Ultrasonic-Assisted Drilling of Glass Fiber Reinforced Composites

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Forouzan, Ali | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39144 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Akbari, Javad
Abstract:
The fiber-reinforced composite materials possess advantage for structural purpose in various industries. Delamination is recognized as one of the major causes of damage during drilling of fiber reinforced composites, which not only reduces the structural integrity, but also has the potential for long-term performance deterioration. It is difficult to produce precise quality holes with high efficiency by conventional drilling method. Drilling is frequently applied in production cycle while the anisotropy and nonhomogeneity of composite materials affect the chip deformation and machining behavior during drilling. In this thesis, a new non-traditional drilling technology is presented for solve this problems. It is Ultrasonic-assisted drilling where high-frequency and low amplitude vibrations are superimposed on the movement of cutting tools. From the drilling experiments, it was found that precise quality holes and high efficiency could be obtained by this new drilling method but not lower delamination was measured.
Keywords:
Composite Materials ; Delamination ; Hole Drilling ; Ultrasonic-Vibration ; Glass/Epoxy Composite

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