COURSE OUTLINE
FATIGUE, FRACTURE MECHANICS & DAMAGE
TOLERANCE
A. 150 YEARS OF FATIGUE MISHAPS & Counting!
1 hour
Structural Failure Modes: Creep, Fatigue, Corrosion, Wear, Fretting.
Why"High-Strength" Materials Are weak In Fatigue
B. CRACK INITIATION AND PROPAGATION: DESIGN STRATEGIES
TO COMBAT FATIGUE 2 hours
What is a FAILURE? USAF-Navy-FAA-NASA Guidelines, Case Study: Cracking
In F-16
Fighters: US Navy & USAF Safety Factor Fantasies -- The Chippewa
Effect, Infant
Mortality. F-111 Crash: Dawn of FAIL-SAFE Policy Crack Arrest and
Multiple Load
Paths Case Study: Sioux City 1989 DC-10 Crash
C. FRACTOGRAPHY 1 hour
Beach Marks, Striations, Demo of Parts Failed by Fatigue
D. CRACK INITIATION PROBLEMS 2 hours
S-N CURVES, Endurance Limit and Fatigue Strength Surface & Size
effects, STRESS CONCENTRATION Data, Load Streamlines Analogy, Classroom
Exercises in Crack
Initiation
E. MEAN STRESS EFFECTS 1 hour
GOODMAN & HAIGH Diagrams, Design Charts, Problems
F. LOW-CYCLE FATIGUE 2 hours
Neuber Notch Strain Analysis, Example Problems Data For Aerospace
Materials
G. MINER'S MYTH 1 hour
Limited Applicability of Cumulative Damage, Dangers in Over-Reliance,
Other Methods, Sample Data
H. FRACTURE MECHANICS 5 hours
DA Vinci & Griffith Experiments
The Stress Intensity Factor
Fracture Toughness -- Thickness & Directionality Effects
Residual Strength Paris, Forman, & Walker Equations
Example Crack Growth Calculations
The Principle of Superposition, Compounding, Beta Factors
Exercises using Stress Intensity Factor Handbook
The Surface Crack
Cracked Lugs, Stiffeners
Variable Amplitude Loading; Retardation
Willenborg, Wheeler, and Closure Models
Dynamic Fracture; Adhesives
Multiaxial Loadings -- Mixed Mode Crack Problems
I. CRACKING AT STRUCTURAL HOLES 2 hours
Loaded Holes Solution Methods
Stop-Drill Technical Data
Demo: StopCrack, ForceMate, & Coldworking of Holes
J. DAMAGE TOLERANCE 2 hours
Slow Crack Growth Structure
Multiple Load Path Structure
Continuing Damage & Multi-Site Damage
FAA FAR 25.571 and 1529
USAF MIL-A-83444 & MIL-A-87221A
Demo: Fatigue-Fuse & Krak-Gage
ASIP - Aircraft Structural Integrity Pgm.
Individual Aircraft Tracking -- IATP
K. COMPOSITES 2 hours L. BEARINGS, SHAFTS,
SPRINGS, RIVETS 1 hour M. NDE 1 hour
Important Inspection Methods -- Applicability, Reliability, Probability
of Detection, Ultra Imaging, MagRubber, Eddy Scan
N. PRESSURE VESSELS 1 hour
ASME Boiler Code, Leak Before Break, Cases: Comet, Aloha Convertible-in-the-sky!
O. LOAD SPECTRUM DEVELOPMENT 1 hour
Sequence Effects, Truncation, Clipping, Retardation
P.
CRACK GROWTH Example Calculations 1 hour Q. AGING
AIRCRAFT ISSUES 1 hour
FAA, Airlines, Navy, USAF Guidelines, Retrofits
R. SHORT
CRACKS 1 hour S. CORROSION FATIGUE 2 hours
Case Study: A Landing Gear Failure
T. FRETTING FATIGUE
1 hour
Case Study: A Helicopter Lug Failure
U. STRESS CORROSION CRACKING 2 hours
Case Study: SCC of an Improperly Repaired Aircraft Structure
V.
WELDS-BREEDING GROUND FOR CRACKS 2 hours
Porosity, Residual Stress, Reinforcement, Beta Factors, Hot Cracking,
S-N & da/dN Data
W. HELPFUL TREATMENTS & PROCESSES
1 hour
Examples of Bad Design & Improvements, Residual Stress, Demo:
Rollscan, Stresscan, Barkhausen Noise, SHOT-PEENING Advantages & Limitations,
SHOT PEENING Manual
X. CRACKED PARTS REPAIR PROCEDURES 1 hour
Videos On Boron/Epoxy Repair, Case Study -- Boeing 747 Japan Airlines
Crash, 1985
Y. FATIGUE, CRACK GROWTH & DTA TESTS 1
hour
Specimen, Coupon, Component, & Full-Scale Tests ASTM Test Methods
E399 & E647, Test Machines
Z. OPTIONALS (enter # in your Registration Form)
Bearings --- Pitting &Spalling Fatigue
Sonic Fatigue
Creep & Thermal Fatigue, Radiation
Weibull Parameters for Reliability
Fatigue in Helicopters
Fatigue of Polymers
|