Torsion and Shear Stresses in Ships


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The marginal distance between the hatch end and the side shell is approximately 1. This is done so as to maximise the space for the stowing of containers. It is often seen that the main deck is subjected to high torsional moments and racking effects and the deck spacing in the way of the hatch opening along the transverse is very less. As a result, the stress concentration can lead to cracking at the corners of the hatches or crack the deck itself!

In order to prevent such failures, torsion boxes are fitted with welded joints on the side shell as on the deck plating which prevent the torsion produced by twisting. Therefore, while designing ships with large openings like container ships it is often ensured that proper FEM analysis and model testing procedures are carried out. Proper strength analysis of the hull and deck plating should be done. At points of stress concentration i. I saw this problem on a big Iron ore carrier due mistake of ballast tank maintenance.

Ships with closed sections will have inherent strength to resist torsion. Since large deck openings are a functional requirement for ships such as container vessels, there will be significant reduction in torsional strength.

What Is The Purpose Of “Torsion Box” In Ships?

This can jeopardize the vessel in an oblique sea. These are the Torsion Boxes. Members constituting Torsional boxes are of higher scantlings. Care should be taken to ensure continuity and smooth transition to the adjoining structure to avoid high stress concentration. Watch list is full. This amount is subject to change until you make payment.

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Stresses in Ships

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TRANSVERSE STRESSES

Introduction to Engineering Modeling and Problem Solving. Localised heavyweights, e. Torsion box in ships can be defined as a continuous structure formed in between the top part of a longitudinal bulkhead, freeboard deck and sheer strake. The stresses are resisted by all continuous longitudinal material especially those parts further from the neutral axis. Email to friends Share on Facebook - opens in a new window or tab Share on Twitter - opens in a new window or tab Share on Pinterest - opens in a new window or tab Add to watch list. More information about the author is available online at.

Seller assumes all responsibility for this listing. Item specifics Condition: Very Good: A book that does not look new and has been read but is in excellent condition. No obvious damage to the cover, with the dust jacket if applicable included for hard covers. May be very minimal identifying marks on the inside cover. Very minimal wear and tear. See all condition definitions - opens in a new window or tab Read more about the condition.

We have been active in the book trade for over ten years and have been an active Ebay member since All of our books are carefully cleaned and restored to the best possible condition prior to being offered for sale. TO compensate for this, the bottom is strengthened to 0. Plate floors are fitted on each frame station transverse framing or alternate frame stations longitudinal framing with intercostal side girders not more than 2.

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The four strakes of shell plating either side of the keel are generally increased in thickness in the pounding region. When the vessel is allowed to settle on the keel blocks before side blocks are positioned, transverse stresses will be induced in the structure, and it will have the tendency to sag at the bilges. These stresses are resisted by the double bottom structure floors, etc. Longitudinal stresses are created since the vessel generally grounds aft first and this creates longitudinal bending stress on the ship.

Resistance to the stresses will be by all longitudinally continuous material, particularly those items furthest from the neutral axis. High pressures are created aft as the vessel grounds aft first and this increases to a maximum as the water level drops and the vessel is about to take to the blocks along its full length. The ship structure is strongly constructed in this area as it is and the blocks in the docks are reinforced and tied together with steel ribbands.

Ship Construction Part 3, Global and Local Stresses

Localised heavyweights, e. Deck openings, holes cut in the deck plating, i. Other examples are stress set up by stays, shrouds, stresses set up in the vicinity of hawsepipes, windlass, and winches, etc. Vibration from engines, propellers, etc.

Stresses in Ships

These are resisted by extra stiffening in the double bottom under the machinery spaces in the region of the stern and afterpeak. Impulsive forces that arise when severe pitching results in slamming pounding at the fore end cause the ship to vibrate at its natural frequency. These will be dampened along the ship length until coming to rest.

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This also occurs on container ships in adverse weather when pitching was not heavy. This potentially gives the worst vibration resonance possible. The resultant flexing of the hull could be observed along the line of the deck containers. The normal method of detection is by longitudinal strain records.