3 boyutlu yazıcı ile üretilen sandviç yapıların statik ve dinamik yük altında davranışlarının incelenmesi
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Dosyalar
Tarih
2020
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Bursa Teknik Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Son zamanlarda, yüksek performanslı mühendislik uygulamaları için hafif sandviç yapıların tasarım ve üretiminde kafes çekirdek yapılarının sunduğu potansiyele ilgi artmaktadır. Sandviç yapılar günümüzde havacılık, deniz, otomobil, yel değirmeni ve inşaat endüstrisi sektörlerinde, özellikle yüksek eğilme sertliği, ısı yalıtımı ve yüksek enerji emme kabiliyetleri gibi mükemmel çok işlevli özellikleri nedeniyle yoğun olarak kullanılmaktadır. Sandviç yapıların birçok alanda kullanılıyor olması hafif, yüksek enerji absorpsiyonlu ve ağır hizmet tipi sandviç malzemelerin geliştirilmesi ve uygulanması için mükemmel bir fırsat sunmaktadır. Eklemeli İmalat yöntemi, imal edilmesi imkansız olan karmaşık geometrili çekirdeklerin üretimine olanak sağlamıştır. Sandviç yapıların eklemeli imalat yöntemi ile imal edilmesi, geleneksel yöntemler ile imal edilmiş altıgen bal peteği veya köpük çekirdekli geleneksel sandviç yapılara göre birçok önemli avantaj sağlamaktadır. Tez kapsamında 4 farklı Sandviç yapı modeli tasarlanmıştır. Sandviç yapılar Bal peteği, Girintili, Yıldız ve Üçgen olarak Solidworks programında tasarlanmıştır. Tasarlanan model boyutları Basma ve Çarpışma testleri için 40x40x20 mm, Üç nokta eğme testi için 130x20x20 mm boyutlarındadır. Hazırlanan modellerin dataları üç boyutlu yazıcıya aktarılmak üzere STL formatına dönüştürülmüştür. Modellerin datalarını 3 boyutlu yazıcıya aktarmak için ara program olan Cura yazılımı kullanılmıştır. Sandviç yapıların imalatı için Ultimaker 3 extended FDM tipi 3 boyutlu yazıcı kullanılmıştır. Sandviç yapılar Termoplastik poliüretan (Ultimaker TPU 95 A) malzemeden imal edilmiştir. Malzeme mekanik özelliklerini belirleyebilmek için çekme test numuneleri imal edilmiştir. 3 adet imal edilen çekme test numuneleri Shimadzu AG-X plus cihazında çekme testleri gerçekleştirilmiştir. Basma ve üç nokta eğme testleri için imal edilmiş modeller yine aynı cihazda testlere tabi tutulmuştur. Çarpışma testleri için sonlu elemanlar yöntemi kullanılmıştır. Sonlu elemanlar analizinin gerçekleştirilmesinde ise HyperWorks paket programında bulunan, HyperMesh, HyperCrash, HyperView, HyperGraph, ve RADIOSS yazılımlarından yararlanılmıştır. Modellere ait darbe enerjileri ve enerji emilim miktarları elde edilmiştir. Yapılan testler sonucunda elde edilen sonuçlar karşılaştırmalı olarak incelenmiştir. Basma, üç nokta eğme ve çarpışma test sonuçlarına göre en iyi statik ve dinamik özellikleri sergileyen model berlirlenmiştir. Elde edilen sonuçlar neticesinde Girintili sandviç yapı modelinin en iyi mekanik özelllikler gösteren model olduğu ortaya konmuştur.
