Design variables influencing the fatigue of Al 2024-T3 in riveted aircraft lap joints: Squeeze force and initial fit tolerance

Zeng, Chao; Xue, Jiu Tian; Liu, Xiang Yao; Tian, Wei

doi:10.1016/j.ijfatigue.2020.105751

Cited by 21 publications

(9 citation statements)

References 34 publications

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“…The mutation points of radial displacement in paths 2, 3, and 4 are earlier compared with path 1. Therefore, it is more appropriate to describe the radial ow with the increase of the radial displacement of the material inside the rivet shank, which is consistent with the previous research conclusion [36]. Careful observation shows that the radial deformation of rivet shank increases with the increase of hole diameter, especially when the hole diameter is 5.00 mm and 5.10 mm (see Fig.…”

Section: In Uence Of Hole Diameter On Interference Distribution and Msupporting

confidence: 87%

“…Zeng et al [35] established an analytical model of interface pressure affected by initial t tolerance and squeeze force, and the distribution of residual stress around the hole was studied by nite element method, it is concluded that the effect of tolerance on the residual stress is more signi cant than that of squeeze force. Furthermore, Zeng et al [36] studied the comprehensive in uence of t tolerance and squeeze force on the fatigue life of riveted lap joints through fatigue test, and found that the interference t is not conducive to the improvement of fatigue life, and the in uence of tensile force on the fatigue life of riveted lap joints is more signi cant than that of t tolerance. Atre et al [37] and Sławinski et al [38] have studied the in uence of geometric defects on the fatigue performance of riveted structures by the nite element method.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: In Uence Of Hole Diameter On Interference Distribution and Msupporting

confidence: 87%

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

Self Cite

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“…21 The appropriate interference fit is believed to improve fatigue performance and bearing capability of the joints, which is attributed to the residual compressive stresses around the joint hole leading to crack initiation positions away from the hole edge. 22,23 But the excessive driven head size and interference lead to local defection at the driven head 24 and fretting wear, 25 which adversely affects the fatigue performance of riveted joints. In addition, the choice of sheet material has a meaningful impact on the shear performance and energy absorption performance of the riveted joint.…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation on press joining mechanism and bearing behavior of single-lap composite riveted joints

Xuan³

et al. 2022

Journal of Composite Materials

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This paper reports an experimental study on the forming mechanism and bearing behavior of single-lap composite riveted joints with different hole diameters (4.82 mm and 4.9 mm) and squeeze forces (15 KN, 18 KN, 20 KN, and 23 KN). Pressure riveting and tensile tests are conducted to composite riveted joints to obtain the joint interference, joint stiffness and bearing strength needed to quantitatively evaluate their deformation features and mechanical properties. Furthermore, microscopic studies on damaged areas using applying ultra-depth three-dimensional microscope to monitor damage evolution are conducted to comprehend the joint shear failure mechanism. Results show that the hole diameter and riveting force have a significant effect on the performance of the joint. The forming damage occurs mainly in the hole wall near the driven head and is dominated by fiber crushing and interfacial shear cracks. The radial expansion of the rivet shank is not uniform under the riveting force and the whole is drum shaped. But the hole expansion of the joint at 4.82 mm hole diameter is more uniform than 4.9 mm, which would lead to better joint stiffness and bearing strength. Moreover, high interference fit would cause the shear fracture of the rivet, while lower interference joints are dominated by compression-pull mixed failure. In general, the size of interference fit is an unneglectable factor in the composite riveted joints that should be thoroughly investigated.

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“…The increased squeeze force can improve the fatigue life of riveted joints, which is attributed to the location of the largest secondary bending far away from the edge of the hole, and the load transmitted by friction increases (Skorupa et al, 2015, Skorupa et al, 2015). The higher clamping force also causes compressive residual stress around the hole, which is another reason for the increased fatigue life (Zeng et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…However, in the process of automatic drilling and riveting, the hole perpendicularity error and squeeze force may cause changes in the sizes of the driven rivet head, which will affect the mechanical behavior of riveted joints. Therefore, studying the reliability of the riveted joints is of great significance to improving the safety of the overall structure of the aircraft (Lei, Bi, Li, & Ke, 2017; Zeng, Xue, Liu, & Tian, 2020).…”

Section: Introductionmentioning

confidence: 99%

Effect of hole perpendicularity error and squeeze force on the mechanical behaviors of riveted joints

Tian

et al. 2021

Microscopy Res & Technique

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In the automatic drilling and riveting process, the perpendicular error of the hole is inevitable, which has a great influence on the assembly quality. In the current research, the shear and pull-out behaviors of riveted joints under different perpendicularity errors and squeeze forces were investigated and compared by the quasi-static tests. The fracture of the failed samples was characterized by a scanning electron microscope and the formation process of fracture was discussed. The failure mechanisms of riveted joints were analyzed in detail to guide engineering applications. The test results demonstrated that the shear load and pull-out load of riveted joints increased slightly with the increase of the tilt angle from 0 to 4 . The perpendicularity error did not affect the shear and pull-out failure modes of the riveted joints.However, the squeeze force had a significant effect on the failure modes of the pullout samples. Fracture analysis showed that the failure of all shear samples occurred at the rivet shaft. Besides, when the squeeze force increased from 15 kN to 23 kN, the failure modes of the pull-out samples changed from the sheet to the rivet itself.

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Design variables influencing the fatigue of Al 2024-T3 in riveted aircraft lap joints: Squeeze force and initial fit tolerance

Cited by 21 publications

References 34 publications

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

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

An experimental investigation on press joining mechanism and bearing behavior of single-lap composite riveted joints

Effect of hole perpendicularity error and squeeze force on the mechanical behaviors of riveted joints

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