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Feasibility study of wave-motion milling of carbon fiber reinforced plastic holes

International Journal of Extreme Manufacturing 2021年第1期3卷 86-96页

作者： Deyuan Zhang Zhenyu Shao Daxi Geng Xinggang Jiang Yihang Liu ZehuaZhou Shaomin Li School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191People’s Republic of China The Institute of Bionic and Micro-Nano Systems Beihang UniversityBeijing 100191People’s Republic of China Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing 100191People’s Republic of China

carbon fiber reinforced plastic(CFRP)has been applied in aeronautics,aerospace,automotive and medical industries due to its superior mechanical ***,due to its difficult-to-cut characteristic,various damages in twist drilling and chip removal clog in core drilling could happen,inevitably reducing hole quality and hole-manufacturing *** paper proposes the wave-motion milling(WMM)method for CFRP hole-manufacturing to improve hole *** paper presents a motion path model based on the kinematics of the WMM *** wave-motion cutting mode in WMM was analyzed ***,comparison experiments on WMM and conventional helical milling(CHM)of CFRP were carried out under dry *** results showed that the hole surface quality of the CFRP significantly improved with a decrease of 18.1%–36%of Ra value in WMM compared to *** exerted a significantly weaker thrust force than that of CHM with a reduction of 12.0%–24.9%and 3%–7.7%for different axial feed per tooth and tangential feed per tooth,***,the hole exit damages significantly decreased in *** average tear length at the hole exit in WMM was reduced by 3.5%–29.5%and 35.5%–44.7%at different axial feed per tooth and tangential feed per tooth,***,WMM significantly alleviated tool *** experimental results suggest that WMM is an effective and promising strategy for CFRP hole-manufacturing.

关键词： carbon fiber reinforced plastic wave-motion milling cutting force surface integrity

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Enhanced ultrasonic total focusing imaging of CFRP corner with ray theory-based homogenization technique

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Chinese Journal of Aeronautics 2023年第1期36卷 434-443页

作者： Zhongbing LUO Jinli KANG Huanqing CAO Li LIN NDT&E Laboratory Dalian University of TechnologyDalian 116024China Shenzhen Key Laboratory of Smart Sensing and Intelligent Systems Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

Ultrasonic testing is effective in defect characterization and quality assurance of carbon fiber reinforced plastic(CFRP) components in the aerospace industry. Due to the coupling between complex shape and elastic anisotropy, the Phased Array Ultrasonic Testing(PAUT) and time-based Total Focusing Method(TFM) face significant challenges in the calculation of wave propagation. A wave velocity distribution model is established for a multidirectional convex corner of CFRP based on a homogenization theory and the above coupling effects are also incorporated. A ray-tracing method is proposed based on Dijkstra’s shortest path search algorithm. The predicted time of flight ensures that this technique, the homogenized TFM, could synthesize a high-quality focused image by post-processing on the full matrix capture data. Experiments on a laminate with three φ1.5 mm Side-Drilled Holes(SDHs) in different circumferential directions confirm a successful homogenized TFM imaging that all SDHs can be effectively detected. As compared to the isotropic scenario, the maximum positioning error is reduced to 0.12, 0.08, and 0.38 mm, and the Signal-to-Noise Ratios(SNRs) are increased by 2.1, 1.1, and 11.8 dB, respectively. It is suggested that the ray-tracing assisted TFM technique can effectively improve the imaging of corners in CFRP components.

关键词： carbon fiber reinforced plastic Complex shape Homogenization Imaging Time of Flight(TOF)

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Multi-Scale Design and Optimization of Composite Material Structure for Heavy-Duty Truck Protection Device

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 1961-1980页

作者： Yanhui Zhang Lianhua Ma Hailiang Su Jirong Qin Zhining Chen Kaibiao Deng School of Mechanical and Automotive Engineering Guangxi University of Science and TechnologyLiuzhou545006China Commercial Vehicle Technology Center Dongfeng Liuzhou Automobile Co.Ltd.Liuzhou545005China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510641China

In this paper,to present a lightweight-developed front underrun protection device(FUPD)for heavy-duty trucks,plain weave carbon fiber reinforced plastic(CFRP)is used instead of the original high-strength ***,the mechanical and structural properties of plain carbon fiber composite anti-collision beams are comparatively analyzed from a multi-scale *** studying the design capability of carbon fiber composite materials,we investigate the effects of TC-33 carbon fiber diameter(D),fiber yarn width(W)and height(H),and fiber yarn density(N)on the front underrun protective beam of carbon fiber *** on the investigation,a material-structure matching strategy suitable for the front underrun protective beam of heavy-duty trucks is ***,the composite material structure is optimized by applying size optimization and stack sequence optimization methods to obtain the higher performance carbon fiber composite front underrun protection beam of commercial *** results show that the fiber yarn height(H)has the greatest influence on the protective beam,and theH1matching scheme for the front underrun protective beamwith a carbon fiber composite structure exhibits superior *** proposed method achieves a weight reduction of 55.21% while still meeting regulatory requirements,which demonstrates its remarkable weight reduction effect.

关键词： Structural optimization front underrun protection device carbon fiber reinforced plastic multi-scale model lightweight design

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