The determination of depth profile of vertical fatigue cracks generated in thick cruciform samples using an ultrasonic phased array is investigated in this paper. The cracks were formed by conducting fatigue fracture test on two mild steel cruciform specimens of 135 mm thickness: one under room temperature and the other under subzero temperature . A semi-elliptical surface starter notch of 2 mm width and more than 400 mm length was initially created in the specimens. Alternating current potential drop technique and phased array ultrasonic technique were attempted in order to determine the depth profiles of the starter notch as well as that of the crack. Virtual experiments carried out with a finite-difference time domain based numerical model were found to be advantageous in reducing actual experimental trials, facilitate an understanding of the echo signatures, and help assess the crack depth. The profiles of the crack and the notch were verified through destructive assay of the samples and subsequent dye penetrant assisted physical measurements.
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February 2010
Research Papers
Improved Imaging of Fatigue Crack Profile in Thick Cruciform Samples Using Ultrasonic Phased Array Models
S. Alavudeen,
S. Alavudeen
Department of Mechanical Engineering, Centre for Non Destructive Evaluation,
IIT Madras
, Chennai 600 036, India
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C. V. Krishnamurthy,
C. V. Krishnamurthy
Department of Mechanical Engineering, Centre for Non Destructive Evaluation,
IIT Madras
, Chennai 600 036, India
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Krishnan Balasubramaniam,
Krishnan Balasubramaniam
Department of Mechanical Engineering, Centre for Non Destructive Evaluation,
e-mail: balas@iitm.ac.in
IIT Madras
, Chennai 600 036, India
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D. M. Pugazhendhi,
D. M. Pugazhendhi
Fatigue Testing Laboratory,
Structural Engineering Research Centre
, Taramani, Chennai 600 113, India
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G. Raghava,
G. Raghava
Fatigue Testing Laboratory,
Structural Engineering Research Centre
, Taramani, Chennai 600 113, India
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P. Gandhi
P. Gandhi
Fatigue Testing Laboratory,
Structural Engineering Research Centre
, Taramani, Chennai 600 113, India
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S. Alavudeen
Department of Mechanical Engineering, Centre for Non Destructive Evaluation,
IIT Madras
, Chennai 600 036, India
C. V. Krishnamurthy
Department of Mechanical Engineering, Centre for Non Destructive Evaluation,
IIT Madras
, Chennai 600 036, India
Krishnan Balasubramaniam
Department of Mechanical Engineering, Centre for Non Destructive Evaluation,
IIT Madras
, Chennai 600 036, Indiae-mail: balas@iitm.ac.in
D. M. Pugazhendhi
Fatigue Testing Laboratory,
Structural Engineering Research Centre
, Taramani, Chennai 600 113, India
G. Raghava
Fatigue Testing Laboratory,
Structural Engineering Research Centre
, Taramani, Chennai 600 113, India
P. Gandhi
Fatigue Testing Laboratory,
Structural Engineering Research Centre
, Taramani, Chennai 600 113, IndiaJ. Pressure Vessel Technol. Feb 2010, 132(1): 011501 (8 pages)
Published Online: December 23, 2009
Article history
Received:
May 29, 2009
Revised:
September 10, 2009
Online:
December 23, 2009
Published:
December 23, 2009
Citation
Alavudeen, S., Krishnamurthy, C. V., Balasubramaniam, K., Pugazhendhi, D. M., Raghava, G., and Gandhi, P. (December 23, 2009). "Improved Imaging of Fatigue Crack Profile in Thick Cruciform Samples Using Ultrasonic Phased Array Models." ASME. J. Pressure Vessel Technol. February 2010; 132(1): 011501. https://doi.org/10.1115/1.4000375
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