scholarly journals Hole-Edge Corrosion Expansion Monitoring Based on Lamb Wave

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1469
Author(s):  
Xiangyu Wang ◽  
Wei Dai ◽  
Duo Xu ◽  
Weifang Zhang ◽  
Yunmeng Ran ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Stress Concentration ◽  
Lamb Wave ◽  
Damage Index ◽  
Corrosion Damage ◽  
Critical Issue ◽  
Alloy Structure ◽  
Imaging Algorithm ◽  
Hole Edge ◽  
Hole Structure

Corrosion is a critical issue for engineered metallic components in mechanical and aerospace industries. Due to the complexity of aerospace aluminum alloy structure, corrosion is particularly tend to occur and expand in stress concentration areas, such as the edge of a hole, which causes the overall structure to be more likely to fail. In this paper, a Lamb wave-based active sensing method with improved sensors network was used to detect the hole-edge corrosion expansion. A0 wave packet of Lamb wave is extracted from signals, and two damage factors are used as characteristics of the signals. Probabilistic imaging algorithm is used to imaging and quantify the hole-edge corrosion area. Five corrosion extension tests show that the proposed method can effectively locate and quantify the hole-edge corrosion damage expansion of a single-hole structure; furthermore, the normalized amplitude damage index and phase change damage index can be used to predict hole-edge corrosion expansion effectively.

Wave packet separation based corrosion damage detection for aircraft structures

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1029-1038
Author(s):  
Chao Zhang ◽  
Taifeng Zhang ◽  
Yu Guo ◽  
Hongli Ji ◽  
Jinhao Qiu ◽  
...  
Keyword(s):  
Wave Packet ◽  
Damage Detection ◽  
Lamb Wave ◽  
Latent Variable ◽  
Damage Index ◽  
Corrosion Damage ◽  
Variable Model ◽  
Aircraft Structures ◽  
Damage Indices ◽  
Safety And Reliability

To guarantee the safety and reliability of aircraft structures, Lamb wave based structural health monitoring has been widely used in recent years. However, there are several factors that severely restrict its practical application, such as dispersion effect and complex boundary reflection. The overlap and deformation in wave packets make it difficult to extract the damage characteristics from the complex Lamb wave signals. To tackle this problem, a latent variable model based wave packet separation method is developed in this paper. Aimed at corrosion damage detection, several damage indices are investigated experimentally. By choosing the most sensitive damage index, the validity and the accuracy of the proposed method in corrosion damage detection are demonstrated through the corrosion experiments.

Sustainment Engineering and Residual Life Prediction of Aluminum Alloy Structure at Service Environment

2013 ◽  
Vol 661 ◽  
pp. 124-127
Author(s):  
Qian Zhang ◽  
Gang Liu ◽  
Cun Li Wu
Keyword(s):  
Aluminum Alloy ◽  
Life Prediction ◽  
Structural Integrity ◽  
Residual Life ◽  
Fatigue Cracks ◽  
Corrosion Damage ◽  
Life Extension ◽  
Alloy Structure ◽  
Service Environment ◽  
Residual Life Prediction

The effects of service environment will cause corrosion damage and fatigue cracks to initiate and grow, compromising structural integrity of the aircraft aluminum alloy structure. To develop an effective inspection and maintenance-scheduling program that takes advantage of life extension technologies, the sustainment engineering and residual life prediction method of aging aircraft aluminum alloy structure at service environment was proposed in this article. The whole algorithm of the sustainment engineering was described and the included situations of repairs, corrosion damage and widespread fatigue damage on aircraft structures were presented. At last, combining the results of FEM calculation with the AFGROW software of crack growth analyses, the residual life of corroded aluminum alloy structure was estimated.

Life Prediction of Aluminum Alloy Structure Subjected to Corrosion Fatigue and Corrosion Damage

2012 ◽  
Vol 166-169 ◽  
pp. 1887-1890
Author(s):  
You Hong Zhang ◽  
Qian Zhang ◽  
Xin Long Chang ◽  
Chun Guo Yue ◽  
Shi Ying Zhang ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Fatigue ◽  
Life Prediction ◽  
Corrosion Damage ◽  
Simulation Method ◽  
Life Cycles ◽  
Ansys Software ◽  
Alloy Structure ◽  
Corrosion Fatigue Crack ◽  
Corrosion Fatigue Crack Growth

The strength of the aging structure deteriorates mainly as a result of corrosion and fatigue damage. In this paper, the life prediction methods of corroded and corrosion fatigued aluminum alloy structure were proposed. The stress multiplication of aluminum alloy structure subjected to corrosion damage was simulated by ANSYS software. We proposed the AFGROW software simulation method to predicate the numerical simulation of corrosion fatigue crack growth. At last, the life cycles of structures subjected to corrosion damage and corrosion fatigue were estimated, and a very good performance of the proposed methods are achieved after validation with the experimental data.

