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Abstrak :
3D Printing adalah metode manufaktur aditif yang menciptakan objek 3D dari model digital. Objek dibuat secara layer-by-layer dengan material seperti plastik, logam, atau bahan organik pada sebuah bed printer. Untuk objek yang lebih besar dari ukuran bed printer, mereka dibagi menjadi beberapa bagian dan disambung menggunakan metode interlocking. Penelitian ini menguji empat jenis balok (U beam, I beam, bar beam, dan hollow beam) yang terbuat dari bahan High Strength Low Alloy (HSLA) dengan tiga jenis pembebanan (lentur, aksial, dan puntir). Mekanisme interlocking menggunakan pengunci male-to-female dengan variasi panjang pengunci male. Analisis tegangan dilakukan menggunakan perangkat lunak Autodesk Inventor. Hasil penelitian menunjukkan mekanisme terbaik: U beam - panjang male locker 10 cm dengan posisi pengencang 5 cm dari pangkal; bar beam dan I beam model 1 - panjang male locker 10 cm dengan posisi pengencang 1,67 cm dari pangkal; H model 2 - panjang male locker 20 cm dengan posisi pengencang 13,33 cm dari pangkal; dan hollow beam - panjang male locker 5 cm dengan posisi pengencang 1,67 cm dari pangkal. Panjang dan posisi ini menghasilkan faktor keamanan terbesar, sehingga cocok untuk aplikasi dengan beban tersebut. ......3D Printing is an additive manufacturing method that creates 3D objects from a digital model. Objects are built layer-by-layer using materials like plastic, metal, or organic matter on a printer bed. For objects larger than the printer bed, they are divided into sections and joined using interlocking methods. This research tested four types of beams (U beam, H beam, bar beam, and hollow beam) made from High Strength Low Alloy (HSLA) material with three types of loading (bending, axial, and torsion). The interlocking mechanism used male-to-female locking with variations in the male locker length. Stress analysis was conducted using Autodesk Inventor software. Results showed the best mechanisms: U beam - male locker length of 10 cm with the fastener position 5 cm from the base; bar beam and H beam model 1 - male locker length of 10 cm with the fastener position 1.67 cm from the base; H beam model 2 - male locker length of 20 cm with the fastener position 13.33 cm from the base; and hollow beam - male locker length of 5 cm with the fastener position 1.67 cm from the base. These lengths and positions yielded the largest safety factors, making them suitable for applications with those loads.

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Dalam menentukan perhitungan desain jaringan pipa lepas pantai pada tugas akhir ini difokuskan pada beberapa hal, yaitu; perhitungan ukuran diameter dan tebal dinding pipa serta analisa kestabilan jaringan pipa dan tegangan pipa saat pengoperasian. Ukuran diameter pipa akan berpengaruh terhadap laju aliran fluida, kecepatan aliran fluida, dan nilai jatuh tekanan sepanjang saluran pipa. Sedangkan ketebalan dinding pipa sangat dipengaruhi oleh tekanan eksternal (tekanan pada kedalaman laut) tidak hanya diatur berdasarkan tekanan internal (tekanan kerja aliran fluida) dan kualitas material pipa (nilai kekutan luluh material). Analisa kestabilan saluran pipa didasar laut perlu memenuhi dua parameter. Pertama, berat pipa dalam laut (saat pengoperasian) harus diatas gaya hidrodinamis pipa yang diakibatkan oleh gelombang dan arus laut. Kedua, gejala terjadinya vortax shedding dengan memperhitungkan rentang saluran pipa tidak tertumpu. Analisa tegangan pipa saat pengoperasian, memperhitungkan beberapa parameter. Pertama, tegangan tarik maksimum pipa disebabkan kerja fluida harus lebih kecil dari nilai tegangan maksimum izin material pipa. Kedua, kedalaman laut dan kekuatan luluh bahan pipa berpengaruh pada kegagalan struktur pipa, seperti buckling (kempis pada pipa). Ketiga, tegangan tarik maksimum saat melewati gundukan atau palung, agar tidak melebihi tegangan tarik izin bahan. Dari hasil perhitungan diperoleh; ukuran diameter yang dipilih adalah 32 inchi, tebal dinding pipa ideal adalah 0,406 inchi material API 5L X65, berat total pipa saat beroperasi sebesar 2.749,18 N/m yang diperoleh dari tebal dinding pipa anti korosi 3 inchi, tebal lapisan beton 3,94 inchi, tegangan kritis buckling sebesar 926,067 N/m2, sehingga diperoleh kedalaman laut maksimal agar tidak terjadinya buckling sebesar 92,1 m.

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Kendaraan untuk mengangkut manusia kini telah mengalami perkembangan yang sangat pesat. Berbagai kendaraan telah mengalami perkembangan fitur untuk memenuhi kebutuhan masyarakat. Kondisi jalan yang saat ini sudah sangat penuh cenderung sering terjadi kemacetan, menimbulkan ide untuk mengatasi permasalahan ini. Sehingga muncul ide konsep mobil terbang yang ditujukan untuk mengatasi masalah jalan yang padat dan mencapai waktu tempuh yang singkat bagi pengendara. Konsep mobil terbang ini sudah banyak dicetuskan oleh banyak peneliti namun belum ada yang direalisasikan dan dijual bebas agar dapat digunakan oleh khalayak ramai. Oleh karena itu diharapkan dari studi ini penulis dapat mengembangkan sebuah desain konsep dari mobil terbang yang kelak dapat diproduksi massal untuk menjawab permasalahan jalan yang padat. Studi ini meliputi analisis pengujian desain, konfigurasi, serta performa dari mobil terbang.

