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All Journal Asean Journal of Science and Engineering (AJSE) ASEAN Journal for Science and Engineering in Materials
Njim, Emad Kadum
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analysis of Electric Vehicle (EV) Transmission Performance through Helical Rotor Gear Systems with Variable Helix Angles Hassan, Ali Raad; Jadoo, Aws Taha; Bakhy, Sadeq Hussein; Njim, Emad Kadum; Al-Maliky, Firas Thair
ASEAN Journal of Science and Engineering Vol 5, No 2 (2025): AJSE: September 2025
Publisher : Universitas Pendidikan Indonesia (UPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ajse.v5i2.87802

Abstract

This study investigates the effect of helix angle on the performance of electric vehicle transmission systems using a helical-rotor-geared test apparatus. Several gears and pinions with different helix angles were manufactured and tested at two rotational speeds. The research combined theoretical modeling and finite element analysis to calculate natural frequencies, followed by vibration analysis using an experimental setup. The Fast Fourier Transform was applied to accelerometer data to evaluate the dynamic behavior. The results showed that larger helix angles reduced vibration amplitude and noise levels. This occurs because smoother meshing at higher angles leads to improved load distribution and lower transmission disturbances. The combination of simulation and physical testing supports the optimization of gear dynamics in electric vehicle powertrains, contributing to quieter and more efficient systems.
Integrated Experimental, Statistical, and Finite Element Analysis of Nanoparticle-Reinforced Polymer Composites for Advanced Structural Applications Completed with Bibliometric Analysis Nassir, Layla M.; Jweri, Abdul-Rasool Kareem; Al-Ameen, Ehsan Sabah; Ogai-li, Ahmed Ali Farhan; Njim, Emad Kadum; Al-Maliky, Firas Thair; Jaber, Alaa Abdulhady; Al-Haddad, Luttfi A.; Al-Karkhi, Mustafa I.
ASEAN Journal for Science and Engineering in Materials Vol 5, No 2 (2026): (ONLINE FIRST) AJSEM: Volume 5, Issue 2, September 2026
Publisher : Bumi Publikasi Nusantara

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Abstract

This study investigates the mechanical and tribological behavior of polyvinylidene fluoride (PVDF)/unsaturated polyester resin (UPR) composites reinforced with 1–5% multi-walled carbon nanotubes (MWCNTs). Research on PVDF-based nanocomposites has increased significantly, according to a quick bibliometric screening of Scopus-indexed publications. MWCNTs were found to be one of the most influential reinforcement keywords, indicating a high level of interest in mechanically optimized polymer systems worldwide. In this study, specimens were tested for tensile, flexural, hardness, impact, wear, and reversed-bending fatigue performance. Results reveal that 3% MWCNT provides optimal strengthening, improving tensile and flexural properties, hardness, wear resistance, and fatigue life while reducing void content. Finite element simulations using ANSYS aligned with experimental findings, showing deviations below 10%. Statistical analysis (ANOVA) confirmed significant effects of MWCNT content. Overall, PVDF/UPR–MWCNT composites demonstrate excellent potential for advanced lightweight structural applications.
Fatigue Modeling and Mechanical Performance of Additively Manufactured and Commercial Polylactic Acid to Support Sustainable Development Goals (SDGs) Completed with Bibliometric Analysis Al-hadrayi, Ziadoon M. R.; Challabi, Samar M.; Flayyih, Mujtaba A.; Njim, Emad Kadum
ASEAN Journal for Science and Engineering in Materials Vol 6, No 1 (2027): (ONLINE FIRST) AJSEM: Volume 6, Issue 1, March 2027
Publisher : Bumi Publikasi Nusantara

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Abstract

This study evaluates the fatigue behavior and mechanical performance of polylactic acid (PLA) produced by fused deposition modeling (FDM) and compares it with commercially manufactured PLA to support Sustainable Development Goals (SDGs) related to sustainable manufacturing. Tensile, impact, and fatigue tests were conducted to evaluate the strength, toughness, and fatigue life under cyclic loading. A fatigue crack growth model based on linear elastic fracture mechanics and Paris’ law was developed and solved numerically using MATLAB. In addition, a bibliometric analysis was conducted to identify recent research trends connecting additive manufacturing, fatigue performance, and sustainability. The results show that process-induced anisotropy and defects significantly reduce the fatigue resistance of FDM-printed PLA, while optimized infill density and raster orientation improve performance. The findings provide practical guidance for the reliable and sustainable application of additively manufactured polymer components.
Mechanical Behavior and Optimization of Graphene-Reinforced TPU/PDMS Composites for Biomedical Applications Gheni, Emad Zuhair; Abdulmajeed, Adwaa Mohammed; Flayyih, Mujtaba A.; Njim, Emad Kadum
ASEAN Journal for Science and Engineering in Materials Vol 6, No 1 (2027): (ONLINE FIRST) AJSEM: Volume 6, Issue 1, March 2027
Publisher : Bumi Publikasi Nusantara

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Abstract

This study investigates the mechanical behavior and optimization of graphene-reinforced thermoplastic polyurethane (TPU) and polydimethylsiloxane (PDMS) composites for biomedical applications. A combined analytical, statistical, and computational approach was employed, including MATLAB modeling, regression analysis, and ANOVA. The results demonstrate that increasing PDMS content reduces elastic modulus, yield strength, and fatigue performance, while enhancing flexibility and impact resistance. The incorporation of nanographene significantly improves mechanical properties, with tensile strength exceeding 40 MPa and enhanced stiffness due to effective load transfer. Statistical analysis confirms that PDMS volume fraction is the dominant factor influencing performance. Optimal properties are achieved at 20–30% PDMS with graphene reinforcement, providing a balanced combination of strength, flexibility, and durability for biomedical applications.
Co-Authors Abdulmajeed, Adwaa Mohammed Al-Ameen, Ehsan Sabah Al-Haddad, Luttfi A. Al-hadrayi, Ziadoon M. R. Al-Karkhi, Mustafa I. Al-Maliky, Firas Thair Bakhy, Sadeq Hussein Challabi, Samar M. Flayyih, Mujtaba A. Gheni, Emad Zuhair Hassan, Ali Raad Jaber, Alaa Abdulhady Jadoo, Aws Taha Jweri, Abdul-Rasool Kareem Nassir, Layla M. Ogai-li, Ahmed Ali Farhan