Abstract
This paper presents a study to understand the physical nature of fatigue crack growth as an acoustic emission source and detectability of the crack length form the recorded acoustic emission signal in plate structures. For most of the thin walled engineering structures, the acoustic emission detection through sensor network has been well established. However, the majority of the research is focused on prediction of the acoustic emission due to fatigue crack growth using stochastic methods. Where, stochastic models are used to predict the criticality of the damage. The scope of this research is to use predictive simulation method for acoustic emission signals and extract the damage related information from acoustic emission signals based on physics of material. This approach is in contrast with the traditional approach involving statistics of acoustic emissions and their relation with damage criticality. In this article, first, we present our approach to understand fatigue crack growth as source of acoustic emission using physics of guided wave propagation in FEM. Then, using this physical understanding, we present our investigation on detectability of crack lengths directly from crack-generated acoustic emission signals. Finally, we present our method to extract fatigue crack length information from acoustic emission signals recorded during fatigue crack growth.
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Supports from the Office of Naval Research #N000141110271, N000141410655, Dr. Ignacio Perez (Program Officer) is thankfully acknowledged.
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Poddar, B., Giurgiutiu, V. Detectability of Crack Lengths from Acoustic Emissions Using Physics of Wave Propagation in Plate Structures. J Nondestruct Eval 36, 41 (2017). https://doi.org/10.1007/s10921-017-0392-x
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DOI: https://doi.org/10.1007/s10921-017-0392-x