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Acoustic emission behaviour during stage II fatigue crack growth in an AISI type 316 austenitic stainless steel

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Abstract

Acoustic emission (AE) behaviour during fatigue crack growth (FCG) in a ductile AISI type 316 austenitic stainless steel is reported. The two substages in the stage II Paris regime of FCG could be distinguished by a change in the rate of acoustic activity with increase in crack growth rate. The transition point in the cumulative ringdown count plot coincides with that in the da/dn plot. The AE activity increases with increase in ΔK during stage IIa and decreases during stage IIb. The major source of AE during stage IIa is found to be the plastic deformation within the cyclic plastic zone (CPZ) as compared to the phenomena such as monotonic plastic zone (MPZ) expansion, ductile crack growth, crack closure, etc. The increase in AE activity with increase in ΔK during stage IIa is attributed to the increase in the size of the CPZ which is generated and developed only under plane strain conditions. The decrease in AE activity during stage IIb is attributed to the decrease in the size of the CPZ under plane stress condition. The high acoustic activity during the substage IIa is attributed to irreversible cyclic plasticity with extensive multiplication and rearrangement of dislocations taking place within the CPZ. The AE activity is found to strongly depend on the optimum combination of the volume of the CPZ, average plastic strain range and the number of cycles before each crack extension. Based on this, an empirical relationship between the cumulative RDC and ΔK has been proposed and is found to agree well with experimentally observed values.

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Authors and Affiliations

  1. Division for PIE and NDT Development, Indira Gandhi Centre for Atomic Research, 603 102, Kalpakkam, India

    V Moorthy, T Jayakumar & Baldev RAJ

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  1. V Moorthy
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  2. T Jayakumar
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  3. Baldev RAJ
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Moorthy, V., Jayakumar, T. & RAJ, B. Acoustic emission behaviour during stage II fatigue crack growth in an AISI type 316 austenitic stainless steel. Bull. Mater. Sci. 17, 699–715 (1994). https://doi.org/10.1007/BF02757552

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