3钉带衬套复合材料/金属接头拉伸疲劳性能

doi:10.11868/j.issn.1001-4381.2021.000180

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摘要

带衬套沉头螺栓连接已经在复合材料连接结构中得到了一定应用，需要对其疲劳性能进行研究。本工作在单搭接3钉带衬套碳纤维复合材料/钛合金沉头螺栓连接接头实验研究基础上，建立复合材料及金属结构的疲劳分析模型，对结构的疲劳性能进行有限元分析，并与无衬套接头模型进行对比，研究衬套对接头疲劳性能的影响。结果表明，使用衬套比仅采用螺杆过盈装配能够更加有效地提升接头的疲劳寿命，其中层合板寿命提高了约3.6倍，钛合金板寿命提高了约2.7倍，螺栓寿命提升了约14倍，并且仅出现钛合金板破坏，紧固件不破坏。结合实验结果分析发现，由于复合材料和金属材料自身疲劳性能的差异，其机械连接结构的疲劳破坏模式会因载荷水平的不同而发生变化；当载荷水平较低时，金属结构更容易发生破坏。

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	安子乾
	舒茂盛
	程羽佳
	郭鑫
	程小全

关键词 ：复合材料/金属接头, 螺栓连接, 含衬套沉头螺栓, 拉伸疲劳, 渐进损伤模型

Abstract：

Countersunk bolt joints with sleeves have been used in composite connection structures, and their fatigue performances need to be studied. Based on the experimental investigation conducted on the single lap CFRP/titanium alloy bolted joint with 3-countersunk head bolt and sleeves, the fatigue models of composite laminates and metal structures were established to analyze the fatigue performances of the structure, and finite element analysis on joints without sleeves was also carried out to study the influences of the sleeves on fatigue performance of the joint. The results show that the use of sleeves can more effectively improve the fatigue performance of the joint compared to that only using interference fit. The fatigue life of laminate is increased by about 3.6 times, the titanium alloy plate increased by about 2.7 times, and the bolts are increased by about 14 times. Only the titanium alloy plate of the joint fails, but not the fastener. Combined with analysis on the experimental results, it is found that the fatigue failure mode of bolted joints structure will change with different load levels due to the different fatigue properties between composite materials and metal materials; and the metal structure is prone to be damaged under a certain load level.

Key words： composite/metal joint bolted joint countersunk bolt with sleeve tensile fatigue perfor-mance progressive damage model

收稿日期: 2021-03-01 出版日期: 2021-12-20

中图分类号:

V214.8

通讯作者: 程小全 E-mail: xiaoquan_cheng@buaa.edu.cn

作者简介: 程小全(1966-)，男，教授，博士，博士生导师,主要研究方向为复合材料结构损伤容限分析与设计技术研究,联系地址：北京市海淀区学院路37号北京航空航天大学飞机系(100191)，E-mail:xiaoquan_cheng@buaa.edu.cn

引用本文:

安子乾, 舒茂盛, 程羽佳, 郭鑫, 程小全. 3钉带衬套复合材料/金属接头拉伸疲劳性能[J]. 材料工程, 2021, 49(12): 164-174.
Zi-qian AN, Mao-sheng SHU, Yu-jia CHENG, Xin GUO, Xiao-quan CHENG. Tensile fatigue properties of composite/metal bolted joints with 3-pin and sleeves. Journal of Materials Engineering, 2021, 49(12): 164-174.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2021.000180 或 http://jme.biam.ac.cn/CN/Y2021/V49/I12/164

Fig.1 3钉连接实验件构型
(a)带衬套试件；(b)无衬套试件

Fig.2 实验中试件的夹持与加载状态
(a)静力实验; (b)疲劳实验

Table 1 试件类型与数量

Table 2 失效单元材料性能突降准则

Fig.3 有限元模型

Fig.4 复合材料层合板疲劳性能分析流程图

Table 3 T700/双马树脂单向板材料属性^[14]

Table 4 T800/5245单向板剩余强度衰减规律参数及疲劳寿命参数^[9]

Fig.5 静力实验载荷-位移曲线及两类接头计算结果

Fig.6 静力拉伸实验破坏模式及计算结果对比

Table 5 条件挤压载荷实验值与计算结果对比

Table 6 实验结果与计算结果对比

Fig.7 疲劳破坏模式对比
(a)带衬套试件；(b)无衬套试件

Fig.8 夹头最大位移增量-疲劳循环数曲线
(a)带衬套试件；(b)无衬套试件

Fig.9 100000次循环载荷后层合板中不同角度铺层的纤维破坏扩展情况

Fig.10 100000次循环载荷后层合板中不同角度铺层的基体破坏扩展情况

Fig.11 孔径永久变形量对比

Fig.12 钛合金板孔边应变场对比

Table 7 金属结构对数寿命预测结果

Fig.13 R=0.1时T700/MTM46复合材料层合板及TC4钛合金S-N曲线对比

Fig.14 带衬套接头在100000次循环后孔边破坏情况
(a)基体破坏；(b)纤维破坏

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