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

doi:10.11901/1005.3093.2022.171

Chinese Journal of Materials Research

2023, Vol. 37

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

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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

Cite this article:

QI Yunchao, FANG Guodong, ZHOU Zhengong, LIANG Jun. In-plane Tensile Strength for Needle-punched Composites Prepared by Different Needling Processes. Chinese Journal of Materials Research, 2023, 37(1): 21-28.

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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

Received: 25 March 2022

ZTFLH:

TB332

Fund: National Natural Science Foundation of China(11732002);National Natural Science Foundation of China(12090034);Natural Science Foundation of Heilongjiang Province(YQ2021A004)

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	Yunchao QI
	Guodong FANG
	Zhengong ZHOU
	Jun LIANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.171 OR https://www.cjmr.org/EN/Y2023/V37/I1/21

Fig.1 Schematic diagram of needle-punched preform

Table 1 Process and tensile strength of needle-punched composites

Fig.2 Size and shape of tensile specimen

Fig.3 Tensile test of needle-punched composites (a) and fracture of tensile specimen (b)

Fig.4 Stress-strain curves of needle-punched composites with different processes

Fig.5 SEM failure morphology of tensile specimen (a, b) and fracture of process 1 specimen (c) and fracture of process 5 specimen (d)

Fig.6 Two different needling areas (a) fiber deflection area and (b) fiber fracture area

Fig.7 Thickness direction equivalent length of deflected fiber

Fig.8 Model of needle punched composite

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%

Table 2 Material volume reduction coefficients of different needling processes

Fig.9 Model prediction strength of different $i$ values

Fig.10 Calculated values and experimental values of different process models (a) and Relative errors between calculated values and experimental values (b)

Fig.11 Fiber fracture of non-woven fabrics without damage (a) and with process damage (b)

Fig.12 Relationship between the number of broken fibers and volume reduction coefficient

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