Jurnal Teknik Mesin
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Simulation of Initial Cracks in Truck Wheel Drive Axle Flange Fillets Using the Finite Element Method
Get PDFLangsa residents rely on trucks as the main means of transporting palm oil from plantations. In mechanical systems, component failures often occur, often characterized by the breakdown of a particular part. Cracks are a key factor contributing to failure in machine structures. Early detection of cracks in shafts is critical to reducing damage, requiring the use of appropriate methods in the early stages of crack formation. This research aims to analyze the effect of crack initiation in truck drive axle flange fillets on stress and strain distribution using the finite element method. The simulation results show that the maximum shear stress in the area without cracks ranges from 0.0032 to 61.282 MPa, while after crack initiation, the shear stress value increases to 70.036 to 78.79 MPa. Likewise, the Von Mises stress increased from 0.006 to 106.74 MPa to 121.99 to 137.23 MPa after the crack was modeled. In addition, the maximum shear strain increased from 7.50610 - 5.38910 to 6.15910 - 6.92910 in the cracked area. These increases in stress and strain values indicate that the initial crack increases the stress concentration and local deformation, which accelerates the accumulation of structural damage in the shaft. This research emphasizes the importance of early crack detection and design strengthening to prevent structural failure in truck drive axle components
Pengelompokan Pola Cuaca Menggunakan Algoritma Clustering Machine Learning: Studi Kasus Banda Aceh
No full textoai:jurnal.usk.ac.id:article/48805Climate change and weather variability pose significant challenges to forecasting, risk mitigation, and adaptation planning. The complexity and multidimensionality of meteorological data often hinder manual pattern identification, thereby necessitating machine learning-based approaches. This study implements four clustering algorithmsK-Means, DBSCAN, Hierarchical Clustering, and Gaussian Mixture Models (GMM)to identify weather patterns in Banda Aceh using dataset obtained from climate.onebuilding.org. Model evaluation was conducted using internal metrics, namely the Silhouette Score, Davies-Bouldin Index, and Calinski-Harabasz Index. The results indicate that K-Means with two clusters achieved the best performance, with a Silhouette Score of 0.4521 and a Davies-Bouldin Index of 0.9254, suggesting compact and well-defined cluster separation. Visualization through PCA further confirmed the presence of two dominant weather patterns in Banda Aceh. These findings have the potential to provide valuable contributions to the understanding of atmospheric dynamics, support weather forecasting, and enhance solar energy adaptation planning in response to climate variability
The Influence of Fiber Composition on Tensile Properties and Machinability of Polyester/Biduri fruit fiber composites
Get PDFAbstractThis research was carried out to investigate the tensile properties and machinability of polyester composite materials reinforced with biduri fruit fibers. Composite materials are supplied in a variety of fiber compositions made by hand lay-up. Tensile testing was used to obtain tensile properties using an Instron tensile testing machine, while to obtain machinability, the machining process was carried out using an Agma CNC milling machine with a drill and end-mill process, the machining results were observed on the cut surface to analyze the machining quality. From the tensile test results, tensile strength and modulus of elasticity can be obtained. The tensile properties obtained from composite materials do not show consistent results, this is due to the influence of the composite manufacturing process and the nature of the fibers which absorb very high water vapor. Observation of the machining traces shows that the machining quality improves when the fiber composition increases
Effect of Cutting Parameters on the Quality of Micro Drill Process Results on PCB (Printed Circuit Board) Products
