Journal article
Identification of Crack Initiation in Aluminum Alloys using Acoustic Emission
Experimental mechanics, v 55(5), pp 837-850
01 Jun 2015
Featured in Collection : UN Sustainable Development Goals @ Drexel
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.
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Details
- Title
- Identification of Crack Initiation in Aluminum Alloys using Acoustic Emission
- Creators
- P. A. Vanniamparambil - Drexel UniversityU. Guclu - Drexel UniversityA. Kontsos - Drexel University
- Publication Details
- Experimental mechanics, v 55(5), pp 837-850
- Publisher
- Springer Nature
- Number of pages
- 14
- Grant note
- N00014-13-1-0143 / Office of Naval Research
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Mechanical Engineering and Mechanics
- Web of Science ID
- WOS:000354208000004
- Scopus ID
- 2-s2.0-84939977198
- Other Identifier
- 991019168643604721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Materials Science, Characterization & Testing
- Materials Science, Multidisciplinary
- Mechanics