Appraisal Parameters of Corrosion Damage of Aged Aluminum Alloy Material

2012 ◽  
Vol 166-169 ◽  
pp. 1127-1130
Author(s):  
You Hong Zhang ◽  
Qian Zhang ◽  
Xin Long Chang ◽  
Chun Guo Yue ◽  
Shi Ying Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Experimental Observation ◽  
Corrosion Damage ◽  
Average Depth ◽  
Fatigue Load ◽  
Alloy Structure ◽  
Surface Corrosion ◽  
Alloy Material

The corrosion fatigue character of aluminum alloy material was investigated. The aluminum alloy specimens were pre-corroded in different corrosive solutions and then were tested under fatigue load. The two key parameters of describing corrosion damage, surface corrosion damage ratio and average depth of corrosion damage, were analyzed using experimental observation and finite element method. The preliminary results indicated that the two key parameters could be the appraisal parameters for corrosion damage of aluminum alloy structure.

Study on Corrosion Damage Rule for Two Type of Aluminum Alloy

2014 ◽  
Vol 599-601 ◽  
pp. 111-113
Author(s):  
Dan Feng Zhang ◽  
Xiao Ming Tan ◽  
Dan Gui Zhang ◽  
Fang Zhang ◽  
Wei Zhang
Keyword(s):  
Aluminum Alloy ◽  
Statistical Analysis ◽  
Marine Environment ◽  
Corrosion Test ◽  
Corrosion Damage ◽  
Aircraft Structure ◽  
Accelerated Corrosion ◽  
Damage Repair ◽  
Accelerated Corrosion Test ◽  
Damage Rule

Corrosion exists everywhere. It’s very widespread that the aluminum alloy aircraft structure suffers the corrosion damage under the marine environment particularly. The equivalent accelerated corrosion test of the new aluminum alloy 2B06 and 7B04 was carried out.Corrosion damage was inspected and measured through microscope. The rule of the corrosion damage can be obtained by statistical analysis. And which can supply the reference basis for the corrosion damage repair and evaluating the calendar life.

Anticorrosive and hydrophobic properties of carbonic acid films on surface of D16 aluminum alloy

2021 ◽  
pp. 23-29
Author(s):  
A. M. Semiletov ◽  
◽  
A. A. Kudelina ◽  
Yu. I. Kuznetsov ◽  
◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Carbonic Acid ◽  
Corrosion Damage ◽  
Textured Surface ◽  
Hydrophobic Properties ◽  
Polarization Measurements ◽  
Protective Films ◽  
Surface Irregularities ◽  
Average Size ◽  
Optimal Type

The production possibility of protective films of higher carboxylic (lauric, stearic (SA), oleic and linolenic) acids on a laser-textured surface of an aluminum alloy D16 is discussed. It is shown that such a modification leads to superhydrophobization (SHP) of the alloy surface. The most optimal type of laser processing has been determined: laser power is 12 W and the pass speed is 1000 mm / s. Profilometric measurements determined the average size of surface irregularities which is 6,47 microns. The degradation results of the SHP state in an aqueous solution of 0,05 M NaCl indicate greater stability of films formed from SA solutions. The protective ability of the coatings was evaluated by polarization measurements and corrosion tests in a salt chamber. It was found that films formed from an SA solution had the best anticorrosive properties. According to polarization measurements, an increase in ΔEpt = 220 mV, and the time of the first corrosion damage appears τcor = 384 h.

Influence of Stress Concentration on Fatigue Property of Welded Joints of 5083 Aluminum Alloy

2013 ◽  
Vol 456 ◽  
pp. 451-455
Author(s):  
Jun Yang ◽  
Bo Li ◽  
Qiang Jia ◽  
Yuan Xing Li ◽  
Ming Yue Zhang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Stress Concentration ◽  
Welded Joints ◽  
Weld Zone ◽  
Fatigue Property ◽  
Concentration Coefficient ◽  
5083 Aluminum Alloy ◽  
Stress Concentration Coefficient

Fatigue test of the welded joint of 5083 aluminum alloy with smooth and height of specimen and the weld zone than the high test measurement and theoretical stress concentration coefficient calculation, the weld reinforcement effect of stress concentration on the fatigue performance of welded joints. The results show that: Smooth tensile strength of specimens for 264MPa, fatigue strength is 95MPa, the tensile strength of the 36%. Higher tensile strength of specimens for 320MPa, fatigue strength is 70MPa, the tensile strength of the 22%. Higher specimen stress concentration coefficient is 1.64, the stress concentration to the weld toe becomes fatigue initiation source, and reduces the fatigue strength and the fatigue life of welded joints.

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