Abstract
AbstractThis work provides structural integrity of SA 387 pressure vessel steel subjected to tensile loading using acoustic emission (AE) monitoring. AE signals were detected and investigated using specialized system developed by Physical Acoustics. To detect the elastic waves released by the material under stress and owing to dislocation motion, two sensors were mounted on the surface of the specimen. AE parameters such as amplitude, energy, hits, counts, rise time and average frequency are considered in this study. Variations of these AE parameters are investigated across different regions on tensile curve such as micro-plastic deformation, yield, strain-hardening, necking and fracture by analyzing the overall acoustic signals. The results of this study revealed that intense AE signals are detected in micro-plastic as well as fracture regions. AE cumulative energy (AECE) and AE cumulative count (AECC) curves have shown sharp increment in micro-plastic deformation and fracture regions, whereas in rest of regions remained stable. The AE source is located using time difference of arrival (TDOA) method. KeywordsAcoustic emissionAcoustic signal analysisTensile testingPressure vessel steel
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