Get PDFPCB (Printed Circuit Board) is an important requirement in the world of electronics. Currently, printing PCBs is less efficient because the time required is quite long and the manufacturing process is also less efficient. This study analyzes the quality of the machining process of PCB products with tools 0.8 mm which includes the quality of the hole dimensions. Data collection was carried out with variations in spindle rotation and feeding. The hole quality analysis method used includes analyzing the accuracy of the hole using a microscope. The results of the analysis show that the accuracy of the hole dimensions has changed significantly in some tests. Tests were carried out with spindle rotations of 5,500 and 5,600 rpm, and the feeds used were 160 and 170 mm/min. In this study, the largest value obtained was 0.82 mm at 5500 rpm and 160 mm/min and 170 mm/min and the lowest value was 0.80 mm. This research provides an overview of the quality analysis of hole dimensions on PCBs. The results of the study can be a reference for the development of Micro Drill on PCB material by varying more machining parameters used, type of cooling media, tool shape, tool type and measurement method used
Pengaruh Ukuran Partikel Pengisi Terhadap Sifat Mekanik Komposit Poliester/Abu Sekam Padi
Get PDFThe study the focused on the effect of particle size toward mechanical properties of composite material. The composite material has been prepared from polyester as matrix and rice husk ash particles as filler. This research was conducted with the variations of particle size of white rice husk ash upon the mechanical properties. The mesh of particles size used in this composite are 50, 70, 100, and 400, with a matrix and filler ratio of 75%: 25% and the resin used was polyester with the stir casting method. The mechanical properties tests that carried out in this study were tensile testing, bending tests, compression tests, and impact tests. All the tests were performed using the ASTM standard for composite material testing. The result shows that small mesh number has significantly improve mechanical properties of composite material, the greatest tensile strength found in the mesh number of 400 with a value of 28,101 MPa, a bending strength of 56,187 MPa, a compressive strength of 30.8 MPa, and an impact value of 4194 J/m2
Flying Performance Analysis of Composites Control Line Handled U (UC) Model Aircraft
No full textAeromodelling is an activity of designing, making, and flying model aircraft. This study discusses the analysis of flight performance of in-house U-Control model aircraft produced using composite materials, focusing on flight tests, and comparing the flight test results with mathematical analysis. The aircraft that have been produced are tested by flying and get a range value of the aircraft is 0.605393 miles at sea level condition. While the results of mathematical analysis of the range obtained are 0.693157 miles. Where there is a difference of 0.087764 miles caused by the influence of wind during testing of model aircraft. In addition, the difference between flight test results and mathematical calculations highlights the complexity of testing not only on the influence of wind but also the aerodynamic factors of the model aircraft.Kata kunci: Aeromodelling, Pesawat Model UC, Aircraft Performance, Range
Kaji Eksperimental Perilaku Reduksi Briket Campuran Bijih Besi Lhoong Dan Batubara Pada Temperatur Tinggi
Get PDFThe steel demand in Indonesia is increasing every year. In 2021, it was recorded that the demand reached 15.9 million tons. Steel is obtained by processing the Iron. One of the well known methods to produce the iron is by reducing the iron ore below the smelted point temperature of iron. The purpose of this study is to find the effect of coal mixture and the effect of temperature variations to the mass loss and to the constant of briquettes reduction rate. The briquettes used have diameter of 40 mm. It was made from the mixture of iron ore, coal and clay under the composition of 90:00:10, 70:20;10 and 50:40:10, compressed at the pressure point of 15 tons. The test was begun by heating the furnace to the reduction temperature (950 C, 1050 C, 1150 C), then the briquettes were placed into the briquette container. The container was connected to a digital scale, and then it was placed into the reduction furnace. The measurement of mass loss was automatically carried by using a computer that had been connected directly to the scale. The amount of coal in the briquettes greatly affects the reduction of briquettes mass due to the reducing gas of CO that was excessively formed during the reaction process of coal carbon with CO2. The reaction of CO reducing gas formation is an endothermic reaction, therefore it requires high temperature in the process. Briquettes with a composition of 50:40:10 which are reduced at the temperature of 1150 C experience the highest number of mass reduction and reduction rate constants, each of those are 39,37% and 3,6672/s
