Abstract
The present paper discusses the methodology for prediction of fracture parameter, fatigue crack growth life (FC) and inspection interval (II) considering the stiffener effect using Afgrow software of NASGRO crack growth model. Based on numerically predicted normalised stress intensity factor (β) using finite element method (FEM), correction factor (C.F.) in β of un-stiffened panel/plate is introduced to account for the stiffener effect. The β of stiffened plate is further used for prediction of fatigue crack growth life (FC) and II. The fracture parameters of stiffened panel for different crack lengths, stiffener area, and stiffener offset using FEM are predicted, which is further used for estimation of FC and II. The typical numerical prediction of fracture parameter using finite element method and FC with incorporation of C.F. using Afgrow software is compared with published experimental results and analytical prediction which show good conformity.
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Abbreviations
- A 1 and A 2 :
-
Stiffener area 1 and 2, mm2
- B :
-
Hole offset distance, mm
- a crit :
-
Critical crack length, mm
- a crit_edge :
-
Critical edge crack length, mm
- a det :
-
Detectable crack length, mm
- c 1, c 2 :
-
Through crack length, mm
- c s, c t :
-
Corner surface and bore crack length, mm
- ∆K = K max-K min :
-
Difference in stress intensity factor
- D :
-
Diameter of fastener, mm
- E :
-
Modulus of elasticity, GPa
- F :
-
Applied load, N
- K :
-
Stress intensity factor
- K f :
-
Fracture toughness, MPa(m)1/2
- N crit :
-
Critical fatigue crack growth life
- N det :
-
Detectable fatigue crack life
- N 1 :
-
Fatigue crack growth life for corner crack
- N 2 :
-
Fatigue crack growth life for through crack
- N 3 :
-
Fatigue crack growth life for edge crack
- T :
-
Thickness of specimen, mm
- Ta:
-
Attached flange thickness, mm
- W :
-
Width of plate, mm
- Wa:
-
Attached width, mm
- X :
-
Stiffener offset, mm
- β :
-
Normalised stress intensity factor
- β st :
-
Normalised stress intensity factor for stiffened panel
- β us :
-
Normalised stress intensity factor for un-stiffened panel
- υ :
-
Poisson’s ratio
- σ :
-
Nominal stress, MPa
- C.F.:
-
Correction factor
- FC:
-
Fatigue crack growth life
- II:
-
Inspection interval
- SF:
-
Scatter factor
- SIF:
-
Stress intensity factor
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Srivastava, A.K., Arora, P.K. Influence of stiffener on fracture parameter and fatigue crack growth life of a finite aluminium alloy plate. J Braz. Soc. Mech. Sci. Eng. 43, 251 (2021). https://doi.org/10.1007/s40430-021-02968-9
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DOI: https://doi.org/10.1007/s40430-021-02968-9