Stress concentration factors in tubular T/Y-joints strengthened with FRP subjected to compressive load in offshore structures

Nassiraei, Hossein; Rezadoost, Pooya

doi:10.1016/j.ijfatigue.2020.105719

Cited by 60 publications

(16 citation statements)

References 33 publications

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“…Adding aluminum oxide, Al 2 O 3, nanoparticles to the adhesive makes it stiff with high elastic modulus and increases the adhesive's strength [32,34]. Table 3 shows a comprehensive comparison between peel stress and shear stress after adding 1.5 wt% of Al 2 O 3 nanoparticles into the neat adhesive at different temperatures.…”

Section: Effect Of Temperature and Alumina Nanoparticles On Peel And ...mentioning

confidence: 99%

“…It was also concluded that the researchers mainly focused on investigating the fracture behavior of the interface region in single-lap joints. However, there is a substantial stress concentration on the middle and edge portions, and the investigation of areas with a high stress concentration is compulsory and highly significant [34][35][36]. Therefore, this research involved the development of a methodology to investigate the effects of both increases in temperature and the inclusion of aluminum oxide nanoparticles on the stress behavior at different locations on the adhesive region.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Temperature and Al2O3 NanoFiller on the Stress Field of CFRP/Al Adhesively Bonded Single-Lap Joints

et al. 2022

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In this paper, the effect of aluminum oxide, Al2O3, nanoparticles’ inclusion into Epocast 50-Al/946 epoxy adhesive at different temperatures, subjected to quasi-static tensile loading, is numerically investigated. The single-lap adhesive joint with two different types of material adherends (composite fiber-reinforced polymer (CFRP) and aluminum (Al) 5083 adherends) and adhesive Epocast 50-A1/hardener 946 were modeled in ABAQUS/CAE. A numerical methodology was proposed to analyze the effect on peel stress and shear stress by adding Al2O3 nanoparticles into the neat adhesive at 25 °C, 50 °C, and 75 °C temperatures at four different locations of the adhesive regions: the interface of the adhesive and aluminum adherend (location A), the middle plane of the adhesive region (location B), the middle longer edge (along the length of the adhesive, location C), and the middle shorter edge (along the width of the adhesive, location D). The results showed that adding nanoparticles into the neat adhesive improves joint strength at room and elevated temperatures. High peel and shear stresses were recorded near both edges of the locations (A, B, C, and D). For location A, adding nanofillers into the adhesive resulted in the reduction in peak peel stress by 1.3% for 25 °C; however, it increased by 2.7% and 10.7% for 50 °C and 75 °C temperatures, respectively. Furthermore, the peak shear stress observed a considerable reduction of 19.6% for 25 °C, but it increased by 7.7% and 8.7% for 50 °C and 75 °C temperatures, respectively, for location A. The same trend was also observed for other locations (i.e., B, C, and D). This signified that adding aluminum oxide nanoparticles in the adhesive resulted in increased stiffness at higher temperatures and increased ductility of the joint, as compared to the joint with neat adhesives at room temperature. Moreover, it was observed that locations A and B were more vulnerable to damage initiation, as the peak of stresses lay near the edges, indicating that the crack initiation would take place close to the edges and propagate towards the center, leading to ultimate failure.

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Section: Effect Of Temperature and Alumina Nanoparticles On Peel And ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Temperature and Al2O3 NanoFiller on the Stress Field of CFRP/Al Adhesively Bonded Single-Lap Joints

et al. 2022

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“…Zavvar [24] for SCF design formulae and multiplanarity in KT-joints. As nonoverlapped tubular joints [2] are easy to fabricate and numerous techniques have been developed for assessing their strength and fatigue performances [4,5,[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], they are widely used in the construction of many tubular structures. However, when the brace-to-chord diameter ratio (β) is bigger than 0.6, nonoverlapped tubular joints may not be easily designed due to the limited range of geometric validity in many design codes [25,26].…”

