The main objective of this study is to analyze the tensile strength of PLA parts manufactured through fused filament fabrication (FFF) using a commercially available 3D printer. This study is primarily focused on the effects of the tensile strength of specimens subjected to the influence of four factors; layer thickness, fill density, raster orientation and sample structure type. A 2331 mixed-level factorial design approach was used, and the individual effects of the four main factors and their interactions determined. This experimental design had been implemented for two different infills: rectilinear and honeycomb. Specimens were printed at raster orientation angles of 30 °, 60 ° and 90 ° at a fill density of 50 % and 100 %. A layer thickness of 0.15 mm and 0.05 mm was chosen for printing the specimens. The samples were tested using a standard tensile testing machine with an extensometer to determine mechanical strength characteristics such as ultimate tensile strength, maximum force and maximum elongation. The data obtained was then analyzed using Minitab 13.20 software. The results showed that 30 ° raster orientation yields the highest mechanical properties at each individual layer when compared to 60 ° and 90 °. The fill density proves to be the most influential parameter on tensile strength, followed by the sample structure type. The results also found tensile strength to directly proporionate to layer thickness. By improving the material properties through the addition of layers as observed in the results, it will be possible to provide support for software developers, mechanical designers and engineers to reduce manufacturing time, material use and costs.

Deformation and microstructural analysis of fiber laser and TIG welding of thin Ti6Al4V sheet by coordinate measurement machine (CMM) İnce Ti6Al4V saçların fiber lazer ve TIG kaynağı sonrası koordinat ölçme makinası (CMM) ile deformasyonunun ve mikroyapısal analizinin yapılması Yazar(lar)

No abstract

Bu derleme makalesi, katmanlı imalatta (Kİ) sensör entegrasyonuna odaklanmıştır. Devrim yaratma potansiyeline sahip katmanlı imalat, ürün tasarımı ve malzemelerinde benzeri görülmemiş bir esneklik sunar. Ayrıca Kİ, montajı yalnızca tek bir bileşenle mümkün kılarak diğer üretim yöntemlerinden ayrılmaktadır. Bu özellik, sensörü üretim sürecinde doğrudan entegre etmeyi mümkün kılmaktadır. Sensör entegrasyonu geleneksel üretim yöntemleriyle istenen mükemmellikte yapılamamaktadır. Katmanlı imalatla üretilen sensör entegreli parçalar geniş bir uygulama alanına sahiptir. Özellikle Kİ uygulamaları ile endüstri 4 çerçevesinde biyomedikal, otomotiv ve havacılık endüstrilerinde uygulanabilmesi ile kilit unsurların olabileceği yenilikçi bir çok alanda kullanım alanı oluşturabilecektir.

Thanks to the developing technology and softwares, analysis and optimization of the engineering parts can be done through computer programs nowadays. Softwares play an active role not only in analysis but also in reducing the material cost as a result of lightening the part with changes in design. Manufacturing methods and comparisons of these methods with each other have always been the subject of research. Choosing the methods of manufacturing of material has a great importance for enterprise. The loads and strength of the designed part under operating conditions are very important for the manufacturer. The pros and cons of both production methods which are additive manufacturing and machining have been investigated and these methods have been compared for the use of Pet-G material. A FDM (Fused Deposition Modeling) type 3D (three-dimensional) printer has been used in the additive manufacturing method and CNC Router (Computer Numerical Control Router) has been used for the machining method. A part design created in accordance with the mentioned manufacturing methods and its mechanical properties after its twice optimization have been examined and compared. After the optimizations, the targeted reduction on the mass of production has been achieved. After the optimization process, the sample has reduced by about 63% in volume and mass according to the design program. The mass of the sample, which is approximately 300 grams, has been reduced to 100 grams. As a result of the tests, it has been observed that the strength values of the samples manufactured by machining are higher.