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A Study of Stress-Strain Relationships of Longitudinal Structural Elements of Bulk Carriers under Vertical Bending Moment
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Abstract
The paper evaluates the stress-strain relationships of different structural element groups of ship structures subjected to longitudinal bending moments at the ultimate limit state (ULS). The incremental-iterative method proposed by the International Association of Classification Societies (IACS) is applied. In this method, the hull cross-section is divided into three groups of structural elements, each assigned to one of six common failure modes. Bulk carriers (BCs) are employed to illustrate the calculation results. Accordingly, the paper presents the stress-strain curves of the different structural element groups, as well as the stress and strain experienced by each structural element at the ULS under hogging and sagging conditions. One notable finding is that the sagging condition generates higher stresses in the ship structure compared to the hogging condition. The top-side tank region experiences the highest stress levels, reaching the material’s yield stress when the ship approaches its ultimate longitudinal bending capacity. Additional discussions are also provided in this paper.
Keywords
Bending moments, limit state, stress-strain relationship, structural element, incremental-iterative method
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References
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