2023年7月30日至8月4日，田小永教授一行赴英国贝尔法斯特参加国际复合材料大会，博士生黄一鸣、张曼玉、康友伟参会并做学术报告。

会议名称： The 23rd International Conference on Composite Materials (ICCM23)

会议时间： July 30-August 4, 2023

会议地点： ICC, Belfast, Northern Ireland, UK.

会议简介：The 23rd International Conference on Composites Materials (ICCM 23) will be held in Belfast, Northern Ireland, from July 30th to August 4th 2023. ICCM is the premier international conference in the field of composite materials and was first held in 1975 in the cities of Geneva and Boston. Since that time the conference has been held biennially in North American, European, Asian, Oceanic, and African cities. ICCM 23 will attract the leading researchers and practitioners, to report and exchange ideas on the latest developments in the advancement and exploitation of a wide range of composites materials and structures. The general themes of material development, testing, modelling, manufacturing and design will encompass a breadth of topics which will provide a comprehensive global snap-shot of the state-of-the-art. Plenary and keynote lectures from pre-eminent leaders in the field are planned, along with oral and poster presentations from an expected large delegation coming together in Belfast from all corners of the world. A number of site visits and an entertaining social programme are also planned.

报告信息：

Title: Integrated functional and structural mesh surface design and floating 3D printing using continuous fiber

Author: Youwei Kang, Tengfei Liu, Lingling Wu, Xiaoyong Tian

Abstract: Continuous carbon fiber composites have been extensively used in current aerospace and become an essential optional material for antenna reflector due to their combined excellent mechanical properties and good electrical conductivity. To meet the requirements of space exploration and the large-scale development of antennas, this study designed the structure of the mesh reflector in a function-oriented manner and fabricated it using a novel floating 3D printing technique with continuous carbon fiber reinforced polyamide (PA) composites. In this research, the 3D scanning, SEM, CT scan and other methods were utilized to systematically characterize and analyze the influence of process parameters including floating distance, printing speed, printing temperature and layer count on the forming quality of the reflector from a multi-scale perspective. The results showed that the floating distance should be taken as small as possible, the printing speed is 300~500 mm/min, the printing temperature is 255~265℃, and the layer count is at least 3 to achieve high surface quality. The electromagnetic reflectivity of the mesh reflector at S band with the frequency of 2.9~3.6 GHz was conducted in a free-space test system, and the influence law of structural parameters such as mesh size and shape on the function was also studied. The measured reflectivity can exceed 95% to meet the application requirements. A set of process-structure-function integrated design and manufacturing strategy based on floating 3D printing technique can help the development of reflector antenna.

Title: 3D PRINTING OF FULLY RECYCLABLE CONTINUOUS FIBER SELF-REINFORCED COMPOSITES AND THERMAL DEGRADATION MECHANISM

Author: Manyu Zhang, Xiaoyong Tian,Tengfei Liu, Lingling Wu

Abstract: A 3D printing approach for fully recyclable continuous fiber self-reinforced composites (CFSRCs) utilizing supercooled polymer melts was proposed. Continuous autologous fibers were added to the supercooled melt zone below the polymer matrix melting temperature avoiding fiber melting which successfully enlarged the processing temperature window. Through controlled supercooled melt conditions and heat transfer simulation, the supercooled melting temperature gradient control strategy for 3D printing CFSRCs were established. The processing temperature window enlarged from 2℃ to 30℃. Then the intrinsic connection among the printing temperature, crystallization behavior and mechanical properties of 3D printed CFSRCs were analysed. Furthermore, the interlaminar shear strength and transverse tensile property of CFSRCs were excellent than carbon fiber reinforced composites. Due to the fact that the self-reinforced composite reinforcement and matrix are homogeneous materials, the recuperation procedure does not require to separate fiber from the matrix. The continuous fiber self-reinforced PPS composites were mechanical ground and directly remanufactured by screw extrusion 3D printing. The recycling procedure were sped up and the thermal process of the material were reduced. Lastly, recycled self-reinforced composites showed no significant loss in tensile properties and even a little increase after multiple recycling cycles due to the melted PPS fiber in comparison with original PPS matrix. The thermal degradation mechanism of recycled composites were focused. Fully recyclable CFSRCs based on 3D printing potentially establish a closed-loop recycling strategy for space applicationsns.

会场合影（左图：田小永教授和参会学生合影，右图：参会代表和会议主席Falzon教授合影）

华人代表团合影