航空学报 > 2024, Vol. 45 Issue (S1): 730591-730591   doi: 10.7527/S1000-6893.2024.30591

角片厚度对螺栓对接结构力学性能的影响

郭轩(), 刘彦杰, 刘洪权, 张引利   

  1. 航空工业第一飞机设计研究院,西安 710089
  • 收稿日期:2024-04-22 修回日期:2024-05-06 接受日期:2024-05-21 出版日期:2024-05-31 发布日期:2024-05-29
  • 通讯作者: 郭轩 E-mail:452017498@qq.com
  • 基金资助:
    国家级项目

Influence of thickness of curved laminate on mechanical behavior of butt-bolted joints

Xuan GUO(), Yanjie LIU, Hongquan LIU, Yinli ZHANG   

  1. AVIC the First Aircraft Institute,Xi’an 710089,China
  • Received:2024-04-22 Revised:2024-05-06 Accepted:2024-05-21 Online:2024-05-31 Published:2024-05-29
  • Contact: Xuan GUO E-mail:452017498@qq.com
  • Supported by:
    National Level Project

摘要:

从试验及有限元2个方面研究角片厚度对钛-铝螺栓对接结构力学性能的影响规律。设计A、B两种构型共8组试验件,构型A试验件旨在获得纯拉伸状态下结构破坏载荷及破坏模式,构型B试验件旨在获得不同角片厚度下结构破坏载荷及破坏模式。基于试验结果建立全尺寸三维有限元模型对以上所述试验组的力学性能进行研究,通过Johnson-Cook定义材料属性及损伤准则来模拟其损伤起始及演化,数值仿真得到的连接刚度、破坏模式及破坏载荷均与试验结果高度吻合,且直观地展现了试验件的损伤起始与扩展过程,进一步对螺栓对接结构的破坏机理进行了诠释。试验与仿真结果表明,不同角片厚度匹配关系下,螺栓对接结构刚度、破坏载荷及破坏模式呈现规律性;典型的破坏模式有4种:螺栓横截面断裂(I型)、螺栓头翘起破坏(II型)、螺栓头环切破坏(III型)及角片拉豁破坏(IV型)。本文获得了角片厚度对钛-铝螺栓对接结构力学性能的影响规律,绘制不同角片厚度匹配关系下的破坏模式“毯式图”,为钛-铝螺栓对接结构的设计提供了可靠的工程数据及数值模拟方法。

关键词: 钛-铝螺栓对接, 角片厚度, 破坏载荷, 破坏模式, 有限元模型(FEM), Johnson-Cook

Abstract:

The Influence of thickness of on mechanical behavior of butt-bolted joints is investigated via experiments and finite element analysis. A test is carried out on 8 sets of specimens, which are divided into 2 groups( A and B). The failure load and mode of bolt under tensile load is acquired via Group A specimens, and the influence of thickness of curved laminate on failure load and mode is obtained by Group B specimens. Based on the experimental results, 3D Finite Element Models (FEMs) are proposed to investigate the mechanical behavior of the specimens’ structure. Using Johnson-Cook, the material properties and damage criterion are defined to simulate the initiation and evolution of the bolt damage. The failure mode, the ultimate load and the calculated stiffness obtained with FEM are in good agreement with the test results. Furthermore, the damage initiation and evolution process are visualized with FEM, and the failure mechanism of butt-bolted joints is explained. According to the results of test and simulation, the stiffness, failure load and mode of the bolt is closely relevant to the thickness of curved laminate. There are four kinds of typical failure modes: bolt cross-section fracture (Type I), bolt head curling failure (Type Ⅱ), bolt head girding failure (Type Ⅲ), and curved laminate failure (Type Ⅳ). The influence rule of thickness of curved laminate on the mechanical properties of butt-bolted joints is obtained, and the “carpet map” about the failure mode versus the thickness of curved laminate, providing reliable engineering data and an efficient FEM method for the design of Ti-Al butt-bolted joints.

Key words: Ti-Al butt-bolted joints, thickness of curved laminate, collapse load, failure mode, finite element model (FEM), Johnson-Cook

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