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Wahyu Dwi Lestari
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Journal : Journal of Mechanical Engineering Science and Technology

 1 
Wear Property of Machined Ultra High Molecular Weight Polyethylene (UHMWPE) Acetabular Liner Product with CNC Milling Lestari, Wahyu Dwi; Danaryanto, A T; Nugroho, A; Ismail, R; Jamari, J; Bayuseno, A P
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 5, No 2 (2021)
Publisher : Universitas Negeri Malang

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Abstract

UHMWPE has been used as a cushion in artificial hip joint for the last decades. The reliability of the components of a hip joint implant can be achieved by understanding their wear behavior. This study observed the tribological performance of the UHMWPE acetabular liner manufactured with a CNC milling machine on the femoral head made of SS 316L. Materials commonly used for tribo pairs in hip joint replacement. The wear tests were performed on a hip joint simulator in dry condition. The wear test is carried out by applying a constant load of 800N. Before and after the wear test, measurements of surface roughness and dimensional accuracy were carried out on the UHMWPE acetabular liner specimen. The correlation between the surface roughness of the machining process and the wear rate is seen from the value of the wear depth and the wear coefficient obtained. The results showed that the machining process affects the surface roughness of the acetabular liner, where the roughness also affects the wear rate of acetabular liner product.
Innovations in Additive Manufacturing for Socket Fabrication: An Overview Faiza, Linda Ziyadatul; Caesarendra, Wahyu; Lestari, Wahyu Dwi
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 8, No 2 (2024)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v8i22024p287

Abstract

Additive Manufacturing (AM) has transformed the prosthetics industry, particularly in socket production, which plays a critical role in the comfort, fit, and functionality of prosthetic limbs. This article examines the latest advancements in AM technologies and their applications in socket fabrication. Key techniques like stereolithography (SLA), selective laser sintering (SLS), and fused deposition modeling (FDM) have facilitated the production of highly personalized, lightweight, and durable prosthetic sockets. These methods not only improve design precision but also allow for the use of biocompatible, flexible materials, enhancing both comfort and functionality. Digital design tools have streamlined the production process, reducing lead times and costs, while improving accuracy and repeatability in socket manufacturing. This review explores the current state of AM in prosthetic socket development, emphasizing the benefits, challenges, and future directions of this fast-evolving field. By analyzing recent research and case studies, the article provides insights into how AM is reshaping prosthetics, offering more accessible solutions for individuals needing prosthetic limbs. It also discusses the challenges of material selection, regulatory considerations, and the potential for scaling production for broader use.
Tear Resistance Evaluation of Room Temperature Vulcanizing Silicone Rubber: A Comparative Study Mawandi, F.R.; Safitri, P.D.; Mirnanda, D.; Nurrokhim, F.H.R.; Adyono, Ndaru; Lestari, Wahyu Dwi
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p190

Abstract

Room Temperature Vulcanizing (RTV) silicone cures at room conditions, providing tear resistance and flexibility to a wide range of industries. Yet, its mechanical performance improvement continues to be difficult when it is filled and catalyzed. In this work, the tear resistance of three RTV materials—RTV 48, RTV 683, and RTV M4503—is investigated with different talc (2–4 wt.%) and catalyst (40–60 wt.%) formulations. Tear resistance testing per ASTM D624 yielded average and standard deviation values for material consistency determinations. Comparative analysis is also given in the research to ascertain the effect of over-cross-linking on elasticity and structural morphology. RTV 48 experienced a dramatic decrease in tear strength at high catalyst content due to over-cross-linking and the loss of elasticity. RTV 683 experienced initial improvement through the addition of talc, but excess catalyst caused premature cure and reinforcement loss. In contrast, RTV M4503 showed significant tear resistance enhancement as talc and catalyst were compounded optimally, maintaining structural integrity and reinforcement efficacy. Results demonstrate the crucial role of filler and curing agent concentration interaction in modulating silicone mechanical properties. RTV M4503 featured the optimal tear resistance and stable performance among the compositions assessed, indicating its potential use in applications requiring enhanced durability. This research provides a guide to optimization of additive ratios in RTV silicone formulations, guiding materials and process conditions selection for industrial applications that demand reproducible mechanical strength.
Development of Adjustable Static Test Equipment for Below-Knee Prosthetic Feet: A Case Study Nurrokhim, Firmansyah Hafizh Rizal; Mawandi, Fauzan Raka; Safitri, Puspa Dinda; Mahmudah, Imam; Mirnanda, Dwiky; Adnyono, Ndaru; Lestari, Wahyu Dwi
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p143

