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AAE552-Session26 - AAE 552 Spring 2009 A F Grandt AAE 552...

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AAE 552 Spring 2009 – A. F. Grandt 1 1 AAE 552: Nondestructive Evaluation of Structures and Materials A. F. Grandt, Jr. Professor of Aeronautics and Astronautics Purdue University W. Lafayette, IN 47907 Session 26 – 13 March 2009 2 Contact Information Alten F. (Skip) Grandt, Jr. Email: [email protected] Telephone: Office: 765-494-5141 Home: 765-463-4276 FAX: 765-494-0307 Course webpage accessed at: http://www.itap.purdue.edu/tlt/blackboard 3 AAE 552 Session 26 13 March 2009 Last Time: Ultrasound generation/detection Parameter selection Instrumentation Today: Calibration Standards Data Presentations Applications Summary 4 Assignment Look over chapter 11 and 12 homework problems Exam #1 – Session 29 (Friday, 27 March 2009) Cover material thru ultrasonic inspection (Ch 12 in text) See topic list and sample exam on webpage 5 Midterm Exam - Session 29 25% of final grade Final exam – 30% (comprehensive) Paper 1 – 20% Paper 2 – 25% Closed book 1 page review sheet (both side of 8.5 x 11 inch sheet) Short answer, fill in blank, true/false, numerical calculations, etc. Chapters 1, 4, 10, 11, 12 Exam description and example exams on web page NDT Resource Center http://www.ndt-ed.org/ 6 This site was designed to be a comprehensive source of information and materials for NDT and NDE technical education. The site was created by NDT professionals and educators from around the world. (Thanks to Josh Haines)
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AAE 552 Spring 2009 – A. F. Grandt 2 7 Ultrasound Generation and Detection Piezoelectric transducers Electromagnetic-Acoustic Transducers (EMAT) Laser Generated Ultrasound Capacitive Transducers 8 Ultrasonic NDE Parameter Selection Consider component size, material, geometry Consider mode of sound wave Frequency selection Transducer selection Data presentation 9 Frequency Selection (Section 12.7) V = λ f = constant for material Compression wave speed > shear, surface waves f = frequency = V/ λ λλ Select high frequency ~ 1-10 MHz (small λ ) To increase sensitivity to small defects To increase resolution To decrease beam spread Select Low frequency ~ < 1 MHz (large λ ) To increase penetration For absorbing materials (decrease attenuation in polymers, concrete, wood, etc.) To decrease grain boundary scattering Instrumentation and Standards 10 11 Calibration Standards Calibration is a operation of configuring the ultrasonic test equipment to known values. This provides the inspector with a means of comparing test signals to known measurements. Calibration standards come in a wide variety of material types, and configurations due to the diversity of inspection applications. Calibration standards are typically manufactured from materials of the same acoustic properties as those of the test articles.
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