CFRP/DC04钢胶接接头弯曲特性数值分析

复合材料科学与工程 ›› 2019, Vol. 0 ›› Issue (11): 37-44.

CFRP/DC04钢胶接接头弯曲特性数值分析

董柏岩¹, 马其华^1,2*

1.上海工程技术大学机械与汽车工程学院,上海 201620;
2.东华大学机械工程学院,上海 201620

收稿日期:2019-02-20 出版日期:2019-11-28 发布日期:2019-11-28
通讯作者: 马其华(1980-),男,博士研究生,副教授,主要从事汽车轻量化及碳纤维复合材料应用方面的研究,mqh0386@163.com。
作者简介:董柏岩(1993-),男,硕士研究生,主要从事复合材料汽车轻量化方面的研究。
基金资助:
纤维材料改性国家重点实验室开放课题(KF1826);中央高校基本科研业务费专项资金学科交叉重点计划项目(18D110320);中央高校基本科研业务费专项资金(2232018A3-02);上海工程技术大学研究生科研创新项目资助(E3-0903-18-01150)

NUMERICAL ANALYSIS OF BENDING CHARACTERISTICS OF CFRP/DC04 STEEL BONDING JOINTS

DONG Bo-yan¹, MA Qi-hua^1,2*

1.School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;
2.College of Mechanical Engineering, Donghua University, Shanghai 201620, China

Received:2019-02-20 Online:2019-11-28 Published:2019-11-28

摘要/Abstract

摘要： 根据CFRP/DC04钢胶接接头的准静态三点弯曲试验,建立了胶接样件的有限元模型,采用ABAQUS/Explicit计算得到的模拟结果与试验结果具有良好的一致性,证明模型较好地重现了胶接接头在受载时的力学响应。基于模拟结果,对接头胶层的应力分布规律及损伤失效机理进行了分析,结果表明:在样件受横向弯曲载荷作用下,胶层各应力分布差异明显,法向应力σ集中分布在胶层两端;剪切应力τ₁₃沿胶层长度呈中心对称分布;剪切应力τ₂₃则集中于胶层的四个端角。由于粘接板的刚度和相对位置不同,前端胶层因承载较大的法向应力而最先发生了剥离破坏,并逐渐向尾端扩展。基于此,分析了粘接板件相对位置对胶接接头抗弯性能的影响,发现与CFRP置于顶部相比,将CFRP板置于底部可得到更好的接头韧性和更高的抗弯强度。

关键词: 数值模拟, CFRP/DC04胶接, 应力, 损伤失效, 相对位置

Abstract: The finite element model of the bonded specimens was established based on the quasi-static three-point bending test of CFRP/DC04 steel bonded joints and the simulation results calculated by ABAQUS/Explicit have good consistency with the test results, which proves that the model reproduces the mechanical response of the bonded joint under load. Based on the simulation results, the stress distribution law and damage failure mechanism of the adhesive layer are analyzed. The results show that the stress distribution of the adhesive layer is obviously different under the bending load. The normal stress σ is mainly concentrated at both ends; the shear stress τ₁₃ is symmetrically distributed along the length of the adhesive; the shear stress τ₂₃ is distributed at the four corners of the adhesive. Due to the different stiffness and relative position of the bonding plates, the adhesive at one end first is peeled off due to large normal stress, and gradually expands to the other end. Based on this, the influence of the relative position of the bonded plates on the bending resistance of the bonded joints was analyzed. It was found that the CFRP plate at bottom has a better joint tenacity and higher bending strength than the plate at the top.

Key words: numerical simulation, CFRP/DC04 bonding, stress, damage failure, relative position

中图分类号:

TB332

董柏岩, 马其华. CFRP/DC04钢胶接接头弯曲特性数值分析[J]. 复合材料科学与工程, 2019, 0(11): 37-44.

DONG Bo-yan, MA Qi-hua. NUMERICAL ANALYSIS OF BENDING CHARACTERISTICS OF CFRP/DC04 STEEL BONDING JOINTS[J]. Composites Science and Engineering, 2019, 0(11): 37-44.

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