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Prediction of Fatiguelife and Reliability of a Typical Detailin Ship Hull

Author: JiaGuiLei
Tutor: HuangXiaoPing
School: Shanghai Jiaotong University
Course: Design and manufacture of ships and marine structures
Keywords: Ships node Fatigue damage S-N curve Reliability index Stress intensity factor Crack
CLC: O346.1
Type: Master's thesis
Year: 2011
Downloads: 184
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Abstract


Fatigue is caused by damage to ships and offshore structures one of the main . With the ship to large-scale development, the increasing use of high-strength steel , making the ship's fatigue problems are more prominent. In this paper, based on fatigue crack growth fatigue life prediction methods typical of the ship and based on the application node SN curves and fracture mechanics based on the reliability of the ship typical node analysis as the main object of study , the main research contents include: ( 1 ) to infinity center of the plate through crack , for example, using the Green function method for solving some typical loading forms and polynomial distributed load stress intensity factor , and the results and Ansys finite element software to solve the results were compared , while unilateral Ι crack crack surface subjected to arbitrary distribution of the case load of the stress intensity factor used to calculate the Green's function method for complex stress field of the stress intensity factor foundation ; ( 2 ) discussion and analysis of fracture mechanics based fatigue life prediction several commonly used in the model , focused on the crack growth under random loading rate of single- curve model ; ( 3 ) on a T- node weld toe surface cracks amplitude fatigue loads at the crack propagation life were forecasting . Try on a boat deck and double bottom two nodes on fatigue strength of the hull structure using CCS Guidelines simplified calculation method node nominal stress , Weibull distribution generates pseudo-random load fatigue crack propagation life series of calculations . ( 4 ) summarizes the reliability theory in ship and marine structures in the use of methods to typical example node , respectively, based on SN curve method based on fracture mechanics approach , given the reliability of calculating the ship structure node general process to out of the node reliability index β curve with SL , finally in the same node , for example, gives a reliability index as a node in detail the feasibility of structural optimization criteria .

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CLC: > Mathematical sciences and chemical > Mechanics > Solid Mechanics > Strength theory > Fracture theory
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