不同针刺工艺的针刺复合材料面内拉伸强度分析  

In-plane Tensile Strength for Needle-punched Composites Prepared by Different Needling Processes

作　　者：戚云超 方国东[2] 周振功[2] 梁军 QI Yunchao;FANG Guodong;ZHOU Zhengong;LIANG Jun(AVIC Chengdu Aircraft Industrial(Group)CO.,LTD,Chengdu 610091,China;National Key Laboratory of Special Environmental Composite Technology,Harbin Institute of Technology,Harbin 150080,China;School of Astronautics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]航空工业成都飞机工业(集团)有限责任公司,成都610091 [2]哈尔滨工业大学特种环境复合材料技术国家级重点实验室,哈尔滨150080 [3]北京理工大学宇航学院,北京100081

出　　处：《材料研究学报》2023年第1期21-28,共8页Chinese Journal of Materials Research

基　　金：国家自然科学基金(11732002,12090034);黑龙江省自然科学基金(YQ2021A004)。

摘　　要：6种针刺工艺不同的碳纤维增强树脂基复合材料,其面内拉伸强度随着针刺密度和针刺深度的增大而降低,针刺处纤维的断裂使材料内的缺陷失稳扩展和面内纤维断裂,进而使材料整体拉伸失效。根据面内拉伸实验结果和纤维累计损伤理论并引入纤维体积折减系数,建立了分析针刺复合材料面内拉伸强度的理论模型。这个模型的预测结果与实验结果相符,并发现断裂纤维簇的个数与体积折减系数相关。用该模型可预报不同针刺工艺复合材料的面内拉伸强度,并指导设计针刺复合材料的预制体。The in-plane tensile strength of six carbon fiber reinforced resin-based composites with different needle punching processes decreases with the increase of needle punching density and needle punching depth.The fiber fracture at the needle punching regions can make the defects instability propagation in the material,which can induce the tensile failure of material.Based on the in-plane tensile test results and fiber cumulative damage theory,a theoretical model for analyzing in-plane tensile strength of needle punched composites are established by introducing fiber volume reduction coefficient.The prediction results of this model are consistent with the experimental results.It is found that the number of broken fiber clusters is related to the volume reduction coefficient.The model can be used to predict the inplane tensile strength of composites with different needling processes,and to guide the design of the needle punching preforms.

关 键 词：复合材料 碳纤维针刺 针刺工艺 拉伸强度 体积折减系数 理论模型 

分 类 号：TB332[一般工业技术—材料科学与工程]