Influence of initial distortion on the structural stress in 3mm thick stiffened panels

Lillemäe, Ingrit; Remes, Heikki; Romanoff, Jani

doi:10.1016/j.tws.2013.07.001

Cited by 29 publications

(28 citation statements)

References 9 publications

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“…This data may then be used within finite element analysis to assess the effect of these distortions on the buckling strength. Lillemäe et al [14] have measured the initial distortion for two assembled panels by welding and have obtained almost the same profile for both of them when considering the transverse direction. However in the longitudinal direction the distortion patterns measured by these authors were quite different for the two tested panels.…”

Section: Finite Element Modelling Of Dynamic Buckling Of Stiffened Pamentioning

confidence: 89%

Effect of loading pulse duration on dynamic buckling of stiffened panels

Mouhat

Khamlichi

2014

MATEC Web of Conferences

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Abstract. Design of stiffened panels requires evaluating their stability under various loading combinations for all possible scenarios regarding material degradation or initial geometric imperfections that could affect them. Both static and dynamic loading conditions are to be investigated for assessing the buckling strength. In this work, dynamic buckling under in-plane uniform axial compression loading having the form of a transient pulse with finite duration is evaluated through nonlinear finite element modelling. A welding induced defect that consists of an initial geometric imperfection modifying the skin plate curvature in the longitudinal direction was incorporated. The Budiansky buckling criterion was employed to predict instability under this dynamic loading. The obtained results have shown that the pulse period yields a drastic effect on the buckling strength. For the considered boundary conditions, half-sine like pulses having periods that are comparable to two times the period of the first mode of natural vibrations of the stiffened plate were found to reduce hugely the buckling strength, with the dynamic buckling load representing almost only half its static value.

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Section: Finite Element Modelling Of Dynamic Buckling Of Stiffened Pamentioning

confidence: 89%

Effect of loading pulse duration on dynamic buckling of stiffened panels

Mouhat

Khamlichi

2014

MATEC Web of Conferences

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“…This data may then be used within finite element analysis to assess the effect of initial distortions on the buckling strength. Lillemäe et al [13] have measured these initial geometric imperfections for two assembled panels by welding and have obtained, when considering the transverse direction, almost the same profile for both of them. However in the longitudinal direction the distortion patterns measured by these authors were quite different for the two panels they have tested.…”

Section: Geometry and Imperfectionsmentioning

confidence: 94%

Effect of pulse duration and shape on dynamic buckling of stiffened panels

Mouhat¹,

Khamlichi²,

Limam³

2016

Pollack Periodica

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Dynamic buckling of stiffened panels under axial compression loading having the form of finite duration pulse was analyzed by finite element modeling. Welding induced defects modifying the skin plate curvature were incorporated. Material degradation in the heat-affected zone was also taken into account. The Budiansky and Roth criterion was employed to predict the collapse load. Various pulse shapes were investigated. The obtained results have shown that the pulse period and profile have severe effects on the buckling strength. For the considered boundary conditions and load pulses up to 56% reduction of the strength was observed in comparison with static buckling.

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“…In these cases, the loaded end can be considered as clamped against bending rotation. This common approach was also considered by Lillimäe et al [2]. However, on the basis of previous studies of stiffened panel structures (e.g.…”

Section: Analytical Model For a Curved Beam And The Related K M Factormentioning

confidence: 99%

“…Prompted by energy efficiency and fuel economy reasons, the structural lightweight design for large-size structures has been in the spotlight of the recent research in several industrial fields. For instance, modern cruise ships have been designed to accommodate an increased number of cabins and open spaces, thus directing shipbuilding towards new solutions in terms of space and weight in order to increase the performance of the structure [1][2][3][4][5]. Thinwalled structures represent an optimum solution to achieve this design target.…”

Section: Introductionmentioning

confidence: 99%

Stress magnification factor for angular misalignment between plates with welding-induced curvature

et al. 2020

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The construction of lightweight structures poses new design challenges as a result of the different mechanics of deformation experienced by thinner-plated structures. Because of a reduced bending stiffness, thin plates are particularly sensitive to welding-induced distortions, which include a curvature, in addition to the axial and global angular misalignment observed on thick plates. The curvature shape and amplitude determine a local angular misalignment at the welded joint, which causes non-negligible secondary bending effects. Therefore, the commonly used stress magnification factors k m solution for flat plates need a further development to include the curvature effect. This study proposes new analytical formulations, which extend the applicability of the existing solutions to the assessment of the structural stress of a curved thin plate under an axial load. The improved formulations are consistent with the geometrical non-linear finite element analysis under compression (up to ∼ 80% of the buckling limit) and tension (up to the yield strength). A sensitivity analysis is presented in order to show the dominant role of the curvature effect in the estimation of the k m factor. Regardless of the load applied, the presence of the curvature causes a flat plate solution inaccuracy greater than 10% when the local angular misalignment is more than 1.25 times higher than the global angular misalignment in the case of a thin and slender structure.

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Influence of initial distortion on the structural stress in 3mm thick stiffened panels

Cited by 29 publications

References 9 publications

Effect of loading pulse duration on dynamic buckling of stiffened panels

Effect of loading pulse duration on dynamic buckling of stiffened panels

Effect of pulse duration and shape on dynamic buckling of stiffened panels

Stress magnification factor for angular misalignment between plates with welding-induced curvature

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