Section: Advances In Civil Engineeringmentioning

confidence: 99%

“…For the past few decades, there have been quite a number of research programs devoted to the study of SCF values and parametric design formulae for various uniplanar tubular joints [3][4][5][6][7][8][9][10][11] and recently for reinforced tubular joints [12][13][14]. On the other hand, as multiplanar tubular joints dominate the practical applications for offshore structures, multiplanarity effects are important in determining the stress distribution at the vicinity of joint intersection.…”

Section: Introductionmentioning

confidence: 99%

A Bracket‐Stiffened Two‐Planar Overlapped Tubular KT‐Joint for Offshore Jack‐Up Fatigue Analysis

Jian

Yue

Qiu

et al. 2021

Advances in Civil Engineering

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There have been a large number of research programs dedicated to the investigation of stress concentration factor and its parametric design formulae for a variety of uniplanar and multiplanar tubular joints. However, for the multiplanar overlapped tubular joints, the related reports are very limited due to the fact that the combining effect between multiplanarity and brace overlapping is quite complex. In this paper, a novel bracket-stiffened two-planar overlapped tubular KT-joint is proposed by adding two brackets between the upper diagonal and horizontal braces to alleviate the stress concentration at the brace-to-chord intersection area. As compared with the original KT-joint and KT-joint of larger brace gap, stress concentration reduction and fatigue strength enhancement at the most critical point of the proposed KT-joint are significant under both axial and in-plane bending (IPB) loads. The superiority of the proposed KT-joint is further tested with a simplified fatigue life assessment of offshore jack-up in field transit condition, when the KT-joint corresponding to the upper guide level is most critical and fatigue-sensitive. The obtained results with conservative assumptions may serve as guides or references in civil and offshore engineering practices.

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“…As presented in [ 22 ], the use of advanced models may allow near real-time design decisions to be obtained in complex connections, such as multi-fastener composite bolted joints under various loading rates, including both static and dynamic load schemes. Less common loading protocols, such as fatigue, have also been studied to propose models for some typical connections to determine their strength, for instance, tubular joints strengthened with fiber-reinforced polymers [ 23 , 24 ]. These kinds of models require preliminary studies and model verification.…”

Section: Introductionmentioning

confidence: 99%

Parametric Study of the Numerical Model of a Bolted Connection of Steel Structure for Photovoltaic Panels

2022

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In the face of the reality that unexpectedly mobilized the governments of most central European countries (including Poland), the development of renewable energy sources (RES) seems to be an important direction. Therefore, both wind parks and solar farms will be constructed at double speed for energetic independence. This urgency makes the market of producers of structures for mounting solar panels also need to adapt quickly to the new situation. New constructions adapted to quick assembly with the use of nutless screw connections seem to be one of the best solutions. These structures must not only be easy and quick to install but also durable, which makes the connections resistant to cyclical loads. The speed of assembly of the substructure can be achieved precisely with the help of nutless connections, but their durability should be carefully analyzed. This article presents parametric analyses of the numerical model of this type of connection. The selection of appropriate numerical models for simulation is of key importance in the fatigue strength analysis of bolted connections. This article investigates two different models used in numerical fatigue analyses performed in the Abaqus FEA and FE-Safe program, namely, traditional bolt with nut and innovative self-tapping nutless bolt. Extended parametric analyses of both numerical models were carried out, which ultimately allowed optimization of the fatigue capacity of the connection.

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Stress concentration factors in tubular T/Y-joints strengthened with FRP subjected to compressive load in offshore structures

Cited by 60 publications

References 33 publications

Effect of Temperature and Al2O3 NanoFiller on the Stress Field of CFRP/Al Adhesively Bonded Single-Lap Joints

Effect of Temperature and Al2O3 NanoFiller on the Stress Field of CFRP/Al Adhesively Bonded Single-Lap Joints

A Bracket‐Stiffened Two‐Planar Overlapped Tubular KT‐Joint for Offshore Jack‐Up Fatigue Analysis

Parametric Study of the Numerical Model of a Bolted Connection of Steel Structure for Photovoltaic Panels

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