Effect of Stacking Sequences on Bonding Performance of CFRP-Al Single-lap Joint

doi:10.11901/1005.3093.2021.145

Chinese Journal of Materials Research

2022, Vol. 36

Issue (9): 715-720 DOI: 10.11901/1005.3093.2021.145

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Effect of Stacking Sequences on Bonding Performance of CFRP-Al Single-lap Joint

ZOU Tianchun, JU Yuezhang(

), LI Longhui, FU Ji

College of Airworthiness, Civil Aviation University of China, Tianjin 300300, China

Cite this article:

ZOU Tianchun, JU Yuezhang, LI Longhui, FU Ji. Effect of Stacking Sequences on Bonding Performance of CFRP-Al Single-lap Joint. Chinese Journal of Materials Research, 2022, 36(9): 715-720.

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Abstract

Laminated plates of carbon fiber reinforce plastic (CFRP) with different stacking sequences, namely [45/-45]_4s, [0/90]_4s and [0/45/-45/90]_2s were produced via autoclave.They were glue-jointed with Al-plate to prepare single-lap joint samples at room temperature. The single-lap joint performance of the prepared samples was assessed by means of universal testing machine, digital image correlation (DIC) and scanning electron microscope (SEM) in terms of load-displacement curves, strain field distribution and fracture appearance of adhesive joints. On this basis, the mechanical properties of CFRP-Al single-lap joints were analyzed, the influence of different stacking sequences on the bonding performance of CFRP-Al single-lap joints, while the failure mechanism of adhesive joints were revealed. The results show that during the tensile process, the sample with [45/-45]_4s presents a plastic deformation stage and its tensile displacement is the largest; while the tensile displacements of samples with [0/45/-45/90]_2s and [0/90]_4s are less, and they present brittle fracture. In general, the ultimate load of the sample and the number of fiber bundles fracture increase for samples in the following order, namely samples with [45/-45]_4s, [0/45/-45/90]_2s and [0/90]_4s, but their interlaminar shear force, the strain field concentration degree and the delamination damage degree gradually decrease.

Key words: composite stacking sequences bonding of dissimilar materials strain field distribution fracture appearance

Received: 21 February 2021

ZTFLH:

TB33

About author: JU Yuezhang, Tel: 13161231877, E-mail: juyuezhang1@163.com

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	Tianchun ZOU
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https://www.cjmr.org/EN/10.11901/1005.3093.2021.145 OR https://www.cjmr.org/EN/Y2022/V36/I9/715

Fig.1 Single-lap joint of CFRP-Al

Fig.2 Schematic diagram of adhesive layer thickness control

Fig.3 Production process of CFRP Laminates

Property	$E 11$ /MPa	$E 22$ /MPa	$E 33$ /MPa	$G 12$ /MPa	$G 13$ /MPa	$G 23$ /MPa	$ν$	Density, ρ/kg·m^-3
Value	121000	8600	8600	3450	3450	2800	0.301	1467

Table 1 Material properties of CFRP laminates

Properties

Young′s modulus,

E/MPa

Poisson′s ratio,

ν

Density, ρ

/kg·m^-3

Value

71700

0.32

3000

Table 2 Properties of Al7075

Fig.4 Testing equipment

Fig.5 Load-displacement curve of different stacking sequences

Fig.6 Strain field in front x direction of single-lap joint with different stacking sequences (a) [45/-45]_4s, (b) [0/45/-45/90]_2s, (c) [0/90]_4s

Fig.7 Typical failure mode of single lap joints with different stacking sequences (a) [45/-45]_4s, (b) [0/45/-45/90]_2s, (c) [0/90]_4s

Fig.8 SEM images of angle between fiber layers before and after tensile tests of [45/-45]_4s(a) before tensile tests_, (b) after tensile tests

Fig.9 SEM images of failure modes of single lap joints with different stacking sequences (a) [45/-45]_4s, (b) [0/45/-45/90]_2s, (c) [0/90]_4s

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