Crack Propagation; Fatigue; Crack Nucleation and Propagation; Number of Cycles to Failure Linear-Elastic Fracture Mechanics Method 0:00 Original Fatigue Definition 1:07 Crack Nucleation 1:23 Propagation Stages 3:09 Crack Propagation Bases 4:45 Paris Equation 5:45 Crack Propagation Example Previous Video: Fracture Toughness and Crack Modes in Under 10 Minutes https://www.youtube.com/watch?v=3CPRRov7DRk Example 1: https://www.youtube.com/watch?v=ocZge17En4Y Next Video: Fatigue (Strength-Number of Cycles) SN-Diagrams in Under 10 Minutes https://www.youtube.com/watch?v=bKisZhBzQsU _____________________________________________ Other "Mechanical Engineering Design 1" Links: 1. Axial Loading Review https://www.youtube.com/watch?v=d-ZriY-TWKI 2. Torsion Review https://www.youtube.com/watch?v=Nem1IabOLsk 3. Pure Bending and Deflection Review https://www.youtube.com/watch?v=KgpxCEKHKmY 4. Pure Bending and Deflection Combined Example https://www.youtube.com/watch?v=SS0lXhKz1M0 5. Shear and First Moment About Neutral Axis Review https://www.youtube.com/watch?v=ynSo2bXbIX0 6. Mohr's Circle Review https://www.youtube.com/watch?v=Xc3VzDy5Ik4 7. Brittle Failure Theories - Fracture Criteria https://www.youtube.com/watch?v=D7aoVr7qzGc 8. Ductile Failure Theories - Yield Criteria https://www.youtube.com/watch?v=YlRwO56r2UU 9. Design Factor and Uncertainty vs. Factor of Safety https://www.youtube.com/watch?v=HZZWWpF45pw 10. Tolerance Stack Ups and Tolerance Loops https://www.youtube.com/watch?v=_pHt_g0oLYs 11. Castigliano's Theorem https://www.youtube.com/watch?v=oJU94i-O19U 12. Fracture Toughness https://www.youtube.com/watch?v=3CPRRov7DRk 13. Crack Propagation https://www.youtube.com/watch?v=wLm_IjFcltA 14. Fatigue SN Diagrams https://www.youtube.com/watch?v=bKisZhBzQsU 15. Marin Factors and Corrected Endurance Limit https://www.youtube.com/watch?v=kZwl9Jysk64 16. Fatigue Stress Concentration and Notch Sensitivity Factors https://www.youtube.com/watch?v=nCEn924X2aI 17. Fatigue Failure Criteria https://www.youtube.com/watch?v=mAJsN1_IY2U 18. Shaft Design and Iterative Process https://www.youtube.com/watch?v=Fp5-jjmaksM 19. Power Screws – Torque to Force Relationship https://www.youtube.com/watch?v=BstZUC4tcOA 20. Screw Thread Stress https://www.youtube.com/watch?v=46lcuQYQ14g 21. Fastener and Member Stiffness https://www.youtube.com/watch?v=CDmvSRMwCyQ 22. Bolt Tension https://www.youtube.com/watch?v=NsJ0uS7sZxo 23. Proof Strength and Factors of Safety https://www.youtube.com/watch?v=j6B433Xdtb0 24. Spring Stress and Spring Constant https://www.youtube.com/watch?v=5Vv1NBvpG4Y 25. Shearing Yield Strength and Presetting https://www.youtube.com/watch?v=iGED8XYE3PI 26. Springs Fatigue – Zimmerli Data https://www.youtube.com/watch?v=Y29Q-Q91xlk 27. Spring Design Restrictions https://www.youtube.com/watch?v=dsWQrzfQt3s 28. Extension Springs https://www.youtube.com/watch?v=wKzU2s9bEA8 29. Gear Relations and Nomenclature https://www.youtube.com/watch?v=NF8fpuczU5I 30. Gear Trains and Planetary Gears – Mechanical Advantage https://www.youtube.com/watch?v=zE4HGKRufU0 31. Spur Gear Forces and Force Components https://www.youtube.com/watch?v=UieUEBnO5ps 32. Helical and Bevel Gear Forces https://www.youtube.com/watch?v=921ToiOynMA 33. Worm Gear Forces https://www.youtube.com/watch?v=7cNR4YJ1cnI 34. Bending Stress at the Teeth – Lewis Form Factor https://www.youtube.com/watch?v=J1i29j43trM 35. Pitting - Surface Compressive Stress https://www.youtube.com/watch?v=g2q-S6SJ9n4 36. Bearing Radial Loads https://www.youtube.com/watch?v=aU4CVZo3wgk 37. Bearing Reliability https://www.youtube.com/watch?v=HxnOMUx7w3o 38. Bearing Axial Loads and Equivalent Combined Loads https://www.youtube.com/watch?v=3b8yOMSWXXk