Modeling on bearing behavior and damage evolution of single-lap bolted composite interference-fit joints

Hu, Junshan; Zhang, Kaifu; Xu, Yiwei; Cheng, Hui; Xu, Guanhua; Li, Hailin

doi:10.1016/j.compstruct.2019.01.044

Cited by 51 publications

(17 citation statements)

References 50 publications

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“…The first stress level is within the elastic range of matrix resin, while the latter two are beyond the matrix strength of 85.0 MPa, which is in accordance with the observed microstructure of the interface reported in Hu et al. 37…”

Section: Resultssupporting

confidence: 91%

Mechanism of bolt pretightening and preload relaxation in composite interference-fit joints under thermal effects

Zhang

Cheng

et al. 2020

Journal of Composite Materials

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The present research investigates the mechanism of bolt pretightening and preload relaxation in composite interference-fit joint structures under thermal effects. In view of the dissimilar material properties and the interfacial friction in such joints, the mechanical behavior of bolt and composites during assembly can be regarded as immediate preload response which is described by a linear elastic model, whereas the long-term behavior of composites during preload relaxation in service is considered as delayed response which is characterized by a viscoelastic model. The clamping forces on both sides of joints were captured to evaluate the preload balanced by the frictional behavior. The preload relaxation of joints with various interference-fit sizes and tightening torques under thermal effects were monitored for 240 hours to calibrate and validate the proposed model. The research revealed that the interference-fit size determined the level of frictional force which resulted in a difference between clamping forces at two sides of the fasteners. The preload first increases slowly with the growth of temperature, then decreases sharply when it approaches to glass transition temperature of matrix. The interference-fit joint behaves better in terms of maintaining the stability of preload than clearance-fit joints.

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Section: Resultssupporting

confidence: 91%

Mechanism of bolt pretightening and preload relaxation in composite interference-fit joints under thermal effects

Zhang

Cheng

et al. 2020

Journal of Composite Materials

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“…Though initial stress or damage might cause slight delamination during drilling and bolt installation as analyzed in literatures, 19,32 such riveting-induced damage is considered as neglectable here for the joints with clearance-fit and thick enough laminates.…”

Section: Modelingmentioning

confidence: 99%

“…To accurately view surface strain fields and overcome the divergence issues of laminates, novel experimental and modeling methods have been proposed, such as using digital image correlation (DIC) measurement by Zhai et al., 17 Haris et al., 18 Hu et al. 19 and explicit models by Liu et al., 20 Hu et al.. 21 Classical progressive damage models by Yang et al., 22 Chowdhury et al., 23 Ge et al. 24 were proved to be accurate for capturing the bolt load change or material damage propagation procedure for cracked laminates.…”

Section: Introductionmentioning

confidence: 99%

Damage mode and load distribution of countersunk bolted composite joints

Cheng

Huang³

et al. 2020

Journal of Composite Materials

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Tensile experiments were conducted with single-bolted and multi-bolted countersunk composite-metal joints. The finite element models with Hashin criteria and modified Camanho degradation law were developed to predict the bearing load and to simulate the failure behavior. The models were validated with the experimental results, including load-displacement curves and composite damage profiles. Based on the verified models, bolt load distributions of multi-bolted joints were calculated and analyzed before and after damage occurs. Results show that composite damages can change the bolt load distributions to a certain extent, which needs to be considered during the structure design. To adjust the bolt load distribution, the effects of joint variables, including bolt-hole clearance, bolt spacing, countersunk height ratio, and bolt stiffness combination, have been studied. It is found that the increase of the pin clearance around the largest bearing bolt would decrease its corresponding bearing load. The countersunk height ratio affects the bolt load distribution difference that a greater ratio leads to a less difference. The bolt spacing and bolt stiffness can also be used to reduce the bolt load distribution difference with elaborately designed combinations.

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“…Usually, an aircraft is composed of many components. The assembly between components inevitably adopts various connection technologies, including riveting [1][2][3][4][5][6], bolt connection [7][8][9][10][11][12], welding [13,14], bonding [15,16] and so on. Among them, riveting is still the main connection method, especially the connection of metal components [17], such as skin, bulkhead, longeron, etc.…”

Section: Introductionmentioning

confidence: 99%

Study on shear properties of riveted lap joints of aircraft fuselage with different hole diameters

Tian

Liao

et al. 2021

Preprint

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Riveting is the most important way to connect metal sheets, which is widely used in the connection of aircraft components. In this paper, the effect of different hole diameters on the shear properties of riveted lap joints were studied from the perspective of practical application. Considering the symmetry and the calculation time of the model, a 2D axisymmetric finite element method is established with the help of ABAQUS commercial finite element software, the validity of the finite element model is verified by experiment tests. Because the interference distribution has an important influence on the mechanical properties of riveted lap joints, the interference distribution and material flow characteristics in riveting process are analyzed in detail by using finite element method, and the shear characteristics of riveted lap joints in tensile process are explained. The variation of hole diameter with shear force under different squeeze force was obtained by shear test in order to explain the effect of hole diameter on the shear mechanical properties of riveted lap joint. In addition, the fracture mode and microstructure of the rivet shank were characterized by SEM and the formation process of brittleness and plastic fracture is discussed. Finally, the shear failure mechanism of riveted lap joint is analyzed in detail to provide guidance for engineering application. The test results show that all the specimens are both brittle and plastic mixed fracture modes of rivet shank, and the shear strength of the rivet increases with the increase of the hole diameter. Compared with increasing the squeeze force, increasing the hole diameter can effectively improve the shear strength of the riveted lap joint.

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Modeling on bearing behavior and damage evolution of single-lap bolted composite interference-fit joints

Cited by 51 publications

References 50 publications

Mechanism of bolt pretightening and preload relaxation in composite interference-fit joints under thermal effects

Mechanism of bolt pretightening and preload relaxation in composite interference-fit joints under thermal effects

Damage mode and load distribution of countersunk bolted composite joints

Study on shear properties of riveted lap joints of aircraft fuselage with different hole diameters

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