Numerical and experimental investigation on the load‐bearing performance of plain‐woven composites hybrid bonded‐bolted joints

Shi, Jianwei; Yang, Xiaodong; Chen, Xishuai; Du, Kou; Li, Cheng; Yang, Yaxu

doi:10.1002/pc.27845

Polymer Composites

2023

DOI: 10.1002/pc.27845

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Numerical and experimental investigation on the load‐bearing performance of plain‐woven composites hybrid bonded‐bolted joints

Jianwei Shi,

Xiaodong Yang,

Xishuai Chen

et al.

Abstract: The jointing problem has become increasingly prominent with the growing applications of composites in industrial fields. Besides, the hybrid bonded‐bolted (HBB) joint has aroused extensive attention for its excellent mechanical performance. In this study, numerous tests and simulations were conducted to investigate the load‐bearing performance of the plain‐woven carbon fiber‐reinforced plastic (CFRP) laminates HBB joints under quasi‐static uniaxial tensile conditions. The influence of HBB morphological paramet… Show more

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2024

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Cited by 4 publications

References 49 publications

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The effect of hole‐making process on the performance of CFRP/Ti multi‐bolt joints and load distribution

Wang,

Gao,

Zou

et al. 2024

Polymer Composites

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The CFRP/Ti multi‐bolt joints are commonly used in important structural parts of aircraft. These structure often adopts an integrated drilling method to improve manufacturing efficiency and avoid assembly problems. However, significant differences in material properties between CFRP and titanium alloy can affect hole accuracy, leading to deviations in hole‐size that impact joint performance. In response to these challenges, this study conducted experiments on the hole‐making process for CFRP/Ti laminated multi‐bolt joints and analyzed hole‐size characteristics and precision. The research investigated the effect of hole‐making processes on the static tensile and fatigue performance of CFRP/Ti three‐bolt single‐lap joints specimens and revealed the influence of hole‐size characteristics on load distribution among bolts. Results indicated that titanium alloy chip formation during CFRP hole drilling induced a microcutting effect on CFRP hole walls, resulting in stepped holes. The use of low‐frequency vibration‐assisted drilling improved chip removal and enhanced hole‐making precision. The use of the LDR‐LDR‐CD combined hole‐making process can mitigate the secondary bending phenomenon of critical bolt in CFRP/Ti three‐bolt, single‐lap joints specimens, thereby reducing local stress concentrations. This process combination effectively distributes bolt loads evenly, resulting in a reduction of the bolt load ratio in critical holes by 6.2%, and increases ultimate load and fatigue life by 6.7% and 47.7%, respectively. Therefore, in the hole‐making process of CFRP/Ti multi‐bolt joints, it is crucial to ensure that the precision of critical holes is lower than that of auxiliary holes to decrease the bolt load ratio in critical holes and enhance structural joint performance.Highlights Novel method for uniformly distributing load based on controlling drilling precision. The formation process of CFRP/Ti hole diameter characteristics in different processes. The LDR‐LDR‐CD can optimize load distribution, improve ultimate load and fatigue life.

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The effect of hole‐making process on the performance of CFRP/Ti multi‐bolt joints and load distribution

Wang,

Gao,

Zou

et al. 2024

Polymer Composites

View full text Add to dashboard Cite

show abstract

Effects of structural parameters on the load distribution unevenness in CFRP hybrid bonded‐bolted joint

Shi,

Yang,

et al. 2024

Polymer Composites

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Carbon Fiber Reinforced Polymer (CFRP) Hybrid Bonded/Bolted (HBB) joint structures are distinguished for their superior jointing performance among current mechanical joint systems, making them a favored option for mechanical joints. These structures are characterized by many structural parameters, with the relationship between these parameters and jointing performance being notably complex. Additionally, the laminate's brittleness and the uneven distribution of bolt loads in multi‐bolt joint structures impair the overall jointing performance. To investigate the impact of structural parameters on the uneven load distribution within CFRP HBB joint structures and improve their jointing performance, a finite element analysis (FEA) model grounded in 3D Hashin failure criterion is developed. Validation of the model with experimental data confirmed the uneven load distribution among bolts in multi‐bolt joints. The study elucidated the influence of changes in structural parameters (overlap length, bolt‐hole spacing, and clearance fit) on the uneven load distribution and the connection strength of CFRP HBB joint structures. A negative correlation is found between the unevenness of load distribution and connection strength, offering insights for enhancing and researching connection strength in CFRP HBB joint structures.Highlights Developed a FEA model based on the 3D Hashin failure criterion for CFRP Bonded‐Bolted joints. Identified key factors affecting HBB joint load distribution and jointing performance. Evaluated the impact of overlap length, bolt‐hole spacing, and clearance fit on CFRP joints. Suggested design optimizations for enhancing the performance of HBB joints.

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Strength Optimisation of Hybrid Bolted/Bonded Composite Joints Based on Finite Element Analysis

Blier,

Monajati,

Mehrabian

et al. 2024

Materials

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A finite element analysis (FEA) was conducted to examine the behaviour of single-lap quasi-isotropic (QI) and cross-ply (CP) hybrid bolted/bonded (HBB) configurations subjected to tensile shear loading. Several critical design factors influencing the composite joint strength, failure conditions, and load-sharing mechanisms that would optimise the joining performance were assessed. The study of the stress concentration around the holes and along the adhesive layer highlights the fact that the HBB joints benefit from significantly lower stresses compared to only bolted joints, especially for CP configurations. The simulation results confirmed the redundancy of the middle bolt in a three-bolt HBB joint. The stiffness and plastic behaviour of the adhesive were found to be important factors that define the transition of the behaviour of the joint from a bolted type, where load sharing is predominant, to a bonded joint. The load-sharing potential, known as an indicator of the joint’s performance, is improved by reducing the overlap length, using a low-stiffness, high-plasticity adhesive, and using thicker laminates in the QI layup configuration. Enhancing both the ratio of the edge distance to the hole diameter and washer size proves advantageous in reducing stresses within the adhesive layer, thereby improving the joint strength.

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Numerical and experimental investigation on the load‐bearing performance of plain‐woven composites hybrid bonded‐bolted joints

Cited by 4 publications

References 49 publications

The effect of hole‐making process on the performance of CFRP/Ti multi‐bolt joints and load distribution

The effect of hole‐making process on the performance of CFRP/Ti multi‐bolt joints and load distribution

Effects of structural parameters on the load distribution unevenness in CFRP hybrid bonded‐bolted joint

Strength Optimisation of Hybrid Bolted/Bonded Composite Joints Based on Finite Element Analysis

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