铺层方式对<strong>CFRP-Al</strong>单搭接接头胶接性能的影响

doi:10.11901/1005.3093.2021.145

材料研究学报

2022, Vol. 36

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

研究论文

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铺层方式对CFRP-Al单搭接接头胶接性能的影响

邹田春, 巨乐章(

), 李龙辉, 符记

中国民航大学适航学院天津 300300

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

引用本文:

邹田春, 巨乐章, 李龙辉, 符记. 铺层方式对CFRP-Al单搭接接头胶接性能的影响[J]. 材料研究学报, 2022, 36(9): 715-720.
Tianchun ZOU, Yuezhang JU, Longhui LI, Ji FU. Effect of Stacking Sequences on Bonding Performance of CFRP-Al Single-lap Joint[J]. Chinese Journal of Materials Research, 2022, 36(9): 715-720.

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摘要:

使用热压罐制备[45/-45]_4s、[0/90]_4s和[0/45/-45/90]_2s三种铺层方式的CFRP层合板,然后在室温下与Al胶接制备出单搭接试样。使用电子万能试验机、数字图像相关法(DIC)和扫描电子显微镜(SEM)等手段测量胶接接头的拉伸载荷-位移曲线和应变分布并观察断口形貌。基于试验数据分析不同铺层方式下CFRP-Al单搭接接头的拉伸性能,研究了铺层方式对CFRP-Al单搭接接头胶接性能的影响和铺层方式胶接接头的破坏机制。结果表明,在拉伸过程中[45/-45]_4s试样出现塑性变形阶段其拉伸位移最大,而[0/45/-45/90]_2s和[0/90]_4s试样的拉伸位移较小且发生了脆性断裂。铺层方式从[45/-45]_4s到[0/45/-45/90]_2s再到[0/90]_4s,试样的极限载荷和纤维束断裂数量增加、层间剪切力减小、应变集中程度和分层破坏程度降低。

关键词 ：复合材料, 铺层方式, 异质材料胶接, 应变分布, 断口形貌

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

收稿日期: 2021-02-21

ZTFLH:

TB33

作者简介: 邹田春,男,1976年生,副教授

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图1 CFRP-Al单搭接接头

图2 胶厚控制方法的示意图

图3 CFRP层合板的制作工艺

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

表1 CFRP层合板材料性能

Properties

Young′s modulus,

E/MPa

Poisson′s ratio,

ν

Density, ρ

/kg·m^-3

Value

71700

0.32

3000

表2 Al7075材料性能

图4 实验用设备

图5 不同铺层方式接头的载荷-位移曲线

图6 不同铺层方式单搭接接头的正面x方向应变场

图7 不同铺层方式单搭接接头的典型破坏模式

图8 拉伸实验前后[45/-45]4s铺层下纤维之间夹角的SEM照片

图9 不同铺层方式下单搭接接头破坏模式的SEM照片

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