Progress on ultrasonic flaw sizing in turbine-engine rotor components: bore and web geometries

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5706506

Rose, J H; Gray, T A; Thompson, R B; Opsal, J L

The application of generic flaw-sizing techniques to specific components generally involves difficulties associated with geometrical complexity and simplifications arising from a knowledge of the expected flaw distribution. This paper is concerned with the case of ultrasonic flaw sizing in turbine-engine rotor components. The sizing of flat penny-shaped cracks in the web geometry discussed and new crack-sizing algorithms based on the Born and Kirchhoff approximations are introduced. Additionally, we propose a simple method for finding the size of a flat, penny-shaped crack given only the magnitude of the scattering amplitude. The bore geometry is discussed with primary emphasis on the cylindrical focusing of the incident beam. Important questions which are addressed include the effects of diffraction and the position of the flaw with respect to the focal line. The appropriate deconvolution procedures to account for these effects are introduced. Generic features of the theory are compared with experiment. Finally, the effects of focused transducers on the Born inversion algorithm are discussed.

• Research Organization: Ames Lab., IA (USA); Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5706506
• Report Number(s): IS-M-445; CONF-830811-9; ON: DE83018081
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420500* -- Engineering-- Materials Testing
ACOUSTIC TESTING
ALGORITHMS
COHERENT SCATTERING
CRACKS
DEFECTS
DIFFRACTION
FOCUSING
MACHINERY
MATERIALS TESTING
MATHEMATICAL LOGIC
NONDESTRUCTIVE TESTING
REFRACTION
ROTORS
SCATTERING
SIZE
SOUND WAVES
TESTING
TRANSDUCERS
TURBINES
TURBOMACHINERY
ULTRASONIC TESTING
ULTRASONIC WAVES