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RESEARCH PAPERS

Phased Array Ultrasonic Measurement of Fatigue Crack Growth Profiles in Stainless Steel Pipes

[+] Author and Article Information
L. Satyarnarayan, C. V. Krishnamurthy

Center for Nondestructive Evaluation, Indian Institute of Technology Madras, Chennai 600 036, India; Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, India

D. M. Pukazhendhi, D. S. Ramachandra Murthy

 Fatigue Testing Laboratory, Structural Engineering Research Centre, Taramani, Chennai 600 113, India

Krishnan Balasubramaniam

Center for Nondestructive Evaluation, Indian Institute of Technology Madras, Chennai 600 036, India; Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, Indiabalas@iitm.ac.in

J. Pressure Vessel Technol 129(4), 737-743 (Jul 24, 2006) (7 pages) doi:10.1115/1.2767367 History: Received May 07, 2006; Revised July 24, 2006

This paper reports experimental sizing of fatigue crack profiles that are initiated from artificially made circumferential starter notches in stainless steel pipes of 169mm outer diameter and 14.33mm thickness, which were subjected to cyclic bending loads in a four point bending load arrangement using two nondestractive evaluation (NDE) methods: (a) phased array ultrasonic technique and (b) alternating current potential drop technique. The crack growth estimated using the two NDE techniques were compared with the beach marks that were present in the fracture surface. A simulation study using the ray tracing method was carried out to model the ultrasonic wave propagation in the test specimen, and the results were compared with the experimental results.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Beam steering and focusing in a phased array transducer

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Figure 2

(a) Line sketch of the pipe. (b) View of the SS pipe with surface notch in the circumferential direction.

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Figure 3

(a) Line sketch of the four point bending setup. (b) View of four point bending setup.

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Figure 4

(a) Ultrasound path between crack tip and corner trap signal for a surface crack. (b) Crack height measurement using A scan read from volume-corrected B scan.

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Figure 5

View of the fractured surface showing the beach marks

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Figure 6

(a) Crack profile development curves pipe 1. (b) Crack profile development curves pipe 2.

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Figure 7

Comparison of the size of the crack at the notch center with increasing load cycles obtained using the two techniques with beach mark data

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Figure 8

(a) Comparison of simulated and experimental B and A scans of 7.5mm crack in a 14.33mm thick pipe. (b) Comparison of simulated and experimental B and A scans of 9.8mm crack in a 14.33mm thick pipe.

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