Bearing failure of single-/double-shear composite bolted joints: An explicit finite element modeling

Bolted joints are widely used in assembly of composite structures that transmit large loads. The relationship between torque ( T) and preload ( F) is needed to be obtained when using the torque method to tighten bolts. In this paper, the T- F relationship in the process of bolt tightening composite laminates was analyzed through bolt tightening experiments. The variation behavior of friction coefficient in this process was also studied. On this basis, a progressive damage finite element model was established using the improved LaRC05 criterion to analyze the stress and damage of the composite laminate during tightening. The various stages in the bolt tightening were divided and the mechanical properties of each stage were analyzed. The results of the study showed that the thread friction coefficient μth and the bearing friction coefficient μb change with the preload during the tightening process. Its behavior can be described using an exponential function. Serious stress concentration and assembly damage can be formed in the direct extrusion area of the outer edge of the locknut when the composite laminate is bolted. The bolt tightening process of composite laminates can be divided into five stages. Research conclusions are valuable for understanding composite structures and formulating the bolt tightening process.

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“…The linear softening criterion was used in this paper 64 to calculate stress values, as shown in Figure 12.…”

Section: Finite Element Analysismentioning

confidence: 99%

“…Among them, s d represents the stress value after damage occurs, and s represents the maximum stress value without damage. The linear softening criterion was used in this paper 64 to calculate stress values, as shown in Figure 12.…”

Section: Intra-layer Damage Criteria For Composite Laminatesmentioning

confidence: 99%

Research on the relationship between the tightening torque and the preload of composite bolted structures

Yue

Xie

Liu

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…In this paper, ABAQUS finite element software was used for modeling [10][11][12]. A simple modeling method was adopted for finite element simulation of FRP bolted connections.…”

Section: Finite Element Modeling and Verificationmentioning

confidence: 99%

Influence of clearance and type for bolt holes on mechanical behavior of bearing-type bolted FRP connection

Xiao

Dang

Xiong

2022

International Conference on Mechanisms and Robotics (ICMAR 2022)

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Bolted connection is a common connection method for FRP structures and it has the advantages of economy, convenience of construction, easy to replace and so on. It is found that the seismic performance of bolted FRP connection depends on the size and form of bolt hole. In order to study the influences of clearance and type for bolt holes on mechanical behavior of bearing-type high-strength fiber-reinforced polymer (FRP) bolted connection, 14 specimens with type of round and slotted hole, and different bolt-hole clearance were studied under monotonic tension loading based on ABAQUS software. The analysis result showed that the connection stiffness decreased when the bolt-hole was enlarged with round hole, while the failure mode and ultimate bearing capacity were changed slightly either by the hole types or bolt-hole clearance and are negligible. This is beneficial and provides a reference for engineers to adopt different connection forms for FRP structures according to the specific situation of seismic requirements in engineering practice.

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“…The linear softening law 54 was used in the FEM to calculate the stress value during damage development, as shown in Figure 9. e f represents the final failure strain, and is calculated according to formula 10 as…”

Section: Damage Propagationmentioning

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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Bearing failure of single-/double-shear composite bolted joints: An explicit finite element modeling

Cited by 11 publications

References 34 publications

Research on the relationship between the tightening torque and the preload of composite bolted structures

Research on the relationship between the tightening torque and the preload of composite bolted structures

Influence of clearance and type for bolt holes on mechanical behavior of bearing-type bolted FRP connection

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

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