考虑固化残余应力影响的Z-pin增韧复材压缩性能预测方法

doi:10.7527/S1000-6893.2024.29966

Abstract

Abstract:

The Z-pinning technology can effectively improve the interlaminar properties of composite materials， yet the implantation of Z-pins causes fiber distortion， resin-rich zones， and reduced in-plane properties. This paper proposes a numerical method to predict the in-plane compressive properties of Z-pinned composites， with curing effects into consideration. A representative unit cell model is established by analyzing the fine morphology of the Z-pinned structure. Considering the time-dependent properties of the cure process， we develop a coupled thermo-chemo-mechanical multi-field model for Z-pinned structures. The residual stress field obtained from the previous calculation is introduced as a predefined field in the calculation of in-plane compressive performance， and the simulated results are in good agreement with the experimental results. It is found that a large amount of residual stress accumulates around the Z-pin during the cure. Therefore， under compressive loads， weaker material properties around the Z-pin will first develop crack defects， gradually extending to the resin-rich regions. The presence of fiber orientation， resin-rich regions， and cure-induced residual stresses significantly reduce the in-plane compressive performance of Z-pinned composites.

Key words: Z-pin, composites, fiber distortion, cure process, residual stress, finite element analysis, compressive properties

CLC Number:

V414.8

Shengnan ZHANG, Yingjie XU, Weihong ZHANG. Numerical study on curing residual stresses in compression of Z-pinned composites[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(20): 429966.

Figures/Tables 21

Fig.1

Fig.2

Table 1

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Table 2

Table 3

Table 4

Table 5

Damage parameters of interface［11， 28］

法向强度

$σ n 0$ /MPa

切向强度

$σ s 0$ /MPa

I型断裂韧性

G_Ic/（N·mm^-1）

Ⅱ型断裂韧性

G_Ⅱc/（N·mm^-1）

刚度K_nn/MPa

刚度K_ss/MPa

损伤因子ξ

0.1

100 000

Table 5

Fig.9

Fig.10

Fig.11

Table 6

Fig.12

Table 7

Fig.13

Fig.14

References 30

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性能参数	纤维	树脂	Z-pin
纵向模量/MPa	230 000	3.35	100 000
横向模量/MPa	13 800	3 350	30 000
剪切模量/MPa	8 970	1 240	4 600
泊松比	0.2	0.35	0.35
热膨胀系数/℃^-1	-0.7×10^-6	81.4×10^-6	0
热膨胀系数/℃^-1	12×10^-6	34.6×10^-6	0
化学收缩系数	0	-0.02	0

参数	实验1	实验2	实验3	平均值	仿真	误差/%
压缩强度/MPa	963	885	998	949	945	0.42
压缩模量/MPa	1 355	1 463	1 193	1 337	1 344	0.52

参数	实验1	实验2	实验3	平均值	仿真	误差/%
压缩强度/MPa	500	395	535	476	522	9.52
压缩模量/GPa	132	104	140	125	134	6.93

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Numerical study on curing residual stresses in compression of Z-pinned composites

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