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All Journal IJOMEST : International Journal of Mechanical Engineering Science and Technology
Hooi Peng Lim
Politeknik Ibrahim Sultan, Malaysia

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Development of a Low-Alloy Steel Stress-Strain Curve Simulation Model Using the Ramberg-Osgood Approach Yuda Perdana Kusuma; Nasrullah Nasrullah; Hooi Peng Lim; Muchlisinalahuddin Muchlisinalahuddin; Muhammad Rabiu Abbas
International Journal of Mechanical Engineering Science and Technology Vol. 1 No. 1 (2026): IJOMEST: International Journal of Mechanical Engineering Science and Technology
Publisher : Asosiasi Diseminasi Rekayasa Dan Inovasi Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.67795/ijomest.v1i1.15

Abstract

The stress-strain curve is essential information in the analysis of material mechanical behavior; however, obtaining the curve directly requires specialized testing that is not always available. On the other hand, standard tensile test parameters such as yield strength, tensile strength, elongation, and reduction in area are commonly available from routine material testing. This study addresses this condition by developing a low-alloy steel stress-strain curve simulation model based on the Ramberg-Osgood equation using these four mechanical parameters as the primary inputs. The main parameter in this model is the strain hardening exponent (n), which is calculated directly from the available mechanical data. The calculated n values ranged from 1.992 to 38.211, with an average value of 14.17, which is consistent with the general characteristics of low-alloy steels. The simulated curves exhibited profiles consistent with the behavior of ductile metals, where each specimen produced different plastic deformation characteristics according to its respective mechanical properties. Internal validation demonstrated that the simulated curves showed complete agreement with the mechanical input parameters, without deviation across all analyzed samples. The results indicate that low-alloy steel stress-strain curves can be accurately reconstructed using only conventional tensile test data. Therefore, the developed model has the potential to serve as a practical solution for generating stress-strain curves when complete experimental curve data are unavailable but required for further engineering analysis.
Development of Chitosan-Based Graphene Hydrogel for EfficientSolar Evaporation Hooi Peng Lim; Limi Chong; Ida Rosmanizan Abdullah
International Journal of Mechanical Engineering Science and Technology Vol. 1 No. 2 (2026): IJOMEST: International Journal of Mechanical Engineering Science and Technology
Publisher : Asosiasi Diseminasi Rekayasa Dan Inovasi Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.67795/ijomest.v1i2.25

Abstract

This study aims to evaluate the effectiveness of developing a chitosan-derived graphene hydrogel for a solar evaporation system. The hydrogel was prepared in two types, i.e. flat-surface and hemispherical-surface hydrogels. The system consisted of a chitosan-derived embedded graphene hydrogel, a cotton wipe, and a thermal insulator. The system was then tested using a solar simulator to investigate the effect of varying irradiation times from 1 to 12 hours. The morphology of the hydrogel was characterised using an inverted microscope before and after irradiation for 1 and 12 hours, respectively. The experimental test includes temperature distribution and water mass loss for the samples before and after irradiation for 1 and 12 hours. The resultant findings provide useful data on the evaporation system efficiency under the simulated conditions. It was reported that the hemispherical-surface hydrogel reached a lower temperature distribution of 52 °C than the flat-surface hydrogel at 57 °C. The water mass loss of the hemispherical-surface hydrogel is as low as -1.22 g, indicating a higher evaporation rate of 0.09205 kgm−2 h−1 than the flat-surface hydrogel of -1.48 g and 0.04568 kgm−2 h−1, respectively. This study reveals that a lower total water mass loss can occur alongside a higher evaporation rate when the surface area exposed to air is very small, as in a hemispherical-surface hydrogel.
Experimental Assessment of Cooling Performance of a Portable Solar-Powered Thermoelectric Cooler Limi Chong; Ida Rosmanizan Abdullah; Hooi Peng Lim
International Journal of Mechanical Engineering Science and Technology Vol. 1 No. 2 (2026): IJOMEST: International Journal of Mechanical Engineering Science and Technology
Publisher : Asosiasi Diseminasi Rekayasa Dan Inovasi Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.67795/ijomest.v1i2.26

Abstract

Portable cooling systems powered by renewable energy are of interest for outdoor applications where conventional refrigeration is inconvenient. This study experimentally assesses the practical cooling performance of a portable solar-powered thermoelectric cooler based on cooling time and sustained cooling duration. The prototype has external dimensions of 400 mm × 400 mm × 350 mm and was designed for a nominal temperature range of 10–20 °C using a 100 W solar energy source. Cooling performance was evaluated using food and beverage loads and compared with a common cooler box. Three recorded trials were used for each load category. The portable solar cooler required an average of 85 min to cool the food samples and 34 min for drinks, whereas the common cooler required 60 min and 25 min, respectively. Although the prototype exhibited a slower pull-down time, its cooling duration was approximately 8 h compared with 3 h for the common cooler box. The results, therefore, indicate a trade-off between initial cooling rate and sustained temperature holding. The study contributes an experimentally based performance assessment of a low-cost solar-assisted thermoelectric cooling configuration and identifies thermal insulation, heat rejection and enclosure sealing as key areas for further improvement.
Co-Authors Ida Rosmanizan Abdullah Limi Chong Muchlisinalahuddin Muhammad Rabiu Abbas Nasrullah Nasrullah Yuda Perdana Kusuma