Sobre a modelagem da propagação de trincas por fadiga em estruturas de cascas pressurizadas. / On the modeling of fatigue crack propagation in pressurized shell structures.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The modeling of fatigue crack growth in pressurized fuselages is very complex due to many factors, such as the nonlinear stiffening effect referred to as bulging, the fuselage skin being very thin and the presence of stiffeners which modifies the stress distribution on the fuselage. A methodology for the computational modeling of the fatigue crack growth in pressurized shell structures, based on the finite element method and concepts of Linear Elastic Fracture Mechanics, is presented. As a result of this numerical simulation, the crack trajectory and the fatigue propagation life are obtained. A parametric study is performed to investigate the influence of several parameters, such as skin thickness, pressurization level, crack length, structural area of the stiffeners, distance between stiffeners, on the bulging effect for unstiffened and stiffened pressurized shells. The methodology is validated by means of a fatigue crack propagation simulation in a Boeing 737 airplane fuselage. The results of this simulation are compared with experimental results and those obtained by POTYONDY (1993). Additionally, the influence of the crack increment and the number of nodes per element (8 or 9 nodes) on the simulation results are investigated.

ASSUNTO(S)

finite element method fadiga fatigue fuselagens método dos elementos finitos propagação de trinca shells bulging cascas fuselages crack propagation bulging

ACESSO AO ARTIGO

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