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Finite Element Modeling Of Machining Particle Reinforced Aluminum Metal Matrix Composites

Oluşturulma Tarihi: 15-08-2018

Niteleme Bilgileri

Tür: Tez

Alt Tür: Yüksek Lisans Tezi

Yayınlanma Durumu: Yayınlanmamış

Dosya Biçimi: PDF

Dil: İngilizce

Konu(lar): TEKNOLOJİ, Makina mühendisliği ve makinalar,

Yazar(lar): Rake, Nakka Lotfy (Yazar),

Emeği Geçen(ler): Kılıç, Sadık Engin (Danışman),

Anahtar Kelimeler

 Finite Element Modeling, orthogonal cutting, particle reinforced aluminum metal matrix composite, heterogeneous material, tool-workpiece interaction. 


Özet

Metal matrix composites (MMCs) have become key materials in many technical fields, including automotive, aerospace and nuclear power plants. In most of these applications, machining processes are required to achieve the desired characteristics of the final product. Therefore, it is important to study the machining of MMCs and develop process models to understand their behavior during machining operations.   Based on process models, machining quality and cost can be improved by optimizing the cutting conditions for specific MMCs. As a step towards this goal, finite element modeling (FEM) is used to study the machining of particulate aluminum metal matrix composites (p-Al-MMCs). The selected matrix material was aluminum alloy A359 reinforced with silicon carbide (SiC) particles having a diameter of 20 μm with a volume fraction of 20%.  Orthogonal cutting of p-Al-MMC has been studied by three different approaches. In the first approach attempt has been made to implement an equivalent homogeneous material model (EHM), while in the second and third approaches p-Al-MMC is modeled as a two-phase heterogeneous material. The second and third approaches rely on periodic square and periodic hexagonal distributions of reinforcement particles, respectively. The interaction between matrix/cutting tool, matrix/reinforcement and reinforcement/ cutting tool has been considered.  The results of FE simulations are compared with the experimental data available in the literature. The results revealed that, EHM models calibrated using high strain rate tests may not be able to give good predictions of cutting forces and they should be re-calibrated for machining simulations. The results also revealed that, by modeling p-MMCs as a heterogeneous material the accuracy of cutting force predictions can be improved significantly.  


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