Simplified progressive failure analysis method for ultimate longitudinal strength of ship

Abstract

The invention discloses a simplified progressive failure analysis method for the ultimate longitudinal strength of a ship. The method comprises the steps of drawing a structure chart of a ship cross section; establishing a discrete calculation model for calculating the ship cross section, numbering discrete nodes, plates, reinforcing ribs, panel units and hard corner units, and assigning coordinate values to the units and the nodes; defining a structural material which comprises the yield limit, a Young modulus and a Poisson's ratio; defining the thickness, initial deformation, residual stress, lateral pressure and ultimate tensile stress of each plate; defining an included angle between a reinforcing rib coordinate system and a local coordinate system, the height and thickness of a web plate, the width and thickness of a wing plate, and a structural proportional limit coefficient; defining the unit number, initial deformation, lateral pressure and structural proportional limit coefficient of each of the panel units and the hard corner units; and based on the simplified progressive failure analysis method for the ultimate longitudinal strength of the ship, derived by a Smith method, performing ultimate bearing capacity analysis on the discrete calculation model for the ship cross section.

Description

technical field [0001] The invention relates to the technical field of ships, in particular to a simplified step-by-step failure analysis method for the longitudinal ultimate strength of ships. Background technique [0002] The complexity of modern ships and the higher requirements for the reliability, efficiency and overall performance of the hull platform require a scientific, powerful and general hull structure design method. The hull longitudinal strength design check is the core work in the hull structure design, and the effectiveness and advancement of its design method are crucial to the performance of the designed ship. [0003] At present, the calculation of the longitudinal ultimate strength of ship hull mainly adopts simplified methods such as initial bending moment method or one-step method. These simplified methods specifically define the "design load" and some typical or symbolic limit states, as well as general requirements such as maximum allowable stress, w...

AI Technical Summary

Problems solved by technology

These simplified methods specifically define the "design load" and some typical or symbolic limit states, as well as general requirements such as maximum allowable stress, without calculating the real specific load response and limit value, and cannot accurately know the hull real safety margin

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