Residual tensile strength monitoring of drilled composite materials by acoustic emission |
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| Affiliation: | 1. Department of Precision Mechanics, Chuo University, 1-13-27 Kasuga, Bunkyo, Tokyo 112-8551, Japan;2. Department of Earth and Environmental Engineering, Columbia University, 500W 120th Street, New York, NY 10027, USA;3. International Center for Applied Mechanics, SV Laboratory, School of Aerospace Xi׳an Jiaotong University, Xi׳an 710049, China;1. Department of Civil Engineering, Necmettin Erbakan University, 42140 Konya, Turkey;2. Meram Vocational School, Necmettin Erbakan University, 42140 Konya, Turkey;1. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China;2. Machining and Condition Monitoring Group, Faculty of Engineering, University of Nottingham, NG7 2RD, UK |
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| Abstract: | Drilling results in damage such as delamination and matrix cracking around the hole and might ultimately causes degradation in the residual tensile strength of the drilled components. The damage induced during the drilling of composites can be detrimental to the mechanical behavior of the composite products. In this work, the effects of machining parameters (feed rate and cutting speed) and drill point angle on thrust force, the adjusted delamination factor and residual tensile strength are investigated. The Taguchi technique for the design of experiments was employed to analyze the thrust force, adjusted delamination factor and residual tensile strength of woven glass/resin epoxy. The results show that feed rate and drill point angle are the most important parameters. During tensile testing of drilled laminates, acoustic emission (AE) events were recorded. By feature extraction of AE time domain parameters, the suitable parameter for detecting the characteristics of thrust force and tensile force were determined. The AE mean power (MP) and cumulative count correlated well with thrust force and tensile force, respectively. |
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