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ABSTRACT
Vehicles that are used to transport people from places to places has gone through some development by means of research. A lot of development has been done to private and mass transportations by their features to fit needs that the market demands. In the other hand, the mass production and consumerism toward vehicle has caused a new problem to emerge. The traffic jam is one of the major problems caused by the mass usage of private transportation. The rising demand of cars and other types of private transportation does not fit the infrastructure that is available. The capacity of road has reached its maximum and therefore traffic jam is inevitable. The concept idea of flying car is the answer to all these problems. Nevertheless, this concept that has been thought by many and has been built by many researchers has not emerged to fill the need of people. Therefore, by this study of flying car, writers can hopefully achieve the answer to all problems regarding traffic jam and fulfil the need of a futuristic transportation that is seamless and costs less. This study involves analysis of design evaluation, configuration, and also performance of flying car.

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Finite Element Method is one of the most power ful methods in numerical analysis techniques. The time consuming tasks and high costs can be reduced by using this method in the early stages of machine component design. The truck chassis is a base component of vehicles and integrates many of the truck component systems such as the axles, suspension, power train, cab and trailer. The truck chassis has been loaded by static, dynamic and also cyclic loading. Static loading comes from the weight of cabin, its contents and passengers. The movement of truck affects a dynamic loading to the chassis. The vibration of engines and the roughness of roads give a cyclic loading. The chassis used in trucks has almost the same appearance since models were developed 20 or 30 years ago, denoting that they are a result of slow and stable evolution of these frames throughout the years. The manufacturers of these chassis, in the past, and some still today, solve their structural problems by trial and error. Conducting experimental tests in the early stage of design are time consuming and expensive. In order to reduce these costs, it is important to conduct simulations using numerical software methods to find the optimum design. Determination of static, dynamic and fatigue characteristics of a truck chassis before manufacturing is important for design improvement. This paper presents the finite element analysis (FEA) of road roughness effects on stress distribution of heavy duty truck chassis.

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Skripsi ini membahas analisis tegangan yang dilakukan pada sebuah Vertical Leaf Filter dan fokusnya pada baut pengunci tutup filter. Metode yang digunakan adalah uji kekerasan material baut, pemeriksaan permukaan patahan secara visual, dan simulasi-stress analysis dengan menggunakan software Inventor. Hasil yang didapat adalah properties material baut Tensile Strength mempunyai nilai 831,45 MPa. Permukaan patahan baut memperlihatkan patahan ulet. Tegangan maksimum Von Mises yang dialami baut saat bekerja dengan tekanan internal filter melonjak hingga 6 bar diperkirakan dibawah 200 MPa. Kesimpulan yang didapat bahwa kekuatan baut pada kondisi genuine sangat kuat menahan beban tersebut.

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ABSTRACT
This purpose of this study is to discusses stress analysis performed on a Vertical Leaf Filter focused on its locking bolt. The method used are bolt material hardness testing to estimate tensile strength, and stress simulation of bolt. The results indicating that bolt material is estimated to have 831.45 MPa Tensile Strength. Maximum Von Mises stress suffering on bolt with internal pressure filter spiked up to 6 bar is estimated of 200 MPa. This study concluded that genuine bolts are strong enough to withstand their load during operation including sudden high pressure load.

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This book presents tensors and tensor analysis as primary mathematical tools for engineering and engineering science students and researchers. The discussion is based on the concepts of vectors and vector analysis in three-dimensional Euclidean space, and although it takes the subject matter to an advanced level, the book starts with elementary geometrical vector algebra so that it is suitable as a first introduction to tensors and tensor analysis. Each chapter includes a number of problems for readers to solve, and solutions are provided in an Appendix at the end of the text. Chapter 1 introduces the necessary mathematical foundations for the chapters that follow, while Chapter 2 presents the equations of motions for bodies of continuous material. Chapter 3 offers a general definition of tensors and tensor fields in three-dimensional Euclidean space. Chapter 4 discusses a new family of tensors related to the deformation of continuous material. Chapter 5 then addresses constitutive equations for elastic materials and viscous fluids, which are presented as tensor equations relating the tensor concept of stress to the tensors describing deformation, rate of deformation and rotation. Chapter 6 investigates general coordinate systems in three-dimensional Euclidean space and Chapter 7 shows how the tensor equations discussed in chapters 4 and 5 are presented in general coordinates. Chapter 8 describes surface geometry in three-dimensional Euclidean space, Chapter 9 includes the most common integral theorems in two and three-dimensional Euclidean space applied in continuum mechanics and mathematical physics.

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Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems, Volume 7 of the Proceedings of the 2018 SEM Annual Conference & Exposition on Experimental and Applied Mechanics, the seventh volume of eight from the Conference, brings together contributions to this important area of research and engineering. The collection presents early findings and case studies on a wide range of areas, including: - Inverse Problems/Hybrid Techniques - Material Characterizations Using Thermography - Thermoelastic Stress Analysis - Fatigue & Damage Evaluation Using Infrared Thermography - Integration of Infrared Thermography & DIC - Thermographic Non-Destructive Evaluation (NDE)