NDLI: Identification of Crack Initiation in Aluminum Alloys using Acoustic Emission

Content Provider	Springer Nature Link
Author	Vanniamparambil, P. A. Guclu, U. Kontsos, A.
Copyright Year	2015
Abstract	This paper uses multiple specimens, mechanical loading setups and nondestructive evaluation (NDE) techniques to reliably identify crack initiation in aluminum alloy specimens and quantify the associated Acoustic Emission (AE) activity. Compact Tension (CT) and Middle Tension (MT) specimens were tested until crack initiation was verified using optical methods while simultaneously recording AE, Infrared Thermography (IRT) and Digital Image Correlation (DIC). The specimens were loaded under tension and fatigue loading conditions with the prime focus being on identifying, in these controlled experiments, the most sensitive AE features to crack initiation. The changes of such AE features at the time instance of crack initiation was cross-validated by the complementary optical metrology data. In addition to the load drop accompanying the ductile failure process, the synchronous use of the optical NDE techniques provided the opportunity to associate the mechanical behavior of the material to the AE recordings observed during testing. The identified changes in AE features were combined with extensive signal processing which revealed trends that provide strong evidence on the existence of a dominant and quantifiable trend of AE activity which was noted to be directly associated with crack initiation. The onset of cracking in both types of aluminum specimen tested was noted with an increase in the peak frequency and partial powers which was used to define a novel AE damage parameter and shown to robustly identify crack initiation in both tensile and fatigue loading.
Starting Page	837
Ending Page	850
Page Count	14
File Format	PDF
ISSN	00144851
Journal	Experimental Mechanics
Volume Number	55
Issue Number	5
e-ISSN	17412765
Language	English
Publisher	Springer US
Publisher Date	2015-01-21
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fatigue crack Acoustic emission Infrared thermography Digital image correlation Aluminum alloys Damage parameter Continuum Mechanics and Mechanics of Materials Characterization and Evaluation of Materials Optics, Optoelectronics, Plasmonics and Optical Devices Structural Mechanics Vibration, Dynamical Systems, Control Mechanics
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Mechanical Engineering Aerospace Engineering

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