Journals Information
Universal Journal of Materials Science Vol. 3(4), pp. 62 - 69
DOI: 10.13189/ujms.2015.030402
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Calibration of Acoustic Emission System for Materials Characterization
S. V. Ranganayakulu 1, B. Samrat Goud 1, P V Sastry 2,*, B. Ramesh Kumar 3
1 Centre for Non Destructive Evaluation, Guru Nanak Institutions Technical Campus, India
2 R&D Division, Bharat Heavy Electricals Limited, India
3 Prototype VV &Pellet Injector Division, Institute for Plasma Research, India
ABSTRACT
Acoustic Emission (AE) is one of the versatile tools to study the materials and associated defects non-destructively under dynamic or static stress load conditions. The experiments planned to study Acoustic Emission system have to be calibrated with various resonant frequency band sensors and stress levels appropriately. This practice covers requirements for the calibration of acoustic emission sensors. The calibration yields the frequency response of a sensor to acoustic waves of the type which normally comes upon in acoustic emission work. The source producing the signal is used for the calibration that increases on the same surface of the test block as the sensor under testing. The calibration represents primarily of the sensor sensitivity to Rayleigh waves. The sensitivity of the sensor is determined for excitation within the range of 1000 KHz to 1KHz. The sensitivity value is usually determined at frequency approximately 1 KHz apart. The AE sources are generally from high intensity stress zones, cracks or defects in the materials under mechanical loads. The acoustic sound signals generated in the dynamic load conditions like burst or continuous emissions must be correlated with parameters such as velocity, time and displacement within the testing system. AE - 4 Channel Acoustic Emission Detection System (procured from Physical Acoustic Corporation, USA) with various frequency band sensors covering wide range is used in this study for the calibration procedure establishment. AE sensors are arranged in vector and matrix mode for signal analysis through AE parameters. In order to deduce physical description of AE sources from recorded waveforms, a well characterized and calibrated AE sensor is required for study of signal analysis. The present paper reports the estimation of the physical quantity measured by the sensor i.e., velocity of material under test. Subsequently, AE source is used for sound signal to travel in the material such that velocity of the material is calculated by manual displacement and time mode. Calibration of sensors is evaluated by shear velocity and experimental standardization studied by the arrangement of different kinds of sensors namely - R6维, WS 维, PK15I and PK6I. The calibration procedure and standardization for testing of the materials is established and reported.
KEYWORDS
AE Parameters, Sensors, Calibration, Standardization
Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] S. V. Ranganayakulu , B. Samrat Goud , P V Sastry , B. Ramesh Kumar , "Calibration of Acoustic Emission System for Materials Characterization," Universal Journal of Materials Science, Vol. 3, No. 4, pp. 62 - 69, 2015. DOI: 10.13189/ujms.2015.030402.
(b). APA Format:
S. V. Ranganayakulu , B. Samrat Goud , P V Sastry , B. Ramesh Kumar (2015). Calibration of Acoustic Emission System for Materials Characterization. Universal Journal of Materials Science, 3(4), 62 - 69. DOI: 10.13189/ujms.2015.030402.