Stress concentration factors in tubular X-connections retrofitted with FRP under compressive load

Nassiraei, Hossein; Rezadoost, Pooya

doi:10.1016/j.oceaneng.2020.108562

Cited by 32 publications

(9 citation statements)

References 24 publications

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“…In Equations ( 6) and (7), it is assumed that σ ∞ is applied parallel to the y-axis at an infinite distance (far field) of a plate containing a straight notch of length 2C subjected to a uniform stress; σ 0 denotes the failure stress of a corresponding non-notched plate.…”

Section: Wn Stress Criteriamentioning

confidence: 99%

“…Equation (10) indicates that when W 2C, T k approaches zero. In this case, T stress can be neglected in Equation (8); in this case, Equations ( 11) and ( 12) can be simplified as Equations ( 6) and (7), respectively. Therefore, the stress failure model of composite laminates with straight slot cracks of finite width proposed here is considered an extension to the original WN stress model.…”

Section: Finite-width Stress Modelmentioning

confidence: 99%

“…No matter whether laminated plates are applied as decorative parts, outsourcing parts, or load bearing components, notch-induced stress concentration presents a common and critical issue in structural analysis [3][4][5][6]. As studied by Nassiraei and Rezadoost, the stress concentration factors (SCFs) in circular hollow-section X-connections retrofitted Polymers 2022, 14, 5552 2 of 29 with fiber-reinforced polymer (FRP) under compressive load have been evaluated [7]. The influence of notch design on failure mode, mechanical behavior, and interlayer damage pattern should be better understood [1,8,9].…”

Section: Introductionmentioning

confidence: 99%

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A New Stress-Based Formulation for Modeling Notched Fiber-Reinforced Laminates

et al. 2022

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Laminated plates are often modeled with infinite dimensions in terms of the so-called Whitney–Nuismer (WN) stress criteria, which form a theoretical basis for predicting the residual properties of open-hole structures. Based upon the WN stress criteria, this study derived a new formulation involving finite width; the effects of notch shape and size on the applicability of new formulae and the tensile properties of carbon-fiber-reinforced plastic (CFRP) laminates were investigated via experimental and theoretical analyses. The specimens were prepared by using laminates reinforced by plain woven carbon fiber fabrics and machined with or without an open circular hole or a straight notch. Standard tensile tests were performed and measured using the digital image correlation (DIC) technique, aiming to characterize the full-field surface strain. Continuum damage mechanics (CDMs)-based finite element models were developed to predict the stress concentration factors and failure processes of notched specimens. The characteristic distances in the stress criterion models were calibrated using the experimental results of un-notched and notched specimens, such that the failure of carbon fiber laminates with or without straight notches could be analytically predicted. The experimental results demonstrated well the effectiveness of the present formulations. The new formula provides an effective approach to implementing a finite-width stress criterion for evaluating the tensile properties of notched fiber-reinforced laminates. In addition, the notch size has a great effect on strength prediction while the fiber direction has a great influence on the fracture mode.

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Section: Wn Stress Criteriamentioning

confidence: 99%

Section: Finite-width Stress Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A New Stress-Based Formulation for Modeling Notched Fiber-Reinforced Laminates

et al. 2022

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“…Some traditional materials have struggled to meet the demands of various industries for their specific strength, stiffness, and other properties as science and technology have advanced. The emergence of composite materials has greatly aided in the development of materials by resolving these issues to a greater extent [1][2][3]. Metal matrix composites have drawn significant attention from various industries, particularly heavy industries, and are increasingly used in many fields such as aerospace, the automobile industry, biomedicine, and electronic packaging.…”

Section: Introductionmentioning

confidence: 99%

Interface stress transfer model and modulus parameter equivalence method for composite materials embedded with tensile pre-strain shape memory alloy fibers

Huang,

Duan,

Wang

et al. 2024

PLoS ONE

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The constitutive model and modulus parameter equivalence of shape memory alloy composites (SMAC) serve as the foundation for the structural dynamic modeling of composite materials, which has a direct impact on the dynamic characteristics and modeling accuracy of SMAC. This article proposes a homogenization method for SMA composites considering interfacial phases, models the interface stress transfer of three-phase cylinders physically, and derives the axial and shear stresses of SMA fiber phase, interfacial phase, and matrix phase mathematically. The homogenization method and stress expression were then used to determine the macroscopic effective modulus of SMAC as well as the stress characteristics of the fiber phase and interface phase of SMA. The findings demonstrate the significance of volume fraction and tensile pre-strain in stress transfer between the fiber phase and interface phase at high temperatures. The maximum axial stress in the fiber phase is 705.05 MPa when the SMA is fully austenitic and the pre-strain increases to 5%. At 10% volume fraction of SMA, the fiber phase’s maximum axial stress can reach 1000 MPa. Ultimately, an experimental verification of the theoretical calculation method’s accuracy for the effective modulus of SMAC lays the groundwork for the dynamic modeling of SMAC structures.

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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 X-connections retrofitted with FRP under compressive load

Cited by 32 publications

References 24 publications

A New Stress-Based Formulation for Modeling Notched Fiber-Reinforced Laminates

A New Stress-Based Formulation for Modeling Notched Fiber-Reinforced Laminates

Interface stress transfer model and modulus parameter equivalence method for composite materials embedded with tensile pre-strain shape memory alloy fibers

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

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