Simplified progressive failure analysis method for ultimate longitudinal strength of ship

A technology of ultimate strength and damage analysis, applied in the field of ships, it can solve the problems of not calculating the load response and limit value, and unable to accurately know the safety margin of the hull, so as to improve the applicability and accuracy.

Active Publication Date: 2016-08-10
CHINA SHIP DEV & DESIGN CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 ma

Method used

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  • Simplified progressive failure analysis method for ultimate longitudinal strength of ship
  • Simplified progressive failure analysis method for ultimate longitudinal strength of ship
  • Simplified progressive failure analysis method for ultimate longitudinal strength of ship

Examples

Experimental program
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Effect test

Embodiment 1

[0065] Calculation of longitudinal ultimate strength of a large bulk carrier.

[0066] Step S1, drawing a cross-sectional view, specifying the model parameters, see the appendix of the manual for the drawing figure 2 .

[0067] Step S2, divide the cross-section of the model

[0068] The connection point of the plate and the plate, the connection point of the rib and the plate is regarded as a node, the joint of the plate and the plate is regarded as a hard corner unit, and the position with a stiffener is regarded as a plate lattice unit. See the attached Figure 3-6 , the model has 113 nodes, 120 plate elements, 94 stiffened plates, and 19 hard corner elements. Simplify the bilge part of the hull into a hard corner unit, and simplify the arc structure of the connecting part of the deck and side into a stiffened plate unit.

[0069] Step S3, defining the structural material, including yield limit, Young's modulus and Poisson's ratio.

[0070] In this example, there is only...

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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...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/17
Inventor 彭正梁韩正君周艳秋
Owner CHINA SHIP DEV & DESIGN CENT
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