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Load displacement simulation of CP-Ti/UHMWPE hip implant Handoko Handoko; Suyitno Suyitno; Rini Dharmastiti; Rahadyan Magetsari
Journal of Medical Physics and Biophysics Vol 8, No 1 (2021)
Publisher : Indonesian Association of Physicists in Medicine (AIPM/AFISMI)

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Hip implant made from titanium is special due to its lower modulus of elasticity to avoid stress shielding with the human bone. One type of load the material designed to withstand is a gradually increased compressive force which happened when the patient change his/her position from sitting to standing. This study examined the capability of a metal on polymer (MOP) implant made from commercially pure titanium (CP-Ti) and ultra-high molecular weight polyethylene (UHMWPE) loaded up to 3 kN according to ISO 14242 standard. Two CP-Ti/UHMWPE MOP models with femoral diameter of 22 mm and 32 mm were simulated with finite element. The results expressed in load displacement curves were validated with compressive load experimental tests. Both materials are capable to withstand the load. Simulation data are in good agreement with the experiments.

Analisis patahan fatigue pada steel bucket pin produk lokal Kevin Riefhano Setya Putra; Handoko - Handoko
Jurnal Material Teknologi Proses: Warta Kemajuan Bidang Material Teknik Teknologi Proses Vol 2, No 1 (2021): Jurnal Material Teknologi Proses Volume 2 Nomor 1 Tahun 2021
Publisher : Departemen Teknik Mesin, Sekolah Vokasi, Universitas Gadjah Mada.

Komponen steel bucket pin produk lokal yang digunakan pada excavator Komatsu seri PC200-7 mengalami patah saat penggunaan 2.000 jam. Sebagai pembanding, umur pakai komponen standar dari produsen excavator bisa tahan hingga pemakaian 10.000 jam. Tujuan penelitian ini adalah mengetahui penyebab steel pin bucket produk lokal patah pada umur yang pendek. Beberapa kemungkinan penyebab steel pin bucket patah adalah cacat material, kesalahan produksi dan pengoperasian. Metode yang dilakukan adalah menganalisis patahan pin dengan pengamatan visual dan foto makro, pengujian sifat mekanis, analisis material composition, dan pengamatan struktur mikro. Hasil pengamatan visual menunjukkan bahwa pin mengalami patah fatigue akibat overload dan beban impak. Hal ini terjadi karena munculnya konsentrasi tegangan di bagian permukaan yang disebabkan oleh pitting dan korosi. Selain itu, komposisi material pin menunjukkan bahwa bahan yang digunakan adalah baja karbon dengan kadar karbon kurang dari 0,8%. Bahan ini tidak sesuai untuk pin karena ketangguhan dan kekuatan dari material kurang.

Hubungan Antara Produktifitas Pemesinan dan Kualitas Permukaan Bahan UHMWPE Hasil Bubut Silindris dengan Mesin CNC Budi Basuki; Ignatius Aris Hendaryanto; Benidiktus Tulung Prayoga; Handoko Handoko
Jurnal Engine: Energi, Manufaktur, dan Material Vol 7, No 1 (2023)
Publisher : Proklamasi 45 University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30588/jeemm.v7i1.1461

UHMWPE (Ultra High Molecular Weight Polyethylene) is a unique polyethylene material widely used in biomedical applications as a bearing material for human body joint implants. The production of these UHMWPE implant components is still commonly performed with machine tools. Operation of these machines requires specific setting machining parameters in order to produce good UHMWPE surface quality without sacrificing the production cost. This research aims to find the relationship between cylindrical lathe machining productivity parameter, MRR (Material Removal Rate), and surface quality of the produced UHMWPE implant. MRR is directly related to production costs. The research was conducted by turning the UHMWPE at five feed rate variations between 0.025 to 0.2 mm/rev. and two depth of cut variations, 0.05 mm, and 0.1 mm, with a cutting speed of 150 m / minute. The test used a Denford FANUC CNC lathe machine with a cemented carbide cutting tool. Product quality was determined by measuring the topography or surface roughness of the material. Results show that the surface quality is inversely related to MRR. This problem can be solved by adjusting the depth of the cut. High productivity can be obtained by cutting thicker material. The difference in the surface quality of the cylindrical lathe machined material in the two depth of cut variations is not significant.

