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《Journal of Nantong University(Natural Science Edition)》 2013-04
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Effects of Exit Suppressed Mechanism on Delamination in Drilling Composite Materials Using Core Drill

TSAO Chung-chen;Department of Mechatronic Engineering,Ta Hwa University of Science and Technology;  
Composite Material is widely used in the aerospace,defense,chemical and transportation industries,but it is both liked and hated because of excellent mechanical characteristics(high strength-to-weight ratio,high fracture toughness and excellent corrosion resistance) and machined defects(delamination,fibre pull-out,interlaminar cracks or thermal degradation).To the manufacture of composite materials,the drilling is an important process in hole-making,and the cost of drill bits accounts for the largest amount of money spent in all cutting tools.From the viewpoint of cost and productivity,it is important to set up a mathematical modeling of drilling for delamination-free composite materials.Because the delamination in the drilling is induced mainly by the thrust force,it can be avoided when reducing the thrust force at the drill exit of the workpiece.In this paper,according to linear elastic fracture mechanics(LEFM) and energy conservation,an attempt is made to deduce the thrust force in drilling composite materials using core drill with exit suppressed mechanism,and the obtained theoretical results agree well with the practical experience.However,the research of delamination-free hole still needs to accept vigorous challenges and proof in the drilling of composite materials in the future.
【Fund】: The National Science Council in Taiwan(NSC-100-2221-E-233-005)
【CateGory Index】: TB33
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