI. At ±45°, tensile strengths were 20.85 ± 0.82, 21.20 ± 0.45, and 22.18 ± 0.81 MPa, respectively. At 90°, manufacturing method had no significant effect on tensile strength, although tensile modulus remained method-dependent. The highest 0° compressive strength was obtained by HLU at 124.8 ± 13.1 MPa, whereas VARI showed the highest 90° compressive strength at 44.60 ± 0.82 MPa. VARI exhibited lower shear and interlaminar shear strengths of 15.31 ± 1.01 and 13.68 ± 0.85 MPa, respectively, indicating that increased fiber volume fraction did not substantially improve these properties. Nevertheless, VARI achieved the highest tensile and shear moduli, reaching 39.31 ± 4.58 GPa and 1.50 ± 0.15 GPa. Microstructural observations confirmed that improved resin distribution, reduced defects, and stronger fiber–matrix bonding in VARI contributed to enhanced overall mechanical performance. These findings demonstrate that manufacturing route governs different failure mechanisms and should therefore be selected according to the dominant loading mode and required laminate properties.
Co-Authors A. Azis Abdul Muis Abdurohman, Kosim Agustian, Rialdi Ardian Roekettino Ardian Roekettino, Ardian Aritonang, Rian Suari Artana, I Nyoman Bayu Trianto Bayu Trianto, Bayu Budi Haryanto D. A. Sumarsono Danardono Agus Sumarsono Deprian, Lukyawan Pama F. A. Falah F. Arrafi F. Zainuri G. Fauzan Habibullah, Mohammad Huda, Mahfudz Al I. Choiri I. Wahyudi Jos Istiyanto Karmiadji, Djoko Wahyu Kristianto, Stevanus Brian KURNIAWAN, FAROHAJI M. Triananda Muttaqie, Teguh Nandy Setiadi Djaya Putra Nur ‘Azah Pratama, Mikhael Gilang Pribadi Putra RA. Koestoer Riki Ardiansyah, Riki Utama, Agus Bayu Wandono, Fajar Ari