Study the crack propagation in aluminum plates using modal analysis

2022 ◽  
Author(s):  
Firas Thair Al-Maliky ◽  
Mohammed Fakhir Al-Edhari
Keyword(s):  
Crack Propagation ◽  
Modal Analysis ◽  
Aluminum Plates

Fatigue crack propagation in aluminum plates with composite patch including plasticity effect

2017 ◽  
Vol 232 (11) ◽  
pp. 2122-2131 ◽  
Author(s):  
A Albedah ◽  
Sohail MA Khan ◽  
B Bachir Bouiadjra ◽  
F Benyahia
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Load Ratio ◽  
J Integral ◽  
Electron Microscopic ◽  
Composite Patch ◽  
Aa 2024 ◽  
Aluminum Plates

In this paper, we analyzed experimentally and numerically the behavior of fatigue crack in aluminum plates repaired with bonded composite patch. We studied the behavior of repaired crack in AA 2024 T3 and AA 7075 T6 under two levels of applied fatigue stresses: maximal stresses of 70 and 120 MPa at a load ratio of 0.1. In the experimental part, the fatigue life of unrepaired and repaired notched specimens were determined. In the numerical part, the J integral around repaired and unrepaired crack tips was calculated. The numerical and the experimental results were used to plot the crack velocity (da/dN) as a function of the J integral. The analysis was completed with scanning electron microscopic observations on fracture surfaces of repaired and unrepaired specimens. It was found that patch improves the fatigue life but this improvement is considerably reduced with the increase in the applied fatigue load. The Al 2024 T3 presents better resistance to fatigue crack propagation in both repaired and unrepaired cases.

scholarly journals The Analysis of FBG Central Wavelength Variation with Crack Propagation Based on a Self-Adaptive Multi-Peak Detection Algorithm

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1056 ◽  
Author(s):  
Weifang Zhang ◽  
Meng Zhang ◽  
Xiangyu Wang ◽  
Yan Zhao ◽  
Bo Jin ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Longitudinal Direction ◽  
Detection Algorithm ◽  
Central Wavelength ◽  
Propagation Behavior ◽  
Gauge Section ◽  
Static Tensile ◽  
Fbg Sensors ◽  
Aluminum Plates ◽  
Self Adaptive

We propose a peak seeking algorithm to extract the damage characteristic-variation of central wavelength to monitor the crack damage status in aluminum alloy plates using surface bonded fiber Bragg grating (FBG) sensors. The FBG sensors are sensitive to the uniform and non-uniform strain distribution along their longitudinal direction, and the effect appears in the power spectrum of the reflected light from the gauge section. In this paper, we propose a fast-self-adaptive multi-peak seeking algorithm to detect the central wavelength shifting of the FBG reflection spectrum with the crack propagation. The proposed peak searching algorithm results point to a significant improvement compared to other conventional methods. Then the central wavelength shifting is applied to explain the crack propagation behavior of the aluminum plates under quasi-static tensile test conditions. The different damages feature changing intervals which are associated with the crack position and the FBGs location, demonstrating that central wavelength shifting performs as an indicator to detect structural crack damage.

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