AAE552-Session3

AAE552-Session3 - AAE 552 Spring 2009 – A F Grandt 1 1...

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Unformatted text preview: 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 3 – 15 January 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 3 16 January 2009 Last Time: • Introduction to nondestructive inspection • Overview inspection methods • When to inspect Today: • Failure modes and inspection • Fatigue/NDE design criteria 4 Assignment Please read textbook : • Chapter 1 • Chapter 2 (section 2.6) • Chapter 4 5 Major Inspection Methods (the “Big 6”) • Visual inspection • Liquid penetrant • Radiography • Ultrasonic • Eddy current • Magnetic particles 6 Chapter 1: Introduction Goals: • Set context for elements of structural integrity • Initial Damage • Damage tolerance • Nondestructive inspection • Overview failure modes • Overview NDE • Fatigue design criteria AAE 552 Spring 2009 – A. F. Grandt 2 7 wear out failure from latent defects steady state time Failure Rate “Bathtub” Failure Rate Curve Figure 1.3 8 Manufacturing (Initial) Damage Material defects • Inclusions, porosity • Constituent particles • Forging/casting defects • Thermal/mechanical treatment Machining defects • Nicks & dings, residual stresses • Rough surfaces, over heating, . . . Assembly Errors • Missing/damaged components • Nicks & dings • Force fits, residual stresses, assembly cracking • Poor welding, fastener installation 9 Mordfin’s Axioms • All materials contain flaws • Flaws do not necessarily render component unfit for service • Detectability generally increases with flaw size Reference: Bray & Stanley, p 3 “How did inspector number 11 ever let that one get past him?” 11 January 2009 Lafayette Journal & Courier Acceptance Criteria What renders component unsuitable? • Appearance? • Improper function? • Reliability? • Safety • Structural integrity • Injury/loss of life 11 12 Inspection Goal • Must have acceptance criteria • Need failure criteria • Desired component life • Must relate detectable features to accept/reject • Must determine when to inspect Determine if component suitable for service – does it perform intended function? AAE 552 Spring 2009 – A. F. Grandt 3 13 Cosmetic Damage Example Courtesy Joe McGilley (USCG) 14 • Would this scare you?! • Would you ground the aircraft?! Preflight Inspection of Helicopter Main Rotor Blade Shows This Courtesy Joe McGilley (USCG) 15 Cosmetic Crack!...
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This note was uploaded on 11/04/2010 for the course AAE 552 taught by Professor Longuski during the Spring '10 term at IUPUI.

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AAE552-Session3 - AAE 552 Spring 2009 – A F Grandt 1 1...

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