AAE552-Session3

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

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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: aae552@ecn.purdue.edu 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 Mordfins 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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AAE552-Session3 - AAE 552 Spring 2009 A. F. Grandt 1 1 AAE...

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