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Daryono
Universitas Muhammadiyah Malang
Mechanical Engineering

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The Effect of Electroplating Hard Chrome with Different Dissolvent Compositions to the Mechanical Properties of ST-37 Mohammad Jufri; Yeshar Ego Ginola; Rr. Heni Hendaryati; Ali Saifullah; Daryono
JEMMME (Journal of Energy, Mechanical, Material, and Manufacturing Engineering) Vol. 6 No. 3 (2021)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v6i3.20669

Abstract

Electroplating hard chrome is a metal plating process with hard chrome which aims to not only coat as decorative, but also to coat metal surfaces more strongly, according to their use in the engineering world. In addition to decorative properties, the advantages of surface treatment techniques can also increase hardness, wear resistance, and corrosion resistance. The purpose of this research is generally to determine the effect of different solution compositions in the electroplating process of hard chrome on the impact strength of the structure on ST-37 steel. This time the specimens are 100mm x 6mm x 6mm and 50mm x 50mm as many as 3 pieces. In this study, the electroplating process of hard chrome was carried out using different parameters of the CrO3 solution composition from previous studies, namely 200 gr/lt, 350 gr/lt, and 400 gr/lt with an immersion time of 22 minutes. The results of this electroplating process were tested by testing the impact strength and microstructure. The results of the study can be concluded that the more the composition of the solution, the higher the impact toughness. The highest impact toughness value is 0.998 joules/mm2 at a solution concentration of 400 grams/litre and the surface results on ST-37 steel after getting hard chrome electroplating treatment is that the surface has Cr elements attached and gets thicker with increasing concentration which is used as a variation with the same immersion time.
The influence of drying temperature variation on the quality of bagasse bio-pellet Mohammad Jufri; Billy Muhammad; Mulyono; Daryono; Heni Hendaryati; Ali Saifullah
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 8 No. 1 (2023)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v8i1.29192

Abstract

Demand for bio-pellet as alternative energy has widely increased. It occurs as people are aware of energy-saving for today and future living. Therefore, the increment in bio-pellet quality has also been a concern. The bio-pellet quality can be influenced by the materials (biomass) and its treatments. One of the treatments for the bagasse bio-pellet is drying. It is conducted to lessen its moisture before it is produced by the ring die pellet mill. The influence of drying temperature on bagasse bio-pellet quality is the focus of this experiment. The result shows that the different drying temperature for bagasse bio-pellet gives a different quality. However, those qualities comply with the requirement of the Indonesian National Standard for biomass energy.
Effect of tube shape variations on the mechanical performance of a runflat installation and removal tool using finite element analysis Dhio Marchel Pratama Putra; Iis Siti Aisyah; Muhammad Hasbi Rusmana; Daryono
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 10 No. 2 (2025)
Publisher : University of Muhammadiyah Malang

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Abstract

The increasing demand for operational efficiency in military vehicle maintenance has highlighted the need for effective tools for the installation and removal of runflat systems in armored vehicles. This study investigates the influence of tube cross-sectional geometry on the mechanical performance of a runflat installation and removal tool through finite element analysis (FEA) using ANSYS Workbench 2021 R2. Three tube geometries—hexagonal, octagonal, and circular—were modeled using SS400 structural steel as the material. Two loading scenarios were analyzed: bead loosening and runflat pressing. The evaluated parameters included Von Mises stress, total strain, total displacement, and safety factor. Simulation results indicate that the octagonal tube geometry demonstrated the best overall performance in the bead loosening scenario, with the lowest Von Mises stress (86.078 MPa), minimal strain (0.0001888 mm/mm), moderate displacement (0.62883 mm), and the highest safety factor (2.672). The circular tube geometry achieved the lowest displacement (0.59168 mm) but exhibited higher stress levels. In the runflat pressing scenario, all geometries operated within safe limits, with stress levels ranging from 11–14 MPa and safety factors reaching the maximum value of 15. These findings suggest that an octagonal tube geometry offers an optimal balance between strength, deformation control, and safety, making it suitable for field applications without revealing sensitive manufacturing details.
Co-Authors Ali Saifullah Billy Muhammad Dhio Marchel Pratama Putra Heni Hendaryati Iis Siti Aisyah Mohammad Jufri Muhammad Hasbi Rusmana Mulyono, M Yeshar Ego Ginola