Self-loosening behavior of bolt in curvic coupling due to materials ratcheting at thread root

Jiang, Xinyu; Zhi, Li; Wang, Yanping; Pan, Fengqun

doi:10.1177/1687814019841137

Cited by 8 publications

(8 citation statements)

References 36 publications

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“…Load transferred by springs can be calculated by equation (1), in which x represents the displacement of mass points in X direction.…”

Section: Load Distributionmentioning

confidence: 99%

“…Mechanical joints are commonly used in structures due to disassembly and relatively high loading capacity. [1][2][3] Most of the joints in these structures are multi-fastener joints in order to enhance carrying limit. However, mechanical joints require drilling holes which leads to stress concentration and makes joints the weakest positions.…”

Section: Introductionmentioning

confidence: 99%

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An analytical stress model for composite multi-pinned plates considering the combination effects of pin load and bypass load in different positions

Tian

2021

Advances in Mechanical Engineering

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Multi-pin joints are commonly used in engineering due to their high loading capacity. However, affected by coupling relationships between pin load and bypass load, the evaluation of stress state is difficult for composite multi-pin joints. An analytical method is proposed in this paper to calculate stress distribution of these joints under tensile load. Stress functions in this method are created considering the pin load and bypass load, according to a geometry division of the whole plate. Superposition relationships are built for each section type with an influence coefficient of bypass load. Stress components could be obtained by calculation of stress functions when material properties, geometry dimension and load are known. Experiments and finite element method are employed to verify the validation of proposed method. Results show that pin position affects stress state, and mainly embodies in σx. The first pin always gets the highest stress level, while for the other pins the stress is quite similar. Increase pin number will decrease stress level but the effect is relatively small for the first pin.

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“…Load transferred by springs can be calculated by equation (1), in which x represents the displacement of mass points in X direction.…”

Section: Load Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An analytical stress model for composite multi-pinned plates considering the combination effects of pin load and bypass load in different positions

Tian

2021

Advances in Mechanical Engineering

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“…Many researchers have done investigations on selfloosening. 1,2 For the first mechanism, Junker 3 proved that the value of preloaded fasteners decreases when relative motion takes place between the mating threads and the bearing surface of a threaded fastener. Yokoyama et al 4 study the self-loosening phenomena of a bolted joint under rotational load by using a finite element model (FEM).…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on self-loosening of a bolted joint under cyclical temperature changes

Eraliev

Zhang

Lee

et al. 2021

Advances in Mechanical Engineering

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The most commonly used part in engineering fields is threaded fasteners. There are a lot of advantages of fasteners. One of them is that they can be easily disassembled and reused, but a bolted joint can loosen easily when a transversal load is applied. The clamp load of a bolted joint can also loosen slowly when subjected to repeated temperature changes. This paper presents an experimental investigation of the self-loosening of bolted joints under cyclical temperature variation. Experiments are carried out under several cyclical temperature changes with different bolt preloads. Rectangular threaded bolted joints with M12 × 1.75 bolts and nuts are tested in a specially designed testing apparatus. Material of bolt, nut, and plates is a stainless steel. The experimental results show that the high initial bolt preload may prevent the joint from self-loosening and the bolted joint has loosened significantly in the first cycle of temperature changes. From this investigation, the loosening of the bolted joint can be considered as a first stage self-loosening.

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“…Zhang [25] proposed a finite element model that considers the evolution of the wear profile of the thread surface to simulate self-loosening of the bolt under transverse load. Jiang [26] used the finite element analysis to study the bolt self-loosening mechanism in curvic coupling caused by the structural ratcheting under cyclic loading. Baek [27] determined the loosening mechanism of threaded fasteners for complex structures through finite element analysis and experiments.…”

Section: Introductionmentioning

confidence: 99%

Loosening of Bolted Connections under Transverse Loading in Timber Structures

Chen

Wang

et al. 2020

Forests

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Bolted joints are widely used in timber structures, and the loosening of bolt connections will reduce the structural performance. In this paper, a mechanical model of bolt connection for timber structures is established, and the process of bolt loosening under a transverse load is investigated. By using the finite element method to construct an accurate thread model with a helix angle, the thread contact state during the bolt loosening procedure was analyzed in detail, and the factors such as load amplitude, load frequency, load location, and different timber materials on bolt loosening are also studied. In the timber structure, the load amplitude is the main factor affecting the bolt loosening, the decay rate of the preload in the bolted joint is positively correlated with the amplitude of the cyclic transverse load. The frequency of the loading has a smaller effect on the looseness, the preload decreases as the frequency increases. When the load is applied to the smooth rod part of the bolt, the preload force will decrease rapidly, and the distance between the load position and the bolt has no effect on the change in looseness. The decreasing range of the preload is different with different timber material, but the decreasing law is the same. The model can be applied to analyze the loosening rule of bolted connections in timber structures.

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Self-loosening behavior of bolt in curvic coupling due to materials ratcheting at thread root

Cited by 8 publications

References 36 publications

An analytical stress model for composite multi-pinned plates considering the combination effects of pin load and bypass load in different positions

An analytical stress model for composite multi-pinned plates considering the combination effects of pin load and bypass load in different positions

Experimental investigation on self-loosening of a bolted joint under cyclical temperature changes

Loosening of Bolted Connections under Transverse Loading in Timber Structures

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