基于三胞模型的2.5D编织复合材料力学性能研究

doi:10.11896/cldb.20090151

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Abstract In order to accurately predict the longitudinal mechanical properties of 2.5D braided composites, this work takes 2.5D equal thickness and va-riable thickness braided composites as the research object. Based on the microstructure characterization results, whole cell and triple-cell models of 2.5D equal thickness and variable thickness braided composites considering the effects of surface extrusion and yarn dislocation and slip is established. Based on the established whole cell and triple-cell geometric models, the numerical simulation analysis of 2.5D braided composites with equal thickness and variable thickness is carried out based on the progressive damage method, the longitudinal stiffness and strength of different structures are predicted, the damage propagation process and damage behavior of different structures are simulated, which is compared with the experimental results. The results show that the whole cell and triple-cell model considering the effects of surface extrusion and yarn dislocation slip can more accurately predict the mechanical properties of 2.5D braided composites; the numerical simulation results of the triple-cell model can more accurately reflect the damage propagation process of 2.5D braided composites and more comprehensively characterize the da-mage behavior of 2.5D braided composites.

Key words： 2.5D braided composite material whole cell model triple-cell model damage behaviors mechanical properties

Published: 25 November 2021 Online: 2021-12-13

CLC number:

TB322

Fund:This work was financially supported by National Science and Technology Major Project (2017-Ⅳ-0007-0044).

About author: Siyu Zhao,master of Nanjing University of Aeronautics and Astronautics, is mainly engaged in the research of advanced composite structural strength design technology.
Weidong Wen, professor and doctoral supervisor of Nanjing University of Aeronautics and Astronautics.From 1985 to now, he has been engaged in teaching and scientific research on structure, strength and vibration of aeronautical power in Nanjing University of Aeronautics and Astronautics. He has successively undertaken the teaching of Basic Finite Element Method, Aeroengine Strength, Elastic Mechanics, Specialized English, Mechanical Vibration Foundation for Undergraduates, and Advanced Structural Strength Theory, Modal Analysis and Testing, Mechanical Vibration and other courses for postgraduates, recruited and trained 6 postdoctoral students, more than 30 doctoral students and more than 70 master students. He has presided over and completed more than 40 important projects, including National Natural Science Foundation, Aviation Fund, National Defense Aero-engine Pre-research Project and National Defense Basic Pre-research Project, and has undertaken a number of important research projects. He has published more than 300 academic papers in core journals and international conferences at home and abroad, including more than 150 SCI and EI papers. He edited one textbook of professional English, participated in the compilation of structural design criteria for turbojet and turbofan engines, and won four provincial and ministerial level science and technology progress awards and one first prize of Jiangsu provincial teaching and learning achievement award.

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	ZHAO Siyu
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Cite this article:

ZHAO Siyu,WEN Weidong,ZHOU Yu. Investigation of Mechanical Properties of 2.5D Braided Composites Based on Triple-cell Model[J]. Materials Reports, 2021, 35(22): 22178-22192.

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http://www.mater-rep.com/EN/10.11896/cldb.20090151 OR http://www.mater-rep.com/EN/Y2021/V35/I22/22178

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