Metya, Avijit and Parida, N and Bhattacharya, D K and Bandyopadhyay, N R and Sagar, S Palit (2007) Assessment of Localized Plastic Deformation during Fatigue in Polycrystalline Copper by Nonlinear Ultrasonic. Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 38A (12). pp. 3087-3092. ISSN 1073-5623

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Abstract

Nonlinear ultrasonic (NLU) and conventional ultrasonic techniques have been applied to assess the localized plastic deformation in polycrystalline copper during high-cycle fatigue (HCF). The measurement parameter of NLU, i.e., the NLU parameter, b, has been calculated from the power spectrum of the filtered and amplified received signal. For conventional ultrasonic, longitudinal velocity (Vl) and attenuation coefficients (a) have been determined. It has been observed that the position of maximum localized plastic deformation cannot be detected by Vl and a, whereas b detects the same at the stage of 30 pct of damage corresponding to the total fatigue life of the material. The result of NLU has also been correlated with the hardness during fatigue. This work reveals the potential of NLU to assess the localized deformation during fatigue much earlier to the failure.

Item Type:	Article
Subjects:	Physical Properties
Divisions:	UNSPECIFIED
Depositing User:	Namita Dutta
Date Deposited:	24 Jan 2012 10:11
Last Modified:	26 May 2016 04:45
URI:	http://cgcri.csircentral.net/id/eprint/368

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