Experimental Analysis on Delamination Damage by Acoustic Emission in High Speed Drilling of Carbon Fiber Reinforced Plastics

2013 ◽  
Vol 589-590 ◽  
pp. 287-292 ◽  
Author(s):  
Xiao Jiang Cai ◽  
Sheng Qin ◽  
Qing Long An ◽  
Hong Zhou Zhang ◽  
Shu Han ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Carbon Fiber ◽  
Thrust Force ◽  
Fiber Reinforced ◽  
Great Resistance ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced ◽  
Delamination Damage

Carbon fiber reinforced plastics (CFRP) has increasing applications in aerospace and other fields, due to low density, high strength, high stiffness, great resistance to corrosion, etc. Although, delamination damages in drilling holes for assembly influence the final characteristics of CFRP components. This paper presents an experimental investigation to analyze delamination damage, in which acoustic emission and thrust force are monitored during drilling CFRP laminates to clarify the relationship between AE signals and delamination damages. The results show that delamination damage has close correlation with thrust force and acoustic emission energy. AE root mean square (rms) is recommended to be selected as AE signal parameter. Abrupt peak feature of AE rms can be used as a dependable trigger for delamination monitoring. The number of abrupt pulses of AE rms can be counted online to predict the degree of delamination damages, based on which delaminations can be monitored and controlled online.

CFRP Drilling with Brazed Diamond Core Drill

2011 ◽  
Vol 175 ◽  
pp. 27-32 ◽  
Author(s):  
Juan Mu ◽  
Jiu Hua Xu ◽  
Yan Chen ◽  
Yu Can Fu
Keyword(s):  
Carbon Fiber ◽  
Thrust Force ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Drilling Quality ◽  
Near Net Shape ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

Despite the facts that carbon fiber reinforced plastics (CFRP) components are mostly produced near net shape, machining, especially drilling is often required in order to bring the component into dimensional requirements and prepare it for assembly. Rapid drill wear and serious machining defects are the key problems in CFRP drilling, and employing proper drill is an effective way to solve these problems. In this paper, tests of the brazed diamond core drill are presented and the related issues, such as the thrust force, the drilling quality and the drill wear are studied.

Experimental Investigation on the Tilt Helical Milling of Carbon Fiber Reinforced Plastics (CFRP)

2018 ◽  
Vol 792 ◽  
pp. 173-178
Author(s):  
Qiang Wang ◽  
Yong Bo Wu ◽  
Dong Lu ◽  
Teruo Bitoh ◽  
Ming Feng
Keyword(s):  
Carbon Fiber ◽  
Thrust Force ◽  
New Method ◽  
Helical Milling ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Delamination Factor ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

Carbon fiber reinforced plastics (CFRP) has been widely used in various aircraft structural components. However, it is difficult for conventional methods such as drilling and helical milling to meet the requirements on high quality and efficient holes creation. Hence a so-called tilt helical milling (THM) method has been proposed. This new method is performed by replacing the revolving motion of the tool in conventional helical milling (CHM) with a conical pendulum motion, in which the tool axis is tilted towards the hole axis at a certain angle. As a step toward the establishment of the new method, in this work, the fundamental drilling characteristics of CFRP by the THM is elucidated by experimentally investigating the effects of tilt angle on thrust force and delamination factor. The obtained experimental results demonstrated that thrust force and delamination factor can be reduced with THM technique. In addition, THM can achieve better hole surface finish than CHM.

Parametric investigation of rotary ultrasonic drilling of carbon fiber reinforced plastics

2017 ◽  
Vol 232 (5) ◽  
pp. 540-554 ◽  
Author(s):  
Saeid Amini ◽  
Mohammad Baraheni ◽  
Alireza Mardiha
Keyword(s):  
Carbon Fiber ◽  
Thrust Force ◽  
Machining Parameters ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Ultrasonic Drilling ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced ◽  
Rotary Ultrasonic Drilling

Carbon fiber reinforced plastics are used in various industrial applications for their excellent properties. Rotary ultrasonic drilling is the new machining process used to drill holes on fiber-reinforced plastics and has been attracting increased attention in recent years. Dimensional tolerances are very important in machining of carbon fiber reinforced plastics. Additionally, diamond core drills are simultaneously drilling and grinding fiber reinforced plastics. This paper aims to investigate thrust force and dimensional tolerances including roundness and cylindricity in rotary ultrasonic drilling of carbon fiber reinforced plastics using diamond core drill. To this end, a proper ultrasonic system for a core drill in ABAQUS is designed and fabricated. Thrust force in rotary ultrasonic drilling when compared to conventional drilling reduced by up to 30%. Besides, roundness and cylindricity decreased by up to 80% and 72%, respectively. Afterwards, analysis of variance demonstrated that vibration is more influential than other machining parameters in order to improve the hole accuracy. That is, obtained exponential regression models predict roundness and cylindricity through machining parameters with high accuracy. Feed rate of 30 mm/min and spindle speed of 1400 r/min by exerting vibration on the tool is considered to be the optimized condition.

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