Microstructure-Level Machining Simulation of Carbon Nanotube Reinforced Polymer Composites-Part II: Model Interpretation and Application  

Oleh:

Dikhit, A. ; Samuel, J. ; DeVor, R. E. ; Kapoor, S. G.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Journal of Manufacturing Science and Engineering vol. 130 no. 3 (Jun. 2008), page 031115.
Topik: Carbon Nanotube Composites; Machining Model

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ93.11 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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The microstructure-level finite element machning model developed in Part I of this paper is used to perform a detailed analysis of the failure mechanisms that occur while machining the carbon nanotube (CNT) reinforced polycarbonate composties. The chip formation in plain polycarbonate (PC) is seen to be influenced by the ductile failure mode. For the composite containing 1.75% by weight of CNTs (Composite A), the polymer fails in the ductile mode. The presence of CNTs is seen to result in CNTs protruding from the machined surface and subsruface damage. The low thermal condutivity of the polymer phase is seeen to result in the fromation of adiabatic shear bands in plain PC and Composite A. As the CNT loading is increased to 5% by weight, the failure in the polymer phase is seen to be predominantly brittle in nature. The presence of the larger percentage of CNTs is also seen to offset the fromation of adiabatic shear bands. The machining model has also been used to successfully predict the machining behavior of CNT composites with tailored microstructures. Simulation experiments with varying CNT alignement, aspect ration, percentage loading, and cutting velocity were conduted to study the effects of these factors on cutting forces. The results show that the machining model in combination with the material model is an effective tool to design CNT composites with emphasis both on the mechnaical properties and machinability.

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