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- W156733200 abstract "Acoustic emission (AE) has been evaluated as a technique for detecting the growth of short cracks. The purpose of this work was to assess the feasibility of detecting intergranular stress-corrosion cracking (IGSCC) initiation with acoustic emission and to evaluate the minimum crack length detectable with AE. Acoustic emission offers potential advantages over other techniques for detecting crack initiation and the early stages of crack growth: dynamic real-time measurements and remote monitoring are possible, the technique is passive and nonintrusive, it is not necessary to know the crack location, the crack can be located by detector arrays, and the technique is interfaceable with automatic data acquisition equipment and is suitable for long-term monitoring. It was demonstrated in this program that AE was capable of detecting early stages of crack growth in Type 304 SS. Intergranular stress corrosion cracks of 200 to 300 {mu}m in length and 100 to 200 {mu}m in depth were detectable with AE. The results were similar for material with a high and low degree of sensitization in both Na{sub 2}S{sub 2}O{sub 3} and NaCl environments. The results of this research program demonstrate the usefulness of AE in detecting early stages of crack growth. Further evaluation of this more » technique is recommended with evaluation of transgranular crack initiation and intergranular stress corrosion crack initiation in other materials such as Inconel 600 (IN 600), welded samples of Type 304 SS and scaleup to pipe studies. There is also evidence that the AE technique has not been fully optimized and that improvements in signal-to-noise ratios and signal amplification are possible. « less" @default.
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- W156733200 date "1990-05-01" @default.
- W156733200 modified "2023-09-27" @default.
- W156733200 title "Acoustic emission for detecting crack initiation in stainless steel" @default.
- W156733200 hasPublicationYear "1990" @default.
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