Journal of South China University of Technology(Natural Science) >

2022 , Vol. 50 >Issue 11: 95 - 106

DOI: https://doi.org/10.12141/j.issn.1000-565X.220105

Architecture & Civil Engineering

Experimental Study on Fatigue Behavior of Adhesive & Bolted Hybrid FRP Joints

Expand
  • 1.School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    2.Shanghai Urban Construction Design and Research Institute(Group)Co. , Ltd. , Shanghai 200125, China
王进潇（1993-），男，博士生，主要从事复合材料桥梁研究.Email:youz-wjx@sjtu.edu.cn.

Received date: 2022-03-03

  Online published: 2022-07-26

Supported by

the National Natural Science Foundation of China(51978400)

Fold

Abstract

FRP adhesive & bolted hybrid joint has the combined advantages of adhesive joints and bolted joints, which behave enhanced static performance, but its fatigue failure mechanism still needs to be studied. In order to study the fatigue performance of hybrid FRP joints under various working conditions, this study designed and manufactured single-lap hybrid FRP joints specimens. Firstly, the static load tests under axial tension loads and four side shear loads were carried out, and the corresponding failure modes and ultimate bearing capacity were obtained. Then, high cycle fatigue tests under two working conditions were carried out, and the damage process of the adhesive layer was measured by acoustic emission (AE) technology. The fatigue failure mode, characteristic fatigue life and stiffness degradation of the specimen were obtained, and the fatigue life prediction method was proposed. The results indicate that the anti- -fatigue performance of hybrid FRP joints is mainly controlled by bolted-connection, and its fatigue failure process can be divided into four stages: adhesive layer cumulative damage, adhesive layer failure, FRP cumulative damage, and FRP failure. Among them, the AE characteristic parameters of adhesive layer failure stage and FRP failure stage change significantly, and this can be used as the basis for identifying the failure occurrence. When the number of bolts is small, two working condition show the similar failure mode of the nut squeezing into the FRP plate. When the number of bolts is large, for tensile specimens, the tensile-shear failure mainly occurs at the hole of the FRP plate; for shear specimens, the failure mode is overall shear failure of FRP plate. The increase of the number of bolts can significantly improve the characteristic fatigue life of tensile specimens, and effectively inhibit the stiffness degradation during fatigue loads, but the improvement of fatigue performance of shear specimens is not obvious with the increasing number of bolts. The S-N curve of two working conditions obtained based on the test data can provide a reference for the fatigue life calculation of hybrid FRP joints, and help the application of such joints in bridges and other structures that mainly bear repeated loads.

Key words： FRP joint; adhesive &; bolted hybrid connection; fatigue behavior; axial tensile test; fatigue failure mode; characteristic fatigue life; acoustic emission

Cite this article

WANG Jinxiao, LI Sida, CHENG Bin, et al . Experimental Study on Fatigue Behavior of Adhesive & Bolted Hybrid FRP Joints[J]. Journal of South China University of Technology(Natural Science), 2022 , 50(11) : 95 -106 . DOI: 10.12141/j.issn.1000-565X.220105

