Finite element modeling and optimization of load transfer in multi-fastener joints using structural elements

Ekh, Johan; Schön, Joakim

doi:10.1016/j.compstruct.2007.01.005

Cited by 76 publications

(32 citation statements)

References 18 publications

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“…Thus, the effect of manufacturing tolerances in the holes can be investigated as well as the effect of changing the fastener pattern or the properties of individual fasteners. Good agreement with experiments and detailed 3D continuum FE-models in terms of fastener load distribution was obtained with this technique [7]. The model is used to calculate fastener loads, N , fastener moments, M , as defined in Fig.…”

Section: Review Of the Structural Modeling Techniquementioning

confidence: 74%

“…Connector elements are used for two purposes; to represent the contact, including friction, between member plates and to implement the bolt-hole clearance. The original version of the technique presented in [7] utilized four connector elements to represent a single fastener, one at each connection between the fastener and a member plate, and two to maintain the separation between the member plates. In the present study, the latter two has been replaced by a single connector, according to Fig.…”

Section: Review Of the Structural Modeling Techniquementioning

confidence: 99%

“…More details can be found in [7]. The technique was developed for prediction of load transfer in complex, multi-fastener joints, taking into account bolt-hole clearance, bolt clamp-up and friction between member plates.…”

Section: Review Of the Structural Modeling Techniquementioning

confidence: 99%

“…The method accounts for all important joint parameters, is computationally effective and can be used for large scale structures, involving a large number of fasteners, and for optimization. This is achieved by extending the structural modeling technique developed by Ekh and Schön [7], such that the local stress field can be estimated, and applying the fiber micro buckling criterion developed by Slaughter et. al.…”

Section: Introductionmentioning

confidence: 99%

“…bolt-hole clearance, friction and fastener clamp-up, whereas the detailed methods are too computationally expensive to be used in analysis of large scale structures or in optimization. A method to calculate the load distribution for a general structure, and accounting for the above parameters, was developed by Ekh and Schön [7]. The method did not include calculation of local stresses.…”

Section: Introductionmentioning

confidence: 99%

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Simple and efficient prediction of bearing failure in single shear, composite lap joints

Ekh

Schön

Zenkert

2013

Composite Structures

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PostprintThis is the accepted version of a paper published in Composite structures. This paper has been peerreviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the original published paper (version of record):Ekh, J., Schön, J., Zenkert, D. (2013) Simple and efficient prediction of bearing failure in single shear, composite lap joints. AbstractA straightforward procedure to predict bearing strength in bolted composite structures has been developed. The method is based on a finite element analysis, using structural elements, followed by a post-processing procedure. Bolt-hole clearance, friction between member plates, fastener clamp-up and fastener deformation is accounted for. Forces calculated in the FE-analysis are converted into a local stress field which is used in an existing criterion to predict fiber micro buckling in the most critically loaded lamina. Predictions were compared with experiments which validated the method. The small computational cost required by the procedure suggests that the method is applicable on large scale structures and suitable to use in conjunction with iterative schemes such as optimization and statistical investigations.

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Section: Review Of the Structural Modeling Techniquementioning

confidence: 74%

Section: Review Of the Structural Modeling Techniquementioning

confidence: 99%

Section: Review Of the Structural Modeling Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simple and efficient prediction of bearing failure in single shear, composite lap joints

Ekh

Schön

Zenkert

2013

Composite Structures

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Tensile behavior analysis of CFRP (carbon‐fiber‐reinforced‐polymer)–titanium joint under preload

Shi

Zhao

et al. 2023

Polymer Composites

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Compared with the traditional connection (bonding and bolting), the hybrid connection has attracted increasing attention in various fields for its better mechanical properties. Some research demonstrates that providing preload, a necessary condition for bolted connection increases the strength of the conventional bolted joint. However, those research depends on the test procedure, and there are few studies on the mixed joint. In this paper, we studied the tensile behavior of CFRP（carbon‐fiber‐reinforced‐polymer)/titanium alloy multi‐bolt hybrid bonded/bolted (HBB) joints under preload with multiple parameters, such as the size of preload, the number of bolts, and the way of connection. A finite element model of joint strength prediction under preload based on the 3D Hashin failure criterion was established and combined with experimental verification. This work reveals that: The preload can effectively reduce the stress concentration around the bolt hole of CFRP laminate and enhance the strength of the mechanically fastened joints. As for the HBB joint, the simulation results of the scalar stiffness degradation (SDEG) of the adhesive layer indicate that the application of preload can also effectively slow down the failure process of the joint and has a significant impact on the strength of the joint. However, for the single‐bearing full‐thread bolted joint, the sizeable preloading force will lead to the extrusion deformation of the bolt thread and screw, and excessive preloading may even lead to the shear failure of the bolt.

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Research on Solution Technology of Large-Scale Joint Elements Based on Augmented Lagrange Theory

Zhang,

Wang,

Chang

et al. 2023

Lecture Notes in Mechanical Engineering

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Finite element modeling and optimization of load transfer in multi-fastener joints using structural elements

Cited by 76 publications

References 18 publications

Simple and efficient prediction of bearing failure in single shear, composite lap joints

Simple and efficient prediction of bearing failure in single shear, composite lap joints

Tensile behavior analysis of CFRP (carbon‐fiber‐reinforced‐polymer)–titanium joint under preload

Research on Solution Technology of Large-Scale Joint Elements Based on Augmented Lagrange Theory

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