Ultimate strength of stiffened panels subjected to non-uniform thrust

Anyfantis, Konstantinos N.

doi:10.1016/j.ijnaoe.2020.03.003

Cited by 23 publications

(22 citation statements)

References 23 publications

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“…The LSD [16] includes ultimate limit state (ULS), fatigue limit state (FLS), accidental limit state (ALS), and serviceability limit state (SLS). Among others, a number of studies have been conducted on ULS-based design, technique, and its applications in terms of ULS application to stiffened panels [36][37][38][39], scaling effect [40,41], stiffened panels with opening [42], dynamic ULS [43], low temperature effect [14], and prediction of ULS by an artificial neural network (ANN) [44]. The FLS of an offshore riser by an ANN and simplified method [45,46], the ALS and ULS of a non-ice class aged ship [4,47], a steel plated structure [3], a ship's hull [2], and Floating Liquefied Natural Gas (FLNG) [48,49] are also investigated.…”

Section: Ultimate Strength Calculations By the Non-linear Finite Element Methods (Nlfem)mentioning

confidence: 99%

Ultimate Compressive Strength of Stiffened Panel: An Empirical Formulation for Flat-Bar Type

Kim

Lim

et al. 2020

JMSE

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This research aims to study the ultimate limit state (ULS) behaviour of stiffened panel under longitudinal compression by a non-linear finite element method (NLFEM). There are different types of stiffeners mainly being used in shipbuilding, i.e., T-bar, flat-bar, and angle-bar. However, this research focuses on the ultimate compressive strength behaviour of flat-bar stiffened panel. A total of 420 reliable scenarios of flat-bar stiffened panel were selected for numerical simulation by the ANSYS NLFEM. The ultimate strength behaviours obtained were used as data for the development of closed form shape empirical formulation. Recently, our group proposed an advanced empirical formulation for T-bar stiffened panel, and the applicability of the proposed formulation to flat-bar stiffened panel is confirmed by this study. The accuracy of the empirical formulation obtained for flat-bar stiffened panel was validated by finite element (FE) simulation results of statistical analysis (R2 = 0.9435). The outcome obtained will be useful for ship structural designers in predicting the ultimate strength performance of flat-bar type stiffened panel under longitudinal compression.

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Section: Ultimate Strength Calculations By the Non-linear Finite Element Methods (Nlfem)mentioning

confidence: 99%

Ultimate Compressive Strength of Stiffened Panel: An Empirical Formulation for Flat-Bar Type

Kim

Lim

et al. 2020

JMSE

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“…Nowadays, RSM has many applications in the field of engineering and structural reliability and is used in combination with finite element models (Anyfantis, 2019(Anyfantis, , 2020Arai and Shimizu, 2001;Duc et al, 2013;Gaspar et al, 2012;Kemper et al, 2006;Lee et al, 2015;Rahman et al, 2017;Ranjbari et al, 2020;Yanhui et al, 2010;Meng et al, 2019Meng et al, , 2020a.…”

Section: Ec 394mentioning

confidence: 99%

Construction of surrogate models for predicting the buckling strength of stiffened panels through DoE and RSM methods

Papanikolaou

Anyfantis

2021

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PurposeExperimental mid/large scale testing of ship-like stiffened panels in compression is a quite expensive exercise that is not standard. Numerical simulations are preferred instead. Because of being relatively inexpensive (cost and time wise), most authors perform an exhaustive design space exploration arriving at a significant number of runs. This work demonstrates that the buckling response with respect to the nondimensional slenderness ratios may well be fitted with nine runs per stiffener geometry.Design/methodology/approachEfficient derivation of buckling strength formulas for stiffened panels through the employment of design of experiments (DoE) and response surface methodology (RSM) combined with numerical nonlinear experimentation over the entire range of practical geometries.FindingsThe surrogate model developed for T-bar stiffeners predicts accurately enough the ultimate stress in the practical design area, while the surrogate models for angle bars and flat bars demonstrate difference between 10 and 30% from common structural rules (CSR).Originality/valueTo the authors' best knowledge, the statistical-based formal and rigorous approach of DoE and RSM to obtaining buckling surfaces for stiffened panels is performed for the first time. The number of required observations per stiffener type has not been addressed yet as each work selects its own sampling scheme without formal reasoning. This work comes to frame the number of observations for efficient surrogate model building.

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“…First, the hull girder strength was assessed according to cross-section inertial properties followed by local calculation of plates thickness and cross-section of primary and secondary stiffeners. Structures which effect on the structural arrangement are considered local were calculated according to rules calculations [7] [8]. The structure Von Mises stress levels were compared with limit values allowed by the classification societies.…”

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confidence: 99%

“…The 6000 series alloys are not as corrosion resistant as the 5000 series, but are easier to extrude, making them attractive for producing structural shapes [14]. Additionally, it must be considered that imperfections resulting from welding processes such as the permanent deflection of plates, might imply an 18% decrease in tensile properties and an increase in buckling failures probabilities [7] [15]. Aluminum plates and stiffeners must have a stiffness equivalent to steel counterparts as a design criterion [16].…”

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confidence: 99%

“…The structural arrangement assessment from rules and guidelines of the classification societies, which calculations are generally of semi-empirical nature and also are calibrated to secure the lifespan expected, allow a simplified approach of complex structural problems [7]. However, classification societies' rules might imply suppositions that can only be used with certain limits, then, those calculations might not fit well to the studied arrangement and the obtained structural arrangement could have a more effective and lighter alternative.…”

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Design and validation by the finite element method of the structural arrangement of a riverine low draft combat boat

Alvarado

Flores

Paipa

2021

cienc. tecnol. buques

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Inland navigation in shallow waters with partially submerged objects and riparian vegetation might represent severe restrictions to patrolling operations of the Colombian Navy. Consequently, there is a need for a riverine combat and reconnaissance boat with the ability to operate in 0.4 m depth shallow waters and which structural arrangement is to be designed according to maritime classification societies and operational requirements of the navy. The aim of this work is to explain and to validate the 20 knots, 3.8 tons of displacement, 8.6 m length, 2.6 m beam and 0.35 m draft boat scantling by guidelines of the classification societies and hence, improving and validating by direct analysis the hull structural arrangement.

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Ultimate strength of stiffened panels subjected to non-uniform thrust

Cited by 23 publications

References 23 publications

Ultimate Compressive Strength of Stiffened Panel: An Empirical Formulation for Flat-Bar Type

Ultimate Compressive Strength of Stiffened Panel: An Empirical Formulation for Flat-Bar Type

Construction of surrogate models for predicting the buckling strength of stiffened panels through DoE and RSM methods

Design and validation by the finite element method of the structural arrangement of a riverine low draft combat boat

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