Abstract
A robust methodology to simulate virtually the residual stresses pattern in welded steel plates is presented. The methodology is applied to the structural analysis of typical welded plates belonging to ship structures, and the effect of residual stresses on the elastoplastic behavior of plates loaded axially is analyzed in comparison to the residual stress free case, both for tension and compression and including initial imperfections. Residual stresses affect in different manner plates with different geometries; thus a parametric study is performed covering the usual range of variation of the most important plate parameters that control the strength of the plates, more precisely the slenderness and the aspect ratio. The results from finite elements analysis are compared with codes and most established formulations and recommendations of applicability in the prediction of load-shortening curves for hull’s bending strength evaluation, ultimate strength and ultimate strain of plate elements are made.
Highlights
IntroductionThe study of unstiffened plates under different loading conditions has been object of very deep and extensive analysis along time in relation to the effect of the most important parameters that influence the ultimate strength of such plates
The study of unstiffened plates under different loading conditions has been object of very deep and extensive analysis along time in relation to the effect of the most important parameters that influence the ultimate strength of such plates.Plate elements are a fundamental component of stiffened plates that are the basis of structural strength of thin-walled structures evaluation
The present methodology proved to be very efficient on the structural analysis of plate elements with residual stresses
Summary
The study of unstiffened plates under different loading conditions has been object of very deep and extensive analysis along time in relation to the effect of the most important parameters that influence the ultimate strength of such plates. In the particular case of the hull girder strength assessment, the structure may be considered to be formed by a set of stiffened plates each of them contributing to resist the applied bending moment and other loads [1,2,3]. The evaluation of the residual stresses distribution along the structure has been concentrated in three main fields: development of non-destructive and destructive techniques [5], use of finite element methods and analytical studies associated with the mechanical characteristics of the different material and welding techniques. Tekgoz et al [12] analyzed the effect of residual stress on the ultimate strength assessment of a stiffened panel by a nonlinear finite element method They develop modified stress strain curves in order to include a model of residual stresses on material properties. The present methodology allows to implement residual stresses in direct way by using the concept of heat affected zone (HAZ) and mechanical and thermal properties of the material
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