Effect of secondary bending and bolt load on damage and strength of composite single-lap interference-fit bolted structures

Zhang, Kaifu; Hu, Junshan; Zou, Peng; Cheng, Yuh Jen; Luo, Bing; Cheng, Hui

doi:10.1177/0021998319857463

Cited by 18 publications

(7 citation statements)

References 34 publications

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“…The effect of preload on the mechanical properties of composite structures has also been studied by many scholars. Zhang et al 30 studied the influence of interference-fit size and bolt torque on the mechanical properties of composite single-lap joints. It claimed that the bearing strength of composite joints is more sensitive to bolt torque.…”

Section: Research Backgroundmentioning

confidence: 99%

Effect of preload and shim types on the mechanical properties of composite-aluminium bolted joints

Yue

Chen

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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The influence of both preload and the presence of shim types on the mechanical properties of composite-aluminium single-bolt, single-lap joints were studied in this paper. The load-displacement curve and surface strain field of joints in different shim types and preloads were obtained through tensile experiments. A progressive damage model was established using the UMAT subroutine in ABAQUS. A hybrid failure criterion and a linear continuous degradation model were used to describe the progressive damage of composite laminates. The results show that for joints with no shim and for those with various types of shims, the tensile stiffness, peak load and initial damage load could be reduced when the preload is insufficient or too large. Compared with joints with no shims or with peelable fibreglass shims, joints with liquid shims required a larger preload to achieve the best mechanical properties. As the proportion of peelable fibreglass shim increased, the tensile stiffness and peak load continued to increase in joints with a mixed shim of liquid and peelable fiberglass shim. Shims can serve as tension bearings, but have little effect on the initiation and development of bearing failure.

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Section: Research Backgroundmentioning

confidence: 99%

Effect of preload and shim types on the mechanical properties of composite-aluminium bolted joints

Yue

Chen

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The damage modes and failure mechanisms of the specimens were analyzed by observing the cross‐section morphology. Zhang studied the effect of the coupling of hole perpendicularity error and delamination defects on the damage mode and stress distribution of bolt joints and concluded that the hole perpendicularity error affects the secondary bending effect of the joints, which in turn can affect the stress state at the edge of the hole and the failure mode of the specimen (Zhang, 2018).…”

Section: Introductionmentioning

confidence: 99%

Fatigue properties of riveted joints under different hole perpendicularity errors and squeeze forces

Li,

Tian,

Liao

2024

Microscopy Res & Technique

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Riveting is the most important method of joining sheet metal and is widely used in the assembly of aircraft components. The perpendicularity error of the holes is unavoidable during automatic drilling and riveting, which has a significant impact on the quality of the assembly. In this paper, the effects of hole perpendicularity error and squeeze force on the interference fit size, interface contact state, microstructure morphology, fatigue life, and fracture form of riveted joints were investigated experimentally. The results show that the interference fit size increases with a greater tilt angle. When the tilt angle is 0°, the rivet shank is in close contact with the inner and outer sheets, and there is no obvious gap at the interface between the rivet and the sheets. As the tilt angle increases to 2° and 4°, a gap appears at the interface of regions 1, 2, and 3, while the rivet shank at region 4 is in close contact with the outer sheet. The fatigue life decreases when the tilt angle increases from 0° to 4°. For the same tilt angle, the fatigue life of riveted joints with a 0° tilt direction is higher than that of riveted joints with a 180° tilt direction. Increasing the squeeze force can to some extent reduce the adverse effect of the tilt angle on the fatigue life. The hole perpendicularity error does not affect the failure form, while the squeeze force has a significant effect on the failure form of the specimens.Research Highlights The fatigue life of riveted joints decreases as the tilt angle increases. The size of the interfacial gap increases with increasing tilt angle. Higher fatigue life at 0° tilt direction than at 180° tilt direction. Increasing the squeeze force can somewhat reduce the negative effect of tilt angle on fatigue life.

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“…Other researchers analyzed the comprehensive impact of the interference associated torque for CFRP joints. Zhang et al 22 identified the optimal interference-fit and torque by combing experimental and numerical methods; however, the research did not consider the impact of the preload imbalance. Hu et al 23,24 investigated the mechanism of bolt pre-tightening and preload relaxation in composite interference-fit joint structures, and identified a frictional force.…”

Section: Introductionmentioning

confidence: 99%

Effect of imbalanced interface pre-tightening force on the bearing behavior of carbon fiber reinforced polymer interference-fit lap joint

Lai

Zou³

et al. 2021

Advances in Mechanical Engineering

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Interference-fit is attracting increasing attention in the aerospace field because of its excellent enhancement of the sealing and fatigue life of carbon fiber reinforced plastic (CFRP). However, it also induces imbalanced pre-tightening forces on the interface, and affects its mechanical behavior. A series of experiments were conducted to assess the imbalanced pre-tightening force of CFRP interference bolted joints and its effects. High-precision washer force sensors were used to measure the pre-tightening force between upper and lower surfaces at various interference-fit and torque. Strain gauges were used to estimate the varying effect on the imbalanced pre-tightening force during tensile tests. The effects of varying interference-fit and torque on pre-loaded transfer, surface strain distribution, tensile strength, and damage mode were identified. The results show that the synergy of interference-fit and torque induces an imbalanced pre-tightening force, which, in turn, changes the stress-strain evolution of the surface, and a special “transition regime” was identified in the evolution curves. Compared with clearance-fit, the ultimate strength and optimal torque of interference-fit joints could be significantly enhanced. In addition, the damage originates from fiber/matrix slipping to the upper surface with a low pre-tightening force and the formation of stack buckling, which then causes delamination fracture.

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Effect of secondary bending and bolt load on damage and strength of composite single-lap interference-fit bolted structures

Cited by 18 publications

References 34 publications

Effect of preload and shim types on the mechanical properties of composite-aluminium bolted joints

Effect of preload and shim types on the mechanical properties of composite-aluminium bolted joints

Fatigue properties of riveted joints under different hole perpendicularity errors and squeeze forces

Effect of imbalanced interface pre-tightening force on the bearing behavior of carbon fiber reinforced polymer interference-fit lap joint

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