Fractography

Experimental-Fractography

• Description
  • Explanation of what fractography is and how it is useful.
• Modes of Fracture and Related Terms
  • Micorvoid Coalescence or Dimple Rupture
    • dimples, ripples, stretched area, serpentine glide, intergranular dimple rupture
  • Transgranular Cleavage
    • cleavage, cleavage step, feather marking, herringbone structure, tongues, microtwins, Wallner lines, quasi-cleavage
  • Fatigue
    • beachmarks/clamshells, ductile and brittle striations, ratchet marks, secondary cracks, tire tracks
  • Decohesive Rupture
    • stress-corrosion cracking, hydrogen embrittlement, rubbing or attrition marks, mud cracking, geometric patterns, glide plane decohesion
• Material Tests
  • tension test, torsion, transverse rupture, notch bend, Charpy impact, high cycle-bending, low cycle-bending, high cycle-axial, low-cycle-axial, stress rupture, rotating beam fatigue, reverse bending fatigue, rolling contact fatigue
• Failure pictures will be shown of each test with various materials
  • Metals: Steels (various hardnesses)[Bhattacharyya, 1-3, 1-227, 1-290, 1-427] [Strauss, 136, 138], Aluminum Alloys[Bhattacharyya, 2-4, 2-10, 2-15], various alloys (Ti, Nitralloys, Ni-base)[Bhattacