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DTD Handbook

Handbook for Damage Tolerant Design

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    • Sections
      • 1. Introduction
      • 2. Fundamentals of Damage Tolerance
      • 3. Damage Size Characterizations
      • 4. Residual Strength
      • 5. Analysis Of Damage Growth
      • 6. Examples of Damage Tolerant Analyses
        • 0. Examples of Damage Tolerant Analyses
        • 1. Damage Tolerance Analysis Procedure
        • 2. Damage Development And Progression
          • 0. Damage Development And Progression
          • 1. Slow Crack Growth Structure
          • 2. Multiple Load Path, Fail Safe Structure
          • 3. Crack Arrest, Fail Safe Structure
        • 3. Slow Crack Growth Structure
        • 4. Multiple Load Path Structure
        • 5. Fail Safe Multiple Load Path Structure
      • 7. Damage Tolerance Testing
      • 8. Force Management and Sustainment Engineering
      • 9. Structural Repairs
      • 10. Guidelines for Damage Tolerance Design and Fracture Control Planning
      • 11. Summary of Stress Intensity Factor Information
    • Examples

Section 6.2.0. Damage Development And Progression

Fatigue-crack-growth prediction is complicated by the assumptions that have to be made for the progression of damage through the structure (continuing damage and remaining structure damage).  These damage assumptions are specified in JSSG-2006 Table XXX and will not be repeated here.  This section will discuss interpretation of these requirements through a series of three examples of increasing complexity.  The examples pertain to a Slow Crack Growth component, a Multiple Load Path Dependent, Fail Safe structure, and a Crack Arrest, Fail Safe structure, in this order.  They are illustrations of the analysis procedure.  No general rules can be given.