Assessing buckling strength of stiffened plates as affected by localized initial geometric imperfections

Mouhat, Ouadia; Khamlichi, Abdellatif; Limam, A.

doi:10.1556/irase.4.2013.2.1

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…The stiffened panel is one part of a bulk carrier ship that plays an essential role in supporting the strength of the structure. The structure can increase strength by using stiffened panels without significantly increasing weight [1].…”

Section: Introductionmentioning

confidence: 99%

Effect of design parameters on the ultimate strength and collapse behaviour of stiffened panels

Hanif

Adiputra²,

Prabowo

et al. 2023

J Appl Eng Science

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Research about stiffened panel applications in ships has massively progressed with the amount of several methods to analyze it. Various studies had been conducted on stiffened panels using Finite Element Method (FEM). However, none have thoroughly explored the most optimal and efficient analysis methods and settings. Given the growing importance of FEM in reliability analysis for ship structures, particularly stiffened panels, a comprehensive study comparing different approaches is of paramount significance. Such research would not only streamline time-consuming procedures but also offer invaluable recommendations to advance the field's understanding and practical applications. In this paper, a finite element analysis study was done to analyze the influence of several parameter modeling of stiffened panels not only to achieve the models' ultimate strength value and collapse behavior but also to offer practical recommendations on the most optimal and efficient methods for analyzing stiffened panels through FEM. Conducting modification of three variations of the model configuration, four variations of boundary condition, and four variations of transverse stiffener modeling to compare each other. Running time consumed when simulations are calculated in ANSYS APDL was also being considered. The results showed a significant difference in modifying the model configuration's case, while in contrast, the modification of boundary conditions and transverse stiffener modeling only showed a slight difference in ultimate strength value. In addition, modification of transverse stiffener geometry only gave the difference by around 0.5 MPa. The model configuration case (A1 v A2) showed the most remarkable running time difference, which reached six times difference.

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Section: Introductionmentioning

confidence: 99%

Effect of design parameters on the ultimate strength and collapse behaviour of stiffened panels

Hanif

Adiputra²,

Prabowo

et al. 2023

J Appl Eng Science

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“…Falkowicz and Dębski [10] studied numerical and experimental stability of rectangular plate with rectangular cut-out. Mouhat and et al [11], [12] studied dynamical buckling rectangular stiffened plates with geometric imperfection and effect of pulse duration.…”

Section: Introductionmentioning

confidence: 99%

Buckling analysis of rectangular plates with centered cut-out subjected to in-plane two directions under different boundary conditions

2019

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In this research, buckling behavior of rectangular plates of symmetric and antisymmetric laminated composite having centered circular hole under in-plane static loadings is analyzed with the aid of first shear deformation theory and the finite element method is used to find critical loads. The presence of hole may cause redistribution of stresses in plates with reduction of stability. The aim of the current paper is to find critical buckling load. The loads depend on many parameters like geometric aspect ratios (a/b) and (d/b), plate thickness (t), diameter of the circular hole (d), orientation of ply and boundary conditions. Numerical simulations for various boundary conditions obtained are shown in tables and graphical forms and compared with each other.

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Evaluation of the Applicability of Digital Photogrammetry-Based Initial Imperfections on NLFEM Ultimate Strength Analysis of Ship- Type Stiffened Plates

ÖLMEZ

2024

Gemi Ve Deniz Teknolojisi

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In this study, the effects of initial deflections on the ultimate strength values of ship type stiffened plate structures are discussed and analysed from the point of view of how the initial deflection forms are obtained. Ship stiffened panels are subjected to complex loading conditions during their operational lifespan. Accurate prediction of their strength and failure modes necessitates a thorough understanding of the effects of various imperfections on their behavior. Two primary sources of initial imperfections are considered as buckling mode shapes result of linear eigen value buckling analysis and digital photogrammetry-based measurements. Buckling mode shapes, arising from the manufacturing process are extracted using linear static structural analysis. Digital photogrammetry is employed to capture and quantify imperfections by analyzing high-resolution images of the physical structure. Numerical investigation is conducted by incorporating these two types of initial imperfections into non-linear finite element method (NLFEM) calculations. The buckling mode imperfections are applied as geometric perturbations, while the photogrammetry-based imperfections are incorporated as statistically representative deviations from the ideal geometry. Stiffened panel's structural response is analyzed under longitudinal uniaxial compression. A new NLFEM project schematic has been used instead of procedure given in S.P 01/19 technical circular of Türk Loydu that is no longer in use since Ansys V.2019R2. This is proven by two validation case studies in Ansys 2022R2 version for considering buckling mode initial imperfections. Then a case study is conducted for 3D stiffened plate created by Photomodeler V. 2023.3.0.238 with digital photogrammetry method from fabricated model in a shipyard in Trabzon. NLFEM analysis is carried out for both initially deflected model after eigen value buckling analysis and naturally deflected model after welding operations. The comparative ultimate strength results are quite consistent, and this shows that the digital photogrammetric modelling method can be used in the analysis of ship structural elements.

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Assessing buckling strength of stiffened plates as affected by localized initial geometric imperfections

Cited by 3 publications

References 14 publications

Effect of design parameters on the ultimate strength and collapse behaviour of stiffened panels

Effect of design parameters on the ultimate strength and collapse behaviour of stiffened panels

Buckling analysis of rectangular plates with centered cut-out subjected to in-plane two directions under different boundary conditions

Evaluation of the Applicability of Digital Photogrammetry-Based Initial Imperfections on NLFEM Ultimate Strength Analysis of Ship- Type Stiffened Plates

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