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A Method of Crack Detection in the Turbine Blade Using Digital Holographic Microscopy (DHM)

[+] Author Affiliations
Naoya Tada

Okayama University, Okayama, Japan

Seiichi Hamada, Tetsuo Teramae, Shin Yoshino, Takehiko Suzuki

Tokyo Electric Power Company, Tokyo, Japan

Paper No. PVP2011-57299, pp. 211-216; 6 pages
doi:10.1115/PVP2011-57299
From:
  • ASME 2011 Pressure Vessels and Piping Conference
  • Volume 5: High-Pressure Technology; Nondestructive Evaluation; Nuclear Engineering
  • Baltimore, Maryland, USA, July 17–21, 2011
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4455-7
  • Copyright © 2011 by ASME

abstract

The authors proposed an NDE method of detecting the crack developed in the turbine blade by means of digital holographic microscopy (DHM). UT procedures sometimes have limitations in particular cases of in-service-inspections such as the detection and sizing of a creep crack developed in the air-cooled casting blade of the combined cycle gas turbine. The local displacement at the blade surface near the crack during a mechanical loading is different from that of a non-cracked blade. This small different can be detected by DHM. The authors discussed whether this difference affected by the mechanical load between the cracked blade and the non-cracked is detectable by means of DHM or not. In this paper, the authors verified the practical validity of the proposed NDE method using the finite element analyses.

Copyright © 2011 by ASME

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