Analisis Dampak Pemasangan Zero Point Clamping System Terhadap Efektivitas Mesin CNC Milling 5 Axis Dengan Metode Overall Equipment Effectiveness Antari, Muhammad Aiman; Hendaryanto, Ignatius Aris; Handoko; Winarno, Agustinus
Jurnal Teknik Mesin Indonesia Vol. 19 No. 2 (2024): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

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The manufacturing industry sector in Indonesia is experiencing rapid development, significantly contributing to the national GDP. CNC milling 5-axis technology, offering high accuracy and efficiency, is increasingly being used across various industries. However, clamping process issues often hinder the optimal performance of these machines. This study analyzes the impact of implementing the Zero Point Clamping System on the effectiveness of CNC milling 5-axis machines using the Overall Equipment Effectiveness (OEE) method. The study results show a significant increase in the Availability value, which rose by 10.7% from 80.3% to 91%, and the Performance Rate, which increased by 2.9% from 93.4% to 96.3%, while the Quality Ratio remained unchanged. This improvement led to the OEE value increasing from 75% to 87.5%, indicating a 12.5% increase in effectiveness. The implementation of the Zero Point Clamping System significantly reduced Setup and Adjustment time from 13.8% to 4.7% and Idling and Minor Stoppage time from 5.9% to 4.4%, as well as reducing Reduced Speed Losses from 5.25% to 3.5%. These results demonstrate that the application of the Zero Point Clamping System can enhance the effectiveness of CNC milling 5-axis machines by reducing downtime and increasing machine speed, resulting in higher availability and improved machine performance. Consequently, this innovation makes a tangible contribution to improving operational efficiency and the competitiveness of Indonesia's manufacturing industry. Keywords: CNC milling 5 axis, Effectiveness, Overall Equipment Effectiveness, Zero Point Clamping System

Analisis Dampak Pemasangan Zero Point Clamping System Terhadap Efektivitas Mesin CNC Milling 5 Axis Dengan Metode Overall Equipment Effectiveness Antari, Muhammad Aiman; Hendaryanto, Ignatius Aris; Handoko; Winarno, Agustinus
Jurnal Teknik Mesin Indonesia Vol. 19 No. 2 (2024): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

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

The manufacturing industry sector in Indonesia is experiencing rapid development, significantly contributing to the national GDP. CNC milling 5-axis technology, offering high accuracy and efficiency, is increasingly being used across various industries. However, clamping process issues often hinder the optimal performance of these machines. This study analyzes the impact of implementing the Zero Point Clamping System on the effectiveness of CNC milling 5-axis machines using the Overall Equipment Effectiveness (OEE) method. The study results show a significant increase in the Availability value, which rose by 10.7% from 80.3% to 91%, and the Performance Rate, which increased by 2.9% from 93.4% to 96.3%, while the Quality Ratio remained unchanged. This improvement led to the OEE value increasing from 75% to 87.5%, indicating a 12.5% increase in effectiveness. The implementation of the Zero Point Clamping System significantly reduced Setup and Adjustment time from 13.8% to 4.7% and Idling and Minor Stoppage time from 5.9% to 4.4%, as well as reducing Reduced Speed Losses from 5.25% to 3.5%. These results demonstrate that the application of the Zero Point Clamping System can enhance the effectiveness of CNC milling 5-axis machines by reducing downtime and increasing machine speed, resulting in higher availability and improved machine performance. Consequently, this innovation makes a tangible contribution to improving operational efficiency and the competitiveness of Indonesia's manufacturing industry. Keywords: CNC milling 5 axis, Effectiveness, Overall Equipment Effectiveness, Zero Point Clamping System

Analisis Kekuatan Struktur Pada Desain Traction Rod Lokomotif Kereta Api Dengan Metode Finite Element Analysis (FEA) Irsad Makhbulloh Ilyasa; Ignatius Aris Hendaryanto; Handoko; Agustinus Winarno
Jurnal Engine: Energi, Manufaktur, dan Material Vol. 8 No. 2 (2024)
Publisher : Proklamasi 45 University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30588/jeemm.v8i2.1929