Recently, there has been an increasing interest in the potential of lattice core structures in the design and manufacture of lightweight sandwich structures for high performance engineering applications. Sandwich structures are used extensively today in the aviation, marine, automobile, windmill and construction industry sectors due to their excellent multifunctional properties, especially high bending stiffness, thermal insulation and high energy absorption capabilities. The fact that sandwich structures are used in many areas provides an excellent opportunity for the development and application of lightweight, high energy absorption and heavy duty sandwich materials. Additive Manufacturing method has enabled the production of cores with complex geometries that are impossible to fabricate. The production of sandwich structures by the additive manufacturing method provides many important advantages over traditional sandwich structures made of hexagonal honeycomb or foam core produced with traditional methods. Within the scope of the thesis, 4 different Sandwich structure models are designed. Sandwich structures are designed in the Solidworks program as Honeycomb, Re-entrant, Star and Triangle. The designed model dimensions are 40x40x20 mm for Compression and Impact tests, 130x20x20 mm for Three-point bending test. The data of the prepared models were converted to STL format to be transferred to the three-dimensional printer. Cura software, which is an intermediate program, was used to transfer the data of the models to the 3D printer. Ultimaker 3 extended FDM type 3D printer was used to manufacture sandwich structures. Sandwich structures are made of Thermoplastic polyurethane (Ultimaker TPU 95 A) material. Tensile test samples were produced to determine the mechanical properties of the material. Tensile tests were carried out on Shimadzu AG-X plus device, which was produced in 3 pieces. Models manufactured for compression and three-point bending tests were also tested on the same device. Finite element method was used for impact tests. In the finite element analysis, HyperMesh, HyperCrash, HyperView, HyperGraph, and RADIOSS software that are included in the HyperWorks package program were used. İmpact energies and energy absorption amounts of the models were obtained. The results obtained as a result of the tests were examined comparatively. According to compression, three-point bending and impact test results, the model that exhibits the best static and dynamic properties has been identified. As a result of the obtained results, it has been revealed that the Re-entrant sandwich structure model is the model with the best mechanical properties.
Recently, there has been an increasing interest in the potential of lattice core structures in the design and manufacture of lightweight sandwich structures for high performance engineering applications. Sandwich structures are used extensively today in the aviation, marine, automobile, windmill and construction industry sectors due to their excellent multifunctional properties, especially high bending stiffness, thermal insulation and high energy absorption capabilities. The fact that sandwich structures are used in many areas provides an excellent opportunity for the development and application of lightweight, high energy absorption and heavy duty sandwich materials. Additive Manufacturing method has enabled the production of cores with complex geometries that are impossible to fabricate. The production of sandwich structures by the additive manufacturing method provides many important advantages over traditional sandwich structures made of hexagonal honeycomb or foam core produced with traditional methods. Within the scope of the thesis, 4 different Sandwich structure models are designed. Sandwich structures are designed in the Solidworks program as Honeycomb, Re-entrant, Star and Triangle. The designed model dimensions are 40x40x20 mm for Compression and Impact tests, 130x20x20 mm for Three-point bending test. The data of the prepared models were converted to STL format to be transferred to the three-dimensional printer. Cura software, which is an intermediate program, was used to transfer the data of the models to the 3D printer. Ultimaker 3 extended FDM type 3D printer was used to manufacture sandwich structures. Sandwich structures are made of Thermoplastic polyurethane (Ultimaker TPU 95 A) material. Tensile test samples were produced to determine the mechanical properties of the material. Tensile tests were carried out on Shimadzu AG-X plus device, which was produced in 3 pieces. Models manufactured for compression and three-point bending tests were also tested on the same device. Finite element method was used for impact tests. In the finite element analysis, HyperMesh, HyperCrash, HyperView, HyperGraph, and RADIOSS software that are included in the HyperWorks package program were used. İmpact energies and energy absorption amounts of the models were obtained. The results obtained as a result of the tests were examined comparatively. According to compression, three-point bending and impact test results, the model that exhibits the best static and dynamic properties has been identified. As a result of the obtained results, it has been revealed that the Re-entrant sandwich structure model is the model with the best mechanical properties.
Açıklama
Anahtar Kelimeler
Makine Mühendisliği, Mechanical Engineering
