Ultimate strength of damaged stiffened panels subjected to uniaxial compressive loads accounting for impact induced residual stress and deformation

Jie Cai, Xiaoli Jiang, Gabriel Lodewijks

Publikation: Kapitel i bog/rapport/konference-proceedingKonferencebidrag i proceedingsForskningpeer review

Abstract

In case of ship accidents, the ship's hull will inevitably suffer from damages such as holes, cracks, dent etc., which will threaten the structural safety of ship. It is essential to study the ultimate strength of damaged ships in order to facilitate the decision-making process of ship salvage. There are considerable publications on the subject, however, the impact of the induced residual stress and deformation are normally excluded in those studies. This paper therefore aims at investigating the effect of the impact induced residual stress and deformation on the ultimate strength of a stiffened panel through application of a nonlinear Finite Element Analysis (FEA) method. Firstly, a literature review on ultimate strength of damaged ships is presented. Secondly, a nonlinear numerical simulation is adopted to investigate the ultimate strength of stiffened panels accounting for residual stress and deformation. this procedure consists of two stages: the impact stage and the static stage. The results of the numerical simulation of both stages are validated through the results of experiments and simulations available in literature. Afterwards, a series of case studies are performed deploying the validated numerical method. Finally, a closed form expression to predict the ultimate strength accounting for impact induced residual stress and deformation is proposed based on direct simulation. Results show that the combined effect of impact induced residual stress and deformation can significantly reduce structures' load carrying capacity. The maximum reduction ratio reaches 37% in local stiffened panel. The method of removal of all the plastic deformation area is generally too conservative to predict the ultimate strength of a damaged local stiffened panel, which will underestimate the residual load carrying capacity of ships considerably.

OriginalsprogEngelsk
TitelStructures, Safety and Reliability
ForlagAmerican Society of Mechanical Engineers
Publikationsdato2015
ISBN (Elektronisk)9780791856499
DOI
StatusUdgivet - 2015
Udgivet eksterntJa
BegivenhedASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2015 - St. John's, Canada
Varighed: 31. maj 20155. jun. 2015

Konference

KonferenceASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2015
Land/OmrådeCanada
BySt. John's
Periode31/05/201505/06/2015
SponsorOcean, Offshore and Arctic Engineering Division
NavnProceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
Vol/bind3

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