胶层厚度对胶粘剂I型断裂韧性影响试验和仿真研究

doi:10.3901/JME.2018.10.043

机械工程学报 ›› 2018, Vol. 54 ›› Issue (10): 43-52.doi: 10.3901/JME.2018.10.043

胶层厚度对胶粘剂I型断裂韧性影响试验和仿真研究

韩啸¹, 金勇¹, 杨鹏², 李小阳², 侯文彬³

1. 大连理工大学工程力学系大连 116024;
2. 中国工程物理研究院电子工程研究所绵阳 621900;
3. 大连理工大学汽车工程学院大连 116024

收稿日期:2017-09-05 修回日期:2017-12-19 出版日期:2018-05-20 发布日期:2018-05-20
通讯作者: 韩啸(通信作者),男,1987年出生,博士,讲师,硕士研究生导师。主要研究方向为轻量化连接结构及其多场耦合老化行为建模和预测。E-mail:hanxiao@dlut.edu.cn
作者简介:金勇,男,1992年出生,硕士研究生。主要研究方向为胶粘剂力学性能及其断裂特性的湿热老化行为;杨鹏,男,1987年出生,博士,助理研究员。主要研究方向为环氧树脂结构与性能;李小阳,男,1990年出生,博士,助理研究员。主要研究方向为环氧树脂抗冲击改性。
基金资助:
国家自然科学基金（51605072）、中国博士后科学基金（2015M581327）、辽宁省教育厅科学研究（L2015109）和中央高校基本科研业务费专项资金（DUT17RC （4）58）资助项目。

Experimental and Simulation Study on the Effect of Adhesive Thickness on Mode I Fracture Toughness

HAN Xiao¹, JIN Yong¹, YANG Peng², LI Xiaoyang², HOU Wenbin³

1. Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024;
2. Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900;
3. School of Automotive Engineering, Dalian University of Technology, Dalian 116024

Received:2017-09-05 Revised:2017-12-19 Online:2018-05-20 Published:2018-05-20

摘要/Abstract

摘要： 同传统结构连接方式相比，胶接技术具有诸多优势，在各个工业领域得到了广泛应用。胶层在胶接结构载荷传递过程中起着关键作用，对其内部裂纹扩展机理的研究就显得尤为重要。采用胶接双悬臂梁试验和内聚力模型数值仿真相结合的方法，研究胶层厚度对胶粘剂I型断裂韧性的影响规律。为了克服双悬臂梁试验中裂纹长度精确监测的困难，开发了基于柔度的梁方法对试验数据进行分析，进而得到I型断裂韧性数值。引入双线性内聚力模型对胶层裂纹扩展过程进行模拟，通过分析试验与数值模拟得到的载荷-位移曲线、R曲线和I型断裂韧性数据，验证了有限元模型的准确性。结果表明，胶层厚度对胶粘剂正应力工况下断裂特性有着显著影响，在所研究胶层厚度范围内，随着厚度增加其I型断裂韧性先增大后减小，失效模式则由内聚失效转变为混合失效。

关键词: 断裂力学, 断裂韧性, 结构胶粘剂, 内聚力模型, 有限元仿真

Abstract: Structural adhesive bonding has many advantages over traditional connection methods and has gained wide application in various industrial fields. As adhesive layer plays a key role in the load transfer of bonded structure, it becomes essential to understand the mechanism of crack propagation in the adhesive layer. A combined experimental-numerical method is proposed using double cantilever beam and cohesive zone model; to study the effect of adhesive thickness on Mode I fracture toughness. In order to overcome the difficulty in the accurate measurement of crack length, a compliance-based beam method is developed to obtain the Mode I fracture toughness data. A bilinear cohesive zone model is introduced to simulate the crack propagation behaviour in the adhesive layer. The load-displacement curve, R curve and Mode I fracture toughness data obtained from both experiment and simulation are analysed to validate the FE model. It is observed that adhesive thickness has significant influence on the fracture behaviour of adhesive under Mode I loading condition. The Mode I fracture toughness shows a concave trend with the increase of adhesive thickness, while the failure mode of the fracture surface also changes from cohesive failure to mixed failure.

Key words: cohesive zone model, finite element simulation, fracture mechanics, fracture toughness, structural adhesive

中图分类号:

O346
U466

韩啸, 金勇, 杨鹏, 李小阳, 侯文彬. 胶层厚度对胶粘剂I型断裂韧性影响试验和仿真研究[J]. 机械工程学报, 2018, 54(10): 43-52.

HAN Xiao, JIN Yong, YANG Peng, LI Xiaoyang, HOU Wenbin. Experimental and Simulation Study on the Effect of Adhesive Thickness on Mode I Fracture Toughness[J]. Journal of Mechanical Engineering, 2018, 54(10): 43-52.

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胶层厚度对胶粘剂I型断裂韧性影响试验和仿真研究

Experimental and Simulation Study on the Effect of Adhesive Thickness on Mode I Fracture Toughness

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