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Design, fabrication, and performance testing of an energy storage and return (ESAR) foot prosthesis made of prepreg carbon composite Ismail, Rifky; Nursafitri, Murti Ayu; Fardinansyah, Akmal Putra; Fitriyana, Deni Fajar; Bayuseno, Athanasius Priharyoto; Siregar, Januar Parlaungan; Setiyo, Muji; Istiqomah, Alfiana Fitri; Sulistyo, Sulistyo
Mechanical Engineering for Society and Industry Vol 5 No 1 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.12652

Abstract

The high demand for prosthetics in Indonesia is not followed by the ability and quality of local production to fulfill the community's needs. There is a lack of comprehensive data regarding the specific challenges encountered by local prosthetic manufacturers in Indonesia, particularly in terms of technological limitations. This study aims to understand the effect of design parameters on the performance of the energy storage and return (ESAR) foot prosthesis prototype in normal walking activities for amputees. Three different designs were created according to commercial products, and a convergence test was conducted to ensure accurate results. Finite element method (FEM) analysis was used to determine the amount of deformation that occurred in each design made when applied with 824 N axial force. The ESAR foot prosthesis prototype made from carbon prepreg was fabricated using an out-of-autoclave method, and the mechanical testing was performed with a compressive test. The results indicated that the optimal design for the ESAR foot prosthesis determined by the decision matrix scoring criteria was Design 3. The final scores for Designs 1, 2, and 3 were 54, 53, and 77, respectively. Design 3 is the easiest to manufacture, has the slightest complexity, and the lightest mass, and undergoes the least deformation during simulation, although it is the least attractive. The study found a significant difference in displacement between the deflections obtained from simulation and experiment. This occurred because the prototype was found to have delamination, which decreased the load-bearing ability of the prototype during compressive testing. Compressive testing on the prototype yielded a deflection of 22.695 mm in heel strike and 18.065 mm in toe-off positions, while FEM analysis showed 16.377 mm and 3.912 mm. Therefore, strict quality control is essential, especially when using materials such as carbon prepreg, which are prone to delamination if not properly processed.
Analisis Perbandingan Kontak Mekanik pada Permukaan Sinusoidal dengan Variasi Kondisi Pelumasan Menggunakan Metode Elemen Hingga Anwar, Syaiful; Lamura, M. Danny Pratama; Jamari, Jamari; Bayuseno, Athanasius Priharyoto
ROTASI Vol 27, No 1 (2025): VOLUME 27, NOMOR 1, JANUARI 2025
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.27.1.1-7

Abstract

Studi tentang kontak antara dua permukaan sangat menarik untuk dipelajari karena berhubungan dengan gesekan, pelumasan, dan keausan. Mekanika kontak berperan sangat penting dalam bidang tribologi. Penelitian ini bertujuan untuk mengetahui fenomena-fenomena yang terjadi pada pemodelan entrapped oil dalam kondisi kontak kering dan kontak berpelumas pada geometri sinusoidal. Proses simulasi dilakukan menggunakan Finite Element Method (FEM) dengan bantuan software Abaqus CAE 2020. Bentuk geometri dimodelkan sebagai axisymmetric 2D dengan ukuran elemen 0,01 untuk plat kaku dan 0,0005 untuk model geometri. Penelitian dilakukan pada model dengan ketinggian 2 mm dan memiliki kedalaman cavity 0,02 mm yang diberikan tekanan (0,5 MPa - 640 MPa) dari bawah model. Penelitian ini meninjau hasil von Mises stress, contact area, dan deformasi pada setiap kondisi variasi. Hasil penelitian menunjukkan bahwa model sinusoidal pada kontak berpelumas menghasilkan nilai von Mises stress, contact area, dan deformasi yang lebih kecil dibandingkan model sinusoidal pada kontak kering. Pada parameter tegangan von Mises, variasi kondisi pelumasan yang diterapkan menghasilkan perbedaan sebesar 28,41%. Sementara itu, untuk parameter area kontak dan deformasi, perbedaan kondisi pelumasan memberikan perbedaan hasil masing-masing sebesar 42,79% dan 16,46%. Analisis ini sangat penting bagi para peneliti untuk memahami pengaruh signifikan pelumas dalam kontak mekanik.
Stress distribution on the L1/L2 endplates under multiaxial loads: A finite element study Wicaksono, Hasyid Ahmad; Rafli, Muhammad; Bilal, Muhamad; Lamura, M. Danny Pratama; Maula, Mohamad Izzur; Bayuseno, Athanasius Priharyoto; Winarni, Tri Indah; Jamari, Jamari
Mechanical Engineering for Society and Industry Vol 5 No 1 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.12843

