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Title: Non-Destructive Inspection of Blades.


Abstract not provided.

; ; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the UVIG O&M User Group Meeting Spring 2015 held March 18-19, 2015 in Minneapolis, MN.
Country of Publication:
United States

Citation Formats

Paquette, Joshua, Rice, Thomas M., Neidigk, Stephen, Roach, Dennis P., and Duvall, Randy L. Non-Destructive Inspection of Blades.. United States: N. p., 2015. Web.
Paquette, Joshua, Rice, Thomas M., Neidigk, Stephen, Roach, Dennis P., & Duvall, Randy L. Non-Destructive Inspection of Blades.. United States.
Paquette, Joshua, Rice, Thomas M., Neidigk, Stephen, Roach, Dennis P., and Duvall, Randy L. 2015. "Non-Destructive Inspection of Blades.". United States. doi:.
title = {Non-Destructive Inspection of Blades.},
author = {Paquette, Joshua and Rice, Thomas M. and Neidigk, Stephen and Roach, Dennis P. and Duvall, Randy L},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2015,
month = 3

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  • The use of a digital infrared as a non-destructive evaluation thermography camera (NDE) tool was ex- plored in two separate wind turbine blade fatigue tests. The fwst test was a fatigue test of part of a 13.1 meter wood-epoxy-composite blade. The second test was on a 4.25 meter pultruded fiber glass blade section driven at several mechanical resonant frequencies. The digital infrared camera can produce images of either the static temperature distribution on the surface of the specimen, or the dynamic temperature distribution that is in phase with a specific frequency on a vibrating specimen. The dynamic temperature distribution (duemore » to thermoplastic effects) gives a measure of the sum of the principal stresses at each point on the surface. In the wood- epoxy-composite blade fatigue test, the point of ultimate failure was detected long before failure occurred. The mode shapes obtained with the digital infrared camera, from the resonant blade tests, were in very good agree- ment with the finite-element calculations. In addition, the static temperature images of the resonating blade showed two areas that contained cracks. Close-up dy- namic inf%red images of these areas showed the crack structure that agreed with subsequent dye-penetrant analysis.« less
  • Loss in utility plant availability created by failure-causing stress corrosion cracks in steam turbine blades makes early detection of this problem critical. Visual examination and magnetic particle testing are the nondestructive examination (NDE) methods usually utilized during field inspection of blades; however, there are reported instances where stress corrosion cracks were missed. A consequence of missed cracks could be blade failure during operation, leading to costly, unscheduled plant outage. To alleviate this problem, the utility industry is currently funding a study which includes a survey of the industry to define and assess limitations of the current NDE practices for turbinemore » blades, an evaluation of NDE methods using flawed blade samples, conducting field tests, and development of standardized methods and procedures. Preliminary results of the first year of the study are presented.« less
  • Abstract not provided.
  • Abstract not provided.
  • Loss of utility plant availability as a result of failure-causing cracks in steam turbine blades makes early detection of this problem critical. An Electric Power Research Institute survey, conducted as part of project RP 1266-24, indicated that 72% of turbine blade failures in fossil power plants occur in low-pressure (LP) turbines with half of all blade failures occurring in the last two blade stages (L-0 and L-1 rows). Failures are generally associated with blade tailing edges and root areas. Project RP 1266-24 also found that 79% of the blade problems in LP turbines were cracks. A turbine design of particularmore » concern has been the Westinghouse Building Block (B.B.) 73. Reinhart and Associates has successfully inspected seven in-place B.B. 73 units for six utilities during the past 3 yr, as well as several disassembled turbines of other manufacturers and designs. These examinations consisted of visual and eddy-current examinations of the blade roots and trailing edges. The in-place inspections were performed using prototype manipulation devices to gain access to the blades through the hand holes. The only disassembly required to gain access for the examinations was the removal of the man-way covers on the main shell and the hand-hole covers on the outer cylinder covering the L-0 and L-1 blade rows.« less