不同针刺工艺的针刺复合材料面内拉伸强度分析

doi:10.11901/1005.3093.2022.171

材料研究学报

2023, Vol. 37

Issue (1): 21-28 DOI: 10.11901/1005.3093.2022.171

研究论文

本期目录 | 过刊浏览

不同针刺工艺的针刺复合材料面内拉伸强度分析

戚云超¹, 方国东²(

), 周振功², 梁军³(

)

^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

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

QI Yunchao¹, FANG Guodong²(

), ZHOU Zhengong², LIANG Jun³(

)

^1.AVIC Chengdu Aircraft Industrial (Group) CO., LTD, Chengdu 610091, China
^2.National Key Laboratory of Special Environmental Composite Technology, Harbin Institute of Technology, Harbin 150080, China
^3.School of Astronautics, Beijing Institute of Technology, Beijing 100081, China

引用本文:

戚云超, 方国东, 周振功, 梁军. 不同针刺工艺的针刺复合材料面内拉伸强度分析[J]. 材料研究学报, 2023, 37(1): 21-28.
Yunchao QI, Guodong FANG, Zhengong ZHOU, Jun LIANG. In-plane Tensile Strength for Needle-punched Composites Prepared by Different Needling Processes[J]. Chinese Journal of Materials Research, 2023, 37(1): 21-28.

全文: PDF(8596 KB) HTML

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。

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

Abstract：

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 in-plane tensile strength of composites with different needling processes, and to guide the design of the needle punching preforms.

Key words： composite carbon fiber needled needling processes tensile strength volume reduction coefficient theoretical model

收稿日期: 2022-03-25

ZTFLH:

TB332

基金资助:国家自然科学基金(11732002);国家自然科学基金(12090034);黑龙江省自然科学基金(YQ2021A004)

作者简介: 戚云超，男，1993年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2022.171 或 https://www.cjmr.org/CN/Y2023/V37/I1/21

图1 针刺预制体结构示意图[14]

表1 针刺复合材料制备工艺和拉伸强度

图2 拉伸试件的尺寸和形状

图3 针刺复合材料的拉伸试验和拉伸试件的断口

图4 工艺不同的针刺复合材料的应力-应变曲线

图5 针刺工艺不同的拉伸试件破坏时的SEM形貌以及工艺1试件和工艺5试件的断口

图6 两种不同的针刺区域

图7 偏转纤维厚度方向的等效长度

图8 针刺复合材料的模型

Process id	Volume reduction coefficient $α$	CV
1	0.231	6.60%
2	0.253	7.52%
3	0.294	6.82%
4	0.312	8.04%
5	0.381	6.95%
6	0.41	7.00%

表2 针刺工艺不同材料的体积折减系数

图9 不同i值的模型预测强度

图10 不同工艺模型的计算值与实验值以及计算值与实验值的相对误差

图11 无损伤和含损伤的无纬布纤维的断裂

图12 断裂纤维的根数与体积折减系数的关系

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