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Interfacial Bonding Mechanism and Mechanical Performance of continuous fiber Reinforced Composites in Additive Manufacturing

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Chinese Journal of Mechanical Engineering 2021年第1期34卷 131-141页

作者： Congze Fan Zhongde Shan Guisheng Zou Li Zhan Dongdong Yan State Key Laboratory of Advanced Forming Technology and Equipment Beijing 100044China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Nanjing University of Aeronautics and Astron autics Nanjing 210016China China Academy of Mach inery Science&Technology Group Co. Ltd.Beijing 100044China

The additive manufacturing of continuous fiber composites has the advantage of a high-precision and efficient forming process,which can realize the lightweight and integrated manufacturing of complex ***,many void defects exist between layers in the printing process of additive manufacturing;consequently,the bonding performance between layers is *** bonding neck is considered a key parameter for representing the quality of interfacial *** this study,the formation mechanism of the bonding neck was comprehensively ***,the influence of the nozzle and basement temperatures on the printing performance and bonding neck size was ***,CT scanning was used to realize the quantitative characterization of bonding neck parameters,and the reason behind the deviation of actual measurements from theoretical calculations was *** the nozzle temperature increased from 180 to 220℃,CT measurement showed that the bonding neck diameter increased from 0.29 to 0.34 mm,and the cross-sectional porosity reduced from 5.48%to 3.22%.Finally,the fracture mechanism was studied,and the influence of the interfacial bonding quality on the destruction process of the materials was *** conclusion,this study can assist in optimizing the process parameters,which improves the precision of the printing parts and performance between the layers.

关键词： 3D printing Thermoplastic resin continuous fiber Additive manufacturing

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3D/4D Printed Functional continuous fiber-reinforced Polymer Composites:Progress and Perspectives

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2023年第3期2卷 17-28页

作者： Ping Cheng Shixian Li Yong Peng Antoine Le Duigou Kui Wang Said Ahzi Key Laboratory of Traffic Safety on Track of Ministry of Education School of Traffic&Transportation EngineeringCentral South UniversityChangsha410075China ICube Laboratory-French National Center for Scientific Research University of StrasbourgStrasbourgF-67000France Institute de Research Dupty de Lôme Bionics GroupUniversity of South BritanyLorientF-56100France

In recent years,innovations in 3D/4D printing techniques for continuous fiber-reinforced polymer composites(CFRPCs)have opened new perspectives for the integrated design and manufacture of composites with customized *** paper reviews the current state of 3D/4D printed functional composites,including the materi-als,shape memory/changing effects,self-monitoring/healing behaviors,and challenges surrounding additive-manufactured functional ***,continuous fibers and matrices that provide functional roles are classified and discussed in detail.4D printed shape memory and changing CFRPCs can retain their original shapes from a designed shape upon exposure to different external stimuli,including heat,electricity,humidity,and multi-stimuli ***,self-monitoring of structural health is achieved through the piezore-sistive features of reinforced fibers in 3D printed ***,this review concludes with an outlook on the future research opportunities for 3D/4D printed functional CFRPCs.

关键词： 3D/4D printing continuous fiber Shape memory and changing Self-monitoring Self-healing

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3D Printing of Stretchable Strain Sensor Based on continuous fiber Reinforced Auxetic Structure

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2023年第2期2卷 11-18页

作者： Wanquan Yan Xiaoyong Tian Daokang Zhang Yanli Zhou Qingrui Wang State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an710049China

Stretchable strain sensors play a key role in motion detection and human-machine interface functionality,and deformation ***,their sensitivity is often limited by the Poisson effect of elastic *** this study,a stretchable strain sensor based on a continuous-fiber-reinforced auxetic structure was proposed and fabricated using a direct ink writing(DIW)3D printing *** application of multi-material DIW greatly simplifies the fabrication process of a sensor with an auxetic structure(auxetic sensor).The auxiliary auxetic struc-ture was innovatively printed using a continuous-fiber-reinforced polydimethylsiloxane composite(fiber-PDMS)to balance the rigidity and flexibility of the *** increase in stiffness enhances the negative Poisson’s ratio effect of the auxetic structure,which can support the carbon nanotube-polydimethylsiloxane composite(CNT-PDMS)stretchable sensor to produce a significant lateral expansion when *** is shown that the structural Poisson’s ratio of the sensor decreased from 0.42 to−0.33 at 20%tensile strain,and the bidirectional tensile strain increases the sensor sensitivity by 2.52 times(gage factor to 18.23).The fiber-PDMS composite maintains the excellent flexibility of the matrix *** auxetic sensor exhibited no structural damage af-ter 150 cycles of tension and the signal output exhibited high *** addition,this study demonstrates the significant potential of auxetic sensors in the field of deformation control.

关键词： 3D printing Stretchable sensor Auxetic structure continuous fiber Sensitivity Deformation control

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Geometric Accuracy and Energy Absorption Characteristics of 3D Printed continuous Ramie fiber Reinforced Thin-Walled Composite Structures

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Chinese Journal of Mechanical Engineering 2023年第6期36卷 147-158页

作者： Kui Wang Hao Lin Antoine Le Duigou Ruijun Cai Yangyu Huang Ping Cheng Honghao Zhang Yong Peng Key Laboratory of Traffic Safety on Track of Ministry of Education School of Traffic and Transportation EngineeringCentral South UniversityChangsha 410075China Institute de Research Dupty de Lôme Bionics GroupUniversity of South BritanyLorient F-56100France ICUBE Laboratory-CNRS University of StrasbourgStrasbourg 67000France Key Laboratory of High Efficiency and Clean Mechanical Manufacture(Ministry of Education) School of Mechanical EngineeringShandong UniversityJinan 250061China.

The application of continuous natural fibers as reinforcement in composite thin-walled structures offers a feasible approach to achieve light weight and high strength while remaining environmentally *** addition,additive manufacturing technology provides a favorable process foundation for its *** this study,the printability and energy absorption properties of 3D printed continuous fiber reinforced thin-walled structures with different configurations were *** results suggested that a low printing speed and a proper layer thickness would mitigate the printing defects within the *** printing geometry accuracy of the structures could be further improved by rounding the sharp corners with appropriate *** study successfully fabricated structures with vari-ous configurations characterized by high geometric accuracy through printing parameters optimization and path ***,the compressive property and energy absorption characteristics of the structures under quasi-static axial compression were evaluated and *** was found that all studied thin-walled structures exhibited progressive folding deformation patterns during *** particular,energy absorption process was achieved through the combined damage modes of plastic deformation,fiber pullout and ***,the com-parison results showed that the hexagonal structure exhibited the best energy absorption *** study revealed the structure-mechanical property relationship of 3D printed continuous fiber reinforced composite thin-walled structures through the analysis of multiscale failure characteristics and load response,which is valuable for broadening their applications.

关键词： Additive manufacturing continuous fiber Biocomposite Thin-walled structure Geometric accuracy Energy absorption

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