The structural strength of locomotive bogies is crucial for bearing operational loads and absorbing engine vibrations to efficiently transmit torque to the train wheels. The traction rod, a critical component in this system, plays a key role in transferring power from the main engine to the locomotive wheels. With the CC300 locomotive engine producing 2.200 hp, the traction rod experiences significant loads, necessitating regular maintenance. Given that this component is currently imported, the company is striving to redesign the traction rod to ensure strong structural integrity for local production, reducing dependency on imports and optimizing maintenance costs. The redesign involves adding structures to the existing design to even out stress distribution and enhance safety factors. Finite Element Analysis (FEA) is utilized to compare the structural strength between the original and redesigned designs, resulting in significant improvements in load-bearing capacity and deformation reduction. Simulation results show variations in stress, deformation, and safety factors among the original design, the redesign by the company, and the redesign by the researchers. The original design exhibits a stress of 194,64 MPa, deformation of 4,2817 mm, and a safety factor of 1,2844. The company's redesign achieves a stress of 438,37 MPa, deformation of 3.4356 mm, with a safety factor of 0,5703. Meanwhile, the researchers' redesign shows a stress of 154,05 MPa, deformation of 4,4812 mm, and a safety factor of 1,6288.

Kekuatan pergelangan kaki prostetik pergelangan kaki dengan bahan baja dan aluminium Handoko, Handoko; Dwi Setyana, Lilik; Basuki, Budi; Hari Priambodo, Bambang; Isyroudin, M. Habib; Kurniawan, Yani
Jurnal Teknik Mesin Indonesia Vol. 20 No. 1 (2025): Vol. 20 No. 1 (2025): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v20i1.812

Leg prosthetics as a device to increase the mobility of people with disabilities need to be supported in their development, especially in terms of comfort. Modifications to make prosthetics more comfortable to use are by utilizing the elastic properties of springs and base plate materials and dampers. This study analyzes the strength of steel and aluminium prosthetic base components in bearing the dynamic load of user's body. The analysis uses computational techniques with the finite element method. Computational results show that the most critical part of prosthetic, i.e. the base, is safe with maximum working stresses of 31,56 MPa for steel and 44,03 MPa for aluminium. Both materials are able to withstand the working stress.

Optimization of Gear Sprocket Surface Hardness through a Combination of Ice Water Quenching and Shot Peening with Pressure Variations Bambang Hari Priyambodo; Widia Setiawan; Handoko; Martinus Heru Palmiyanto Palmiyanto; Kaleb Priyanto; Yani Kurniawan
Teknobiz : Jurnal Ilmiah Program Studi Magister Teknik Mesin Vol. 16 No. 1 (2026): Teknobiz
Publisher : Magister Teknik Mesin Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/nttrpa77

The gear sprocket is a transmission system component that operates under repeated torsional and frictional loads, making its surface susceptible to wear. To improve wear resistance, a treatment is required to harden the surface layer without significantly altering its dimensions. This study aims to evaluate the effect of combining ice-water quenching and varying shot peening pressures on the surface hardness and microstructural changes of a medium carbon steel gear sprocket. The specimens were austenitized at 850 °C for 15 minutes and rapidly cooled using ice water. Subsequent shot peening was performed for 20 minutes using 0.6 mm diameter steel shots at pressures of 5, 6, 7, and 8 bar. Surface hardness was measured using the Vickers (HV) method, and microstructural observations were conducted with an optical microscope after 2% Nital etching to identify phase transformations. The results show that ice-water quenching increased the surface hardness from 199 HV to 329 HV, representing an increase of approximately 65% over the untreated condition. The combination of quenching and shot peening further enhanced hardness to 404 HV, 454 HV, 487 HV, and 552 HV at 5, 6, 7, and 8 bar, respectively, with the maximum improvement reaching 177% compared to the untreated specimen. Microstructural analysis revealed fine martensitic structures on the quenched surface and a plastically deformed layer produced by shot impacts. Therefore, the combination of ice-water quenching and shot peening effectively enhances surface hardness and refines the microstructure of gear sprockets, indicating its potential application in improving the transmission components wear resistance.

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