Fatigue (310)

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Chapter Outline

Chapter 9 - Fatigue (Mechanical Design for Product Reliability)

  • Fatigue-Crack-Growth Rate
  • How Materials Behave: The S-N Curve
  • Factors Influencing Fatigue Behavior
  • Stress Concentration
  • Photoelasticity
  • Fracture Mechanics
    • Fracture Toughness of Some Common Materials
    • Crack Propagation
    • Crack Growth Rate
    • Example of a Fracture Surface
    • Fracture Surfaces
  • Forensics
  • Failure Models
    • Failure Mechanism
    • Time-Dependent Failures
    • First Passage Model (Time to Failure)
  • The Goodman Diagram
  • The Constant Life Diagram
  • Exceeding a Critical Stress During Random Vibration
  • Inverse Power Law Model - Time to Failure
  • Fatigue Damage Model Based Upon S-N Curve - Number of Cycles to Failure
    • Idealized S-N Curve for Structural Materials
  • Fatigue Damage Model Based on Crack Growth Rate
  • Crack Growth Rate vs. Stress Intensity Factor
    • Stress Intensity Factors
  • Miner's Hypothesis for Fatigue Damage Accumulation
    • Miner's "Rule" Cautions
    • Determination of Effective Excitation
    • Fatigue, Miner’s Rule Example
  • Typical Endurance Limits
  • "S-N" Curve from Fatigue Testing
  • Fatigue Case Study
  • Example: Rating a Printed Circuit Board

Video Outline

Fatigue

Fatigue-Crack-Growth Rate • How Materials Behave: The S-N Curve • Factors Influencing Fatigue Behavior • Stress Concentration • Photoelasticity • Fracture Mechanics • Fracture Toughness: Some Common Materials • Crack Propagation • Crack Growth Rate • Fracture Surfaces • Forensics • Failure Models • Failure Mechanism • Time-Dependent Failures • First Passage Model (Time to Failure) • The Goodman Diagram • The Constant Life Diagram • Exceeding a Critical Stress During Random Vibration • Inverse Power Law Model - Time to Failure, Example • Fatigue Damage Model Based Upon S-N Curve - Number of Cycles to Failure • Idealized S-N Curve for Structural Materials • Fatigue Damage Model Based on Crack Growth Rate • Crack Growth Rate vs. Stress Intensity Factor • Stress Intensity Factors • Miner's Hypothesis for Fatigue Damage Accumulation • Miner's “Rule” Cautions • Determination of Effective Excitation • Fatigue, Miner’s Rule Example • Typical Endurance Limits • “S-N” Curve from Fatigue Testing • Fatigue Case Study • Example: Rating a Printed Circuit Board