References

1 韩小雷， ZOU X W，季静 ．纤维增强塑料（FRP）在混凝土结构中的应用——FRP材料性能与发展 ［J］．华南理工大学学报（自然科学版），2002，30（2）：69-72.
1 HAN Xiaolei， ZOU X W， JI Jing ．Fibre reinforced plastics（FRP）used in concrete structures：properties and development ［J］．Journal of South China University of Technology（Natural Science Edition），2002，30（2）：69-72.
2 ABDELKERIM D， WANG X， IBRAHIM H A，et al ．Static and fatigue behavior of pultruded FRP multi-bolted joints with basalt FRP and hybrid steel-FRP bolts ［J］．Composite Structures，2019，220（7）：324-337.
3 初明越，阳玉球，赵德方，等 ．接头尺寸对玻璃纤维/热塑性树脂复合材料机械连接性能的影响 ［J］．复合材料学报，2019，36（6）：1153-1163.
3 CHU Mingyue，YANG Yuqiu，ZHAO Defang，et al，Effect of joint dimension on the mechanically fastened joint properties of glass fiber/ thermoplastic resin composites ［J］．Acta Material Composite Sinica，2019，36（6）：1153-1163.
4 杨显昆，郑锡涛，成李南，等 ．复合材料层合板单钉双剪连接挤压强度的一种工程估算方法 ［J］．复合材料学报，2012，29（6）：225-229.
4 YANG Xiankun，ZHENG Xitao，CHENG Linan，et al，An engineering approach to predict the bearing strength of single-bolted double-lapped joint in composite laminate ［J］．Acta Material Composite Sinica，2012，29（6）：225-229.
5 李想，谢宗蕻 ．复合材料多钉连接钉载分配均匀化的泰勒展开方法 ［J］．哈尔滨工业大学学报，2019，51（11）：108-115.
5 LI Xiang， XIE Zonghong ．A Taylor Expansion algorithm for the load distribution homogenization ofmulti-bolt composite joints ［J］．Journal of Harbin Institute of Technology，2019，51（11）：108-115.
6 KHASHABA U A， SALLAM H， AL-SHORBAGY A E，et al ．Effect of washer size and tightening torque on the performance of bolted joints in composite structures ［J］．Composite Structures，2006，73（3）：310-317.
7 SEN F， PAKDIL M， SAYMAN O，et al ．Experimental failure analysis of mechanically fastened joints with clearance in composite laminates under preload ［J］．Materials & Design，2008，29（6）：1159-1169.
8 黄文俊，程小全，武鹏飞，等 ．复合材料混合连接结构拉伸性能与影响因素分析［J］．北京航空航天大学学报，2013，39（10）：1408-1413.
8 HUANG Wenjun，CHENG Xiaoquan，WU Pengfei，et al，Analysis on tensile properties and influence factors of composite hybrid joints ［J］．Journal of Beijing University of Aeronautics and Astronautics，2013，39（10）：1408-1413.
9 LIU L， WANG X， WU Z，et al ．Tension-tension fatigue behavior of ductile adhesively-bonded FRP joints ［J］．Composite Structures，2021，268：113925.
10 LIU L， WANG X， WU Z，et al ．Resistance and ductility of FRP composite hybrid joints ［J］．Composite Structures，2021，255：113001.
11 李曙光 ．FRP构件的连接及其设计方法研究 ［D］.西安：西安建筑科技大学，2012.
12 ZHANG H， ZHANG L， LIU Z，et al ．Numerical analysis of hybrid（bonded/bolted）FRP composite joints：A review ［J］．Composite Structures，2021，262（2）：113606.
13 KIM K S， YOO J S， YI Y M，et al ．Failure mode and strength of uni-directional composite single lap bonded joints with different bonding methods ［J］．Composite Structures，2006，72（4）：477-485.
14 SARKANI S， MICHAELOV G， KIHL D P，et al ．Stochastic fatigue damage accumulation of FRP laminates and joints ［J］．Journal of Structural Engineering，1999，125（12）：1423-1431.
15 KELLY G ．Quasi-static strength and fatigue life of hybrid（bonded/bolted）composite single-lap joints ［J］．Composite Structures，2006，72（1）：119-129.
16 HOANG-NGOC C， PAROISSIEN E ．Simulation of single-lap bonded and hybrid（bolted/bonded）joints with flexible adhesive ［J］．International Journal of Adhesion and Adhesives，2010，30（3）：117-129.
17 CHOWDHURY N M， CHIU W K， WANG J，et al ．Experimental and finite element studies of bolted，bonded and hybrid step lap joints of thick carbon fibre/epoxy panels used in aircraft structures ［J］．Composites Part B：Engineering，2016，100：68-77.
18 CHOWDHURY N M， WANG J， CHIU W K，et al ．Static and fatigue testing bolted，bonded and hybrid step lap joints of thick carbon fibre/epoxy laminates used on aircraft structures ［J］．Composite Structures，2016，142：96-106.
19 孟超，彭卫东，宁小波，等 ．玻璃纤维复合材料损伤过程的声发射特性研究 ［J］．复合材料科学与工程，2016（12）：23-27.
19 MENG Chao，PENG Weidong，NING Xiaobo，et al，Study on acoustic em`ission characteristics of damage process of glass fiber composites ［J］．Composite Science and Engineering，2016（12）：23-27.
20 李昕，康正亮，胥凯晖，等 ．GFRP不同损伤情况下声发射检测信号特征研究 ［J］．南昌航空大学学报（自然科学版），2016，30（4）：75-81.
20 LI Xin，KANG Zhengliang，XU Kaihui，et al，Characteristics research for acoustic emission testingsignal of different damage of GFRP ［J］．Journal of Nanchang Hangkong University（Natural Sciences），2016，30（4）：75-81.
Options
Outlines

/

〈 〉