Analisis Eksperimental Kegagalan Suspensi Belakang Light Truck Diesel
Get PDFThe rear leaf spring of the light truck diesel vehicle tends to experience failure when passing through a potholed road carrying a load of 11,000 Kg. Therefore, it is necessary to determine the factors responsible for these failures using experimental and numerical studies to prevent the reoccurrence of similar cases. The experimental study includes visual inspection to determine the factors responsible for the breakdown based on the surface condition of the broken spring. This is in addition to using SEM observation to observe the fracture surface condition of fractography and the hardness test to evaluate the hardness value of leaf spring. To visualize the structure, a chemical composition test is employed to analyze the steel standard and microstructure observation. The chemical composition test showed that the leaf spring material complies with the AISI 5160 standard. The visual inspection consists of an initial crack, which is then observed on the SEM. The average hardness of the horizontal and vertical directions is 114.05 HRB and 113.40 HRB, while for the outer surface, it is 114.36 HRB. Based on the observation, the structure of the pearlite phase is less than the ferrite, indicating that the leaf spring has more ductile properties
Study of Mechanical Properties of Vinyl Ester Composite with Glass Powder Filler
Get PDFAbstractThis research, study aims to investigate the influence of particle composition on the mechanical properties of vinyl ester composites with glass powder as a filler. The composites were fabricated using the stir casting method to mix vinyl ester and glass powder particles with a 200-mesh size. The compound in compositions of wt% vinyl ester as matrix and wt% glass powder as fillera as follows: 100/0, 90/10, 80/20, 70/30, and 60/40. Mechanical properties testing encompasses Tensile Testing, Compression Testing, and Bending Testing. The specimens and mechanical testing procedures adhere to ASTM standards: ASTM D638-I for Tensile Testing, ASTM D695 for Compression Testing, and ASTM D790 for Bending Testing. Based on the test results, the following data was obtained: The highest tensile strength was 39.15 MPa with a 10% particle content, while the lowest tensile strength was 9.19 MPa with a 40% particle content. The highest compressive strength was 80.04 MPa with a 40% particle content, while the lowest compressive strength was 42.21 MPa with a 0% particle content. The highest bending strength was 93.74 MPa with a 20% particle content, while the lowest bending strength was 69.84 MPa with a 30% particle content. The addition of the filler reduces the tensile strength, increases the compressive strength, and has a relatively minor impact on bending strength
Perancangan, Pembuatan dan Pengujian Alat Uji Getaran Bebas Sebagai Perangkat Bantu Ajar Fisika Terapan
Get PDFPerkembangan teknologi terus meningkat dengan pesat terutama pada proses produksi dan konstruksi dalam sebuah perkembangan industrial yang tidak asing bagi para akademika terutama pada bidang teknik mesin. Berkaitan dengan teknik mesin, banyak sekali ilmu yang wajib dipelajari, dari mulai rancang konstruksi, struktur otomotif, konstruksi crane, konstruksi jembatan dan lain-lain.Dari rancang konstruksi tersbut diperlukan suatu ilmu yang penting demi terjaganya keamanan dalam pemakaian, yaitu ilmu getaran. Ilmu getaran berhubungan dengan gerakan osilasi benda dan gaya yang berhubungan dengan gerak tersebut. Semua benda yang mempunyai massa dan elastisitas mampu bergetar. Mesin dan struktur rekayasa mengalami getaran sampai derajat tertentu dan dalam rancangannya memerlukan pertimbangan sifat osilasinya.Getaran bebas terjadi jika sistem berosilasi karena bekerjanya gaya yang ada dalam sistem sistem itu sendiri, serta tidak ada gaya luar yang bekerja. Sistem yang bergetar bebas akan bergetar satu atau lebih frekuensi pribadinya yang merupakan sifat sistem dinamika yang dibentuk oleh distribusi massa dan kekakuannya. Oleh karna itu dibutuhkan suatu pengujian untuk mengetahui karakteristi getaran bebas yaitu frekuensi, amplitudo, dan periode yang tidak dapat diketahui secara langsung. Diharapkan dengan adanya alat uji getaran bebas ini akan dapat membantu mahapeserta didik yang mengikuti perkuliahan Fisika Terapan untuk memahami lebih mendalam fenomena getaran