Title of article :
Mixed-mode crack propagation of stiffened curved panels repaired by composite patch under combined tension and shear cyclic loading
Author/Authors :
Hosseini-Toudeshky، نويسنده , , Hossein and Ghaffari، نويسنده , , Mir Ali and Mohammadi، نويسنده , , Bijan، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
Pages :
20
From page :
344
To page :
363
Abstract :
In this study, finite element method is used to investigate the fracture analyses, crack growth trajectory and fatigue life of curved stiffened panels repaired with composite patches subjected to combined tension and shear cyclic loadings. For this purpose, finite element modeling is performed for consideration of real 3-D crack-front in general mixed-mode conditions. Contact elements are used between the crack surfaces on two crack sides to prevent interferences of crack surfaces and a complementary program was developed to handle the automatic fatigue crack growth modeling. The effects of various patch layups and shear–tension loading ratios on fracture parameters of repaired aluminum panels are investigated. It is shown that as the shear to tension ratio increases, the patch layups with orientations of almost perpendicular to the crack trajectory become more efficient in term of fatigue crack growth life when compared with the patch layups parallel to the tension orientation like [ 90 ] 4 . It will be shown that as the effect of shear loading is decreased around the crack-front due to the increasing of stiffener spacing ratio the values of K II are decreased and consequently shear loading effects on tilting the crack trajectories are decreased.
Keywords :
curved panel , Fatigue , Mixed-mode crack growth , Tension and shear , Composite patch , Repair , stiffener , Contact elements
Journal title :
Aerospace Science and Technology
Serial Year :
2013
Journal title :
Aerospace Science and Technology
Record number :
2231001
Link To Document :
بازگشت