Damage Tolerance Assessment Handbook VOl 1: Introduction Fracture Mechanics, Fatigue Crack Propagation
File : pdf, 5 MB, 164 pages
TOC
1. INTRODUCTION
1.1 Historical Perspective
1.2 Results of Air Force Survey
1.3 Comparison of Old and New Approaches
1.3.1 Fatigue Safe-Life Approach
1.3.2 Damage Tolerance Assessment (DTA) Approach
2. FRACTURE MECHANICS
2.1 Stress Concentration, Fracture and Griffith Theory
2.1.1 Fracture Modes
2.2 Extension of Linear Elastic Fracture Mechanics to Metals
2.2.1 Plastic Zone Size and the Mises-Hencky Yield Criterion
2.3 Fracture Toughness Testing
2.3.1 Thickness Effects
2.3.2 Temperature Effects
2.4 Failure in the Presence of Large-Scale Yielding
2.4.1 Resistance Curves
2.4.1.1 Graphical Construction of Thin-Section Strength Plots
2.4.2 The Net Section Failure Criterion
2.4.2.1 Failure Mode Determination and the Feddersen Diagram
2.4.3 Crack Opening Displacement
2.4.4 J-Integral
2.4.5 Practical Developments
2.4.6 Strain Energy Density Criterion
2.4.7 Plastic Collapse Model
2.5 Internal, Surface, and Corner Cracks
2.6 Environmental Effects
4.6.1 Load Specification and Stress Analysis
4.6.1.1 Gust Load Factors (FAR 23.231 and FAR 25.341)
4.6.2 Residual Strength Evaluation
4.6.3 Crack Growth Life Evaluation
4.6.3.1 Modified Safe Life Based on Crack Growth
4.6.3.2 Damage Tolerance Evaluation Requiring Inspection
4.6.3.2.1 General Considerations for Nondestructive Inspection (NDI) Methodologies and Inspection Intervals
4.6.3.2.2 Time to First Inspection and Safe Inspection Interval
4.6.3.3 Safe Flight Time After Discrete Source Damage
4.6.3.4 Time to Loss of Fail-Safety
4.6.3.5 Verification of Crack Growth Life
4.6.3.5.1 Approximate Estimation of Spectrum Truncation Points
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