Abstract

Understanding stress distribution on lumbar vertebral endplates is essential for predicting mechanical failure and guiding clinical interventions. Therefore, this study aims to investigate the von Mises stress patterns on the L1/L2 endplates under multiaxial loading using a 3-dimensional finite element (FE) model derived from CT imaging of a healthy 55-year-old male. Anatomical structures were reconstructed in Mimics 21.0, and simulations were conducted in ANSYS Workbench 2023 R2. Material properties for cortical bone, cancellous bone, and intervertebral disc were assigned based on validated biomechanical data. A compressive load of 500 N and multiaxial moments ranging from 2.5 to 10 N•m were applied to simulate physiological movements, while the inferior surface of L2 was fully constrained to reflect realistic boundary conditions. The results showed that the superior endplate experienced the highest von Mises stress, particularly during flexion and lateral bending, indicating increased vulnerability to mechanical overload. Extension loading significantly reduced stress on both endplates, with a 60.54% decrease on the superior endplate and 69.17% on the inferior endplate. Stress distribution was asymmetrical and was influenced by anatomical features, such as cortical thickness and trabecular alignment. These results show the superior endplate as a biomechanically critical region prone to degeneration, emphasizing its importance in implant design, preventive strategies, and risk assessment for microfracture in high-risk populations.
Co-Authors Ade Ramos Ferdinand Agus Tri Prasetyo Ahmad, Zakki Kurniawan Ajeng Fitria Satriani Akhlis Rahman Nurhidayat Akhmad Ibrahim Jayeng Kelana, Akhmad Ibrahim Jayeng Alif Nugroho Ardhi Sudradjat Ardia Wanandi Suwarno Arkawira Nul Salam Bakti Sofyarto Basmal Basmal Chrisman Chrisman Cionita, Tezara Dedas Agusta Dedas Agusta, Dedas Dewi Handayani Dinulloh, Muhammad Rafli Wiratama Erizal Andi Setyarso Fajar Eka Putrandono Fardinansyah, Akmal Putra Farid Abdul Rahman Fitriyana, Deni Fajar Gilang Ramadhan Gunawan Dwi Hariyadi Hasnil, Nabiilah Hisyam Ma’mun I. Istadi Ilham Fajar Bagaskara Istiqomah, Alfiana Fitri J Jamari J. Jamari Juwantono Juwantono Kusumaning R. Putri Lamura, M. Danny Pratama Mohamad Izzur Maula Muhamad Bilal Muhammad Hafizh Mubarak Muhammad Usamah Muji Setiyo Munadi Munadi Nasrudin Arif Chamdani Negoro, Dipo Adi Nursafitri, Murti Ayu Pandhu Madyantoro Ardi Pratama Yudha Nugraha Prawibowo, Hartanto Primayoga Hogantara Sowiyk Putra, Mileno Marandria Rafli, Muhammad Reswara, Ghani Widyatna Rifky Ismail Rilo Berdin Taqriban Rohmatullah, Muhammad S. Muryanto S. Muryanto S. Muryanto S. Muryanto S. Muryanto S. Nugroho S. wilastri Sanjaya Okky Wijayanto Sardianto Sardianto Seon Jin Kim Siregar, Januar Parlaungan Sofyan Abdillah Sri Nugroho Sugiyarta Sugiyarta Sulistyo Sulistyo Sumar Hadi Suryo Susilo Adi Widyanto Sutrisno Sutrisno Syaiful . Syaiful Anwar Tavan Faiz Dhiahaqi Titis Septianna Sari Toi’in Toi’in Tri Indah Winarni Tri Joko Sampurno Vivi Aisah Fardilah Wahyu Hidayat Wahyu Sulistyono Wicaksono, Hasyid Ahmad Wijayanto, Juli Eri Yusuf Umardhani