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Rahmat Azis Nabawi
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Journal of Engineering Researcher and Lecturer
Published by Researcher and Lecturer Society
ISSN : -     EISSN : 29637511     DOI : 10.58712/jerel
Core Subject : Education, Engineering,
Chemical Engineering, Chemistry & Bioengineering Education Engineering Mechanical Engineering
The Journal of Engineering Researcher and Lecturer is dedicated as a forum for researchers and lecturers around the world to report the research results. All papers are peer-reviewed by at least two referees. The scope includes technological and learning innovation in engineering (miscellaneous). Technological innovation must be carried out continuously for a better life. However, its sustainability is inseparable from human resources. Thus, manuscripts on learning innovation are expected to be a reference in decision-making for a policy on engineering education, resulting in superior students in a sustainable manner. Technological innovations are expected to be a learning reference and can be mastered by students for sustainable human resource development.
Arjuna Subject : Ilmu Pengambilan Keputusan (semua kategori) - Ilmu Pengambilan Keputusan (Lain-Lain)
Articles 106 Documents
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Adhesion mechanisms and mechanical performance of single-lap joints in FDM-3D printed: A review Muhamad Qeisya Hanif; Rifelino Rifelino; Febri Prasetya; Zainal Abadi
Journal of Engineering Researcher and Lecturer Vol. 5 No. 1 (2026): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v5i1.214

Abstract

Additive Manufacturing (AM), particularly Fused Deposition Modeling (FDM), has evolved from a rapid prototyping technology into a manufacturing approach for producing functional components across a wide range of industrial sectors. Nevertheless, the limited build volume of FDM systems has encouraged the use of adhesive bonding as a practical method for joining sub-components, with the single-lap joint (SLJ) configuration being among the most widely adopted designs. This review aims to provide an integrated analysis of the relationship between FDM-induced surface morphology, the adhesion mechanisms developed at the bonded interface, and their implications for stress distribution, shear strength, and joint failure modes. The findings indicate that the surface characteristics generated by the FDM process, including layer lines, stair-stepping effects, voids, and porosity, create interfacial conditions that differ fundamentally from those of homogeneous materials. These characteristics also produce a non-linear relationship between surface roughness and joint strength. Process parameters such as printing orientation and layer height were identified as key controlling factors that influence surface topography and adhesive performance. From a mechanical perspective, the eccentric load path inherent in SLJ configurations generates significant shear and peel stress concentrations at the overlap ends. These stress concentrations coincide with structurally weak regions that are intrinsically associated with FDM adherends, making them the primary sites for crack initiation and joint failure. Furthermore, modifications to overlap geometry and tailored adhesive distribution have been recognized as effective strategies for improving stress redistribution and enhancing the load-bearing capacity of the joint. This review highlights that the assessment of adhesive joints in FDM-manufactured components requires an integrated analytical framework that accounts for the coupled interactions among printing process parameters, surface conditions, adhesive properties, and progressive failure modeling. Such an approach is essential for the development of reliable structural joint designs for FDM-based applications.
Post-weld heat treatment of GTAW-repaired aluminium 6061-T6 calliper brackets: Effects on surface integrity and micro vickers hardness Dipo Ariyo Nugroho; Zainal Abadi; Rifelino Rifelino; Andril Arafat
Journal of Engineering Researcher and Lecturer Vol. 5 No. 2 (2026): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v5i2.218