Abstract

The high prevalence of physical disabilities in Indonesia, particularly among the productive-age population, highlights the urgent need for advancements in prosthetic technology. While local fabricators have begun producing prosthetic feet, the lack of standardized testing procedures compromises safety and performance. This study addresses that gap by developing an adjustable static testing device tailored for below-knee prosthetic feet, focusing on keel and heel tests to evaluate mechanical performance. The device includes a jig-fixture platform adjustable to 8° and 15° for heel and keel tests, respectively. It applies a 1230 N load based on AOPA standards and integrates load and displacement sensors for accurate data acquisition. Structural components are constructed from AISI 1020 steel, with fabrication involving welding, assembly, and system calibration. The testing procedure adheres to ISO 10328 to ensure reliability under realistic loading conditions. An Ottobock SACH prosthetic foot was used in trials, demonstrating the device’s ability to classify prosthetic feet into dynamic and cushioned types, based on load-bearing and energy-return characteristics. Polynomial regression analysis showed high accuracy in capturing load-displacement behavior, with R² values above 0.85 for both tests. The results offer valuable guidance for local prosthetic fabricators aiming to design testing equipment or apply AOPA and ISO standards for quality assurance. This research supports the development of a standardized testing framework for prosthetic feet in Indonesia, enhancing product safety and quality while promoting alignment with international benchmarks. The outcomes also suggest potential for broader applications in advancing prosthetic technologies and establishing national standards.
Co-Authors Adnyono, Ndaru Ahmad Khairul Faizin Ahmad Khairun Faizin Alfattama, Lona Chinsia Althafiansyah, Rafif Zaidan Arie Chintya Martania Arif Hidayat, Muhammad Aryananda, Rangga Laksana Atika Andini Azizullah, Dana Afif Bayuseno, A P Danaryanto, A T Dera, Nurmala Santi Dewi, Deshinta Arrova Dwi Ari Suryaningrum, Dwi Ari Eva Yulia Puspaningrum Faiza, Linda Ziyadatul Faizin, Ahmad Khairul Fara Disa Durry Fauzan Raka Mawandi Febriansyah, Rahmad Ady Ferdi Kurniawan Fikri, Kemas Achmad Firmansah, Achmad Robi Ghozali, Achmad Imam Harya, Gyska Indah Humairah, Sayyidah Ika Nawang Puspitawati Ikhsanudin, Zaky Ishak, Sahional Ismail, R Issafira, Radissa Dzaky Jamari, J Kilo, Faisal Krolczyk, Grzegorz Kurniawan, Ferdi L.Urip Widodo, Yohandrik Novel Karaman Lestari, Mufida Diah Luluk Edahwati Luluk edahwati Luluk Edahwati Luluk Edahwati Mahameru, Rolland D.K. Mahameru, Rolland Darin Khalifah Mahmudah, Imam Mas Diyasa, I Gede Susrama Maulana, Hendra Mawandi, F.R. Mawandi, Fauzan Raka Mirnanda, D. Mirnanda, Dwiky Mr. Sutiyono Muhammad Abdillah Mukti, Abdi Satryo Ndaru Adyono Ndaru Adyono Ndaru Adyono, Ndaru Nikmah, Ulin Novel Karaman Nugroho, A Nunung Lusiana Margawati Nur Aini Fauziyah Nurrokhim, F.H.R. Nurrokhim, Firmansyah Hafizh Rizal Nuryananda, Praja Firdaus Pilargenta , Higan Prayoga, Adimas Dwi Radissa Dzaky Issafira Radissa Dzaky Issafira Radissa Dzaky Issafira Radissa Dzaky Issafira Rahardja, Dimas Revindra Rosyadi, Mochammad Wildan Rosyadi, Mochammad Willdan Rosyadi, Willdan Safitri, P.D. Safitri, Puspa Dinda Sakinah Sanjaya, Kadek Heri Sari, Tria Puspa Seno Darmanto Sri Utami Handayani Suares, Reza Mardiansah Sutiyono Talango, Novriyanti Tjahjono, Jojok Dwirido Tria Puspa Sari Tyas Martika Anggriana Wahyu Caesarendra Widagda, Garda Dibya Widya Kusumaningsih Wiliandi Saputro Wiliandi Saputro Wiliandi Saputro Yanto, Agus Dwi Yudha, Dhian Satria Zein, Isynariyah