Paper Title:
Guided Wave Acoustic Emission from Fatigue Crack Growth in Aluminium Plate
  Abstract

Acoustic emission (AE) testing is an increasingly popular technique used for nondestructive evaluation (NDE). It has been used to detect and locate defects such as fatigue cracks in real structures. The monitoring of fatigue cracks in plate-like structures is critical for aerospace industries. Much research has been conducted to characterize and provide quantitative understanding of the source of emission on small specimens. It is difficult to extend these results to real structures as most of the experiments are restricted by the geometric effects from the specimens. The aim of this work is to provide a characterization of elastic waves emanating from fatigue cracks in plate-like structures. Fatigue crack growth is initiated in large 6082 T6 aluminium alloy plate specimens subjected to fatigue loading in the laboratory. A large specimen is utilized to eliminate multiple reflections from edges. The signals were recorded using both resonant and nonresonant transducers attached to the surface of the alloy specimens. The distances between the damage feature and sensors are located far enough apart in order to obtain good separation of guided-wave modes. Large numbers of AE signals are detected with active fatigue crack propagation during the experiment. Analysis of experimental results from multiple crack growth events are used to characterize the elastic waves. Experimental results are compared with finite element predictions to examine the mechanism of AE generation at the crack tip.

  Info
Periodical
Advanced Materials Research (Volumes 13-14)
Edited by
R. Pullin, K.M. Holford, S.L. Evans and J.M. Dulieu-Barton
Pages
23-28
DOI
10.4028/www.scientific.net/AMR.13-14.23
Citation
C.K. Lee, J. J. Scholey, P. D. Wilcox, M.R. Wisnom, M. I. Friswell, B.W. Drinkwater, "Guided Wave Acoustic Emission from Fatigue Crack Growth in Aluminium Plate", Advanced Materials Research, Vols. 13-14, pp. 23-28, 2006
Online since
February 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Li Yun Li, F.X. Che, D.A. Liu
Abstract:Multi-crack problems are deeply involved in rock-like material and rock engineering. In order to study the influences of lateral stress and...
1523
Authors: Tomáš Denk, Vladislav Oliva, Aleš Materna
Abstract:A two-parameter constraint-based fracture mechanics approach is used to explain the effect of the constraint on the apparently anomalous...
307
Authors: Masanori Kikuchi, Yoshitaka Wada, Masafumi Takahashi, Yu Long Li
Abstract:Fatigue crack growth under mixed mode loading conditions is simulated using S-FEM. By using S-FEM technique, only local mesh should be...
133
Authors: F. Ricci, F. Franco, Nicola Montefusco
Abstract:In this paper, the mechanisms of propagation of the damage in aluminum panels repaired with bonded composite patches of different mechanical...
597
Authors: Wei Han, Da Zhao Yu, Qing He Fan
Metal alloy Materials
Abstract:The initial discontinuity state (IDS) concept was developed just several years ago in an attempt to describe the as-manufactured or...
1626