Detection and Monitoring of Fatigue Cracks in Metallic Structures Using Acoustic Emission: Routes to Quantification of Probability of Detection

被引：2
|
作者：
Gagar, D. [1 ]
Foote, P. [1 ]
Irving, P. E. [1 ]
机构：
[1] Cranfield Univ, Sch Appl Sci, Cranfield MK43 0AL, Beds, England
来源：
11TH INTERNATIONAL FATIGUE CONGRESS, PTS 1 AND 2 | 2014年 / 891-892卷
基金：
英国工程与自然科学研究理事会;
关键词：
Acoustic emission; Structural health monitoring; Fatigue crack; Probability of detection;
D O I：
10.4028/www.scientific.net/AMR.891-892.1268
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The performance and reliability of Structural Health Monitoring (SHIM) techniques remain largely unquantified. This is in contrast to the probability of detection (POD) and sensitivity of manual non destructive inspection methods which are well characterised. In this study factors influencing the rates of emission of Acoustic Emission (AE) signals from propagating fatigue cracks were investigated. Fatigue crack growth experiments were performed in 2014 T6 aluminium sheet to observe the effects of changes in crack length, loading spectrum and sample geometry on rates of emission and the probability of detecting and locating the fatigue crack. Significant variation was found in the rates of AE signal generation during crack progression from initiation to final failure. AE signals at any point in the failure process were found to result from different failure mechanisms operating at particular stages in the failure process.
引用
收藏
页码：1268 / 1274
页数：7
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