Abstract

The caliper bracket is a critical component of a motorcycle braking system that maintains the alignment between the brake caliper and the rotor. Repair of damaged caliper brackets is commonly carried out using the Gas Tungsten Arc Welding (GTAW) process. However, the thermal cycle during welding may alter the microstructure and degrade the mechanical properties of Aluminum 6061-T6. To overcome this limitation, post-weld heat treatment (PWHT), in accordance with ASTM B918, can be applied to restore the material properties and enhance the quality of the welded joint. This study investigates the effect of PWHT on the surface quality and microhardness of Aluminum 6061-T6 caliper brackets repaired using the GTAW process. An experimental approach was employed in which all specimens were welded using identical welding parameters and subsequently subjected to PWHT consisting of solution heat treatment, quenching, and artificial aging. Surface quality was evaluated through liquid penetrant testing in accordance with ASTM E165, while microhardness was measured using the Micro Vickers hardness test based on ASTM E384. The penetrant test results revealed that the welded specimens before PWHT contained welding defects, including porosity, lack of fusion, and lack of penetration, with a total of 35 defect indications. After PWHT, the number of defect indications decreased to 19, consisting only of microscopic porosity and lack of fusion. The average microhardness increased from 67.34 HV to 92.26 HV in the Fusion Zone (FZ), from 69.66 HV to 97.78 HV in the Heat-Affected Zone (HAZ), and from 62.44 HV to 95.70 HV in the Base Metal (BM), corresponding to increases of 45.66%, 40.49%, and 53.27%, respectively. Furthermore, PWHT restored the material hardness to 91.62% of the raw material hardness (103.96 HV). These findings demonstrate that PWHT effectively improves both the mechanical performance and the overall quality of GTAW-repaired Aluminum 6061-T6 caliper brackets.
Finite element analysis and crashworthiness evaluation of a multi-stage aluminium alloy 6061-T6 impact attenuator for Formula SAE Aditia Pratama; Zainal Abadi; Delima Yanti Sari; Wanda Afnison
Journal of Engineering Researcher and Lecturer Vol. 5 No. 2 (2026): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v5i2.219

Abstract

Formula SAE regulations require every prototype vehicle to be equipped with an impact attenuator as a passive safety system capable of absorbing a minimum frontal impact energy of 7,350 J at an impact velocity of 7 m/s for a vehicle with a mass of approximately 300 kg. This study aims to design an impact attenuator that satisfies the Formula SAE requirements to improve vehicle crashworthiness. Three design variations were analyzed using Finite Element Analysis (FEA) with LS-DYNA to evaluate energy absorption, impact force, acceleration/deceleration, and displacement. The accuracy of the numerical model was validated using previously published experimental data before analyzing the effect of thickness variation in each stage of the impact attenuator. The simulation results show that the optimum design is capable of absorbing impact energy above the minimum requirement of 7,350 J, exhibits a high Crash Force Efficiency (CFE), produces acceleration within the prescribed safety limits, and provides controlled deformation during the impact process. The results indicate that the proposed impact attenuator design satisfies the Formula SAE safety requirements and has the potential to be applied to prototype vehicles to improve safety performance during frontal collisions.
Mechanical characteristics and FEA-based non-uniform infill density approaches for Fused Deposition Modelling (FDM)-printed components: A literature review Mhd. Fahri Meihanda Putra; Syahril Syahril; Delima Yanti Sari
Journal of Engineering Researcher and Lecturer Vol. 5 No. 2 (2026): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v5i2.220

Abstract

Fused Deposition Modelling (FDM) is one of the most widely used additive manufacturing (AM) technologies for producing functional polymer components. However, commercially available slicing software generally applies a uniform infill density throughout the entire component without considering the actual stress distribution, resulting in excessive material usage in low-stress regions and unnecessary increases in component weight. This literature review synthesizes current knowledge on the mechanical characteristics of FDM-printed components and evaluates Finite Element Analysis (FEA)-based non-uniform infill density approaches as a promising strategy for structural optimization. The reviewed literature covers the effects of anisotropic behaviour, internal voids, infill density, infill pattern, and the integration of FEA with topology optimization techniques for FDM components. The findings indicate that the layer-by-layer deposition process produces pronounced mechanical anisotropy and introduces internal voids that influence structural performance. The relationship between infill density and mechanical strength is positive but nonlinear, whereas different infill patterns at the same density can produce variations of up to 82% in flexural strength. Although FEA provides reliable estimates of stress distribution, prediction errors of approximately 8.67–12% remain because conventional simulations assume homogeneous and isotropic materials that do not accurately represent the actual characteristics of FDM-printed components. Furthermore, FEA-based multi-zone non-uniform infill density strategies have been reported to increase peak load by up to 49% and bending stiffness by up to 46% compared with conventional uniform-density configurations. Overall, this review demonstrates that FEA-based non-uniform infill density is a promising design optimization strategy for functional FDM-printed components by improving structural performance while reducing unnecessary material usage. Future research should focus on density transition design and experimental validation to improve the reliability and practical implementation of this approach.
System dynamics for integrated domestic wastewater management: A review of stock–flow models, policy scenarios, and river water quality Widia Putri; Denny Helard; Shinta Indah
Journal of Engineering Researcher and Lecturer Vol. 5 No. 2 (2026): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v5i2.221

Abstract

Domestic wastewater management is a long-term systems problem shaped by population growth, water use, sanitation coverage, treatment capacity, infrastructure deterioration, institutional performance, finance, pollutant generation, and receiving-water conditions. This review synthesizes the use of System Dynamics (SD) for integrated domestic wastewater planning, with emphasis on causal-loop structures, stock–flow models, policy scenarios, pollutant-load estimation, and river-water-quality responses. A structured narrative search covering 2010 to June 2026 was used to identify peer-reviewed studies that applied explicit SD concepts to wastewater, sanitation, water pollution, or coupled water-quality management. The literature shows that most models represent population, wastewater generation, treatment capacity, and pollution control, but fewer integrate on-site sanitation, faecal-sludge pathways, microbiological pollutants, river hydrology, climate stress, finance, and institutional behavior in one model. Scenario analysis is widely used, particularly business-as-usual, capacity expansion, service-coverage improvement, treatment-efficiency enhancement, and combined-policy scenarios. The evidence indicates that isolated infrastructure expansion often underperforms when household connections, operation and maintenance, financing, or treatment efficiency remain constrained. More robust models combine service coverage and capacity dynamics with pollutant mass balance, receiving-water dilution, validation tests, and sensitivity or uncertainty analysis. Coastal and data-limited cities require additional representation of shallow groundwater, infiltration and inflow, flooding, tidal backwater, sea-level rise, and the dominance of on-site sanitation. The review proposes an integrated framework linking socio-demographic, service, infrastructure, treatment, pollutant, river-quality, financial, institutional, and climate subsystems. Future development should priorities spatial SD, participatory modelling, global sensitivity analysis, adaptive policy pathways, real-time monitoring, and hybridization with GIS, hydrological models, optimization, and machine learning.
Assessment of floating marine debris density, composition, chemical characteristics, and recycling potential along Gajah Beach and Pasir Putih Tabing Beach, Padang City, Indonesia Rizki Aziz; Budhi Primasari; Hirzan Salda Putra; Cici Amelia Edriani
Journal of Engineering Researcher and Lecturer Vol. 5 No. 2 (2026): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v5i2.222

Abstract

Floating marine debris is one of the major environmental challenges affecting coastal ecosystems and marine activities. Accumulation of floating debris can interfere with fishing operations by increasing the amount of debris captured in fishing nets and reducing fishing efficiency. This study evaluated the density, composition, chemical characteristics, and recycling potential of floating marine debris along Gajah Beach and Pasir Putih Tabing Beach, Padang City, Indonesia. Floating marine debris was collected using fishing trawls under two environmental conditions: normal weather and one day after a rainfall event. Samples were collected from three sampling points representing the study area and analyzed for debris density, material composition, proximate characteristics, and recycling potential. The average debris density increased from 1.18 g/m² under normal weather conditions to 3.13 g/m² after rainfall. Five material categories were identified, namely plastic, wood, rubber, fabric, and coconut husk. Plastic was the dominant material, accounting for 90% of the debris under normal weather conditions and 50% after rainfall, with corresponding densities of 0.90 g/m² and 1.66 g/m², respectively. Proximate analysis showed average values of 25.05% moisture content, 56.33% volatile matter, 8.53% ash content, and 9.09% fixed carbon. The results also indicate that plastic, wood, fabric, and coconut husk have potential for recycling or resource recovery. These findings provide baseline information for marine debris monitoring and support the development of more effective coastal waste management and resource recovery strategies in Padang City.

Page 11 of 11 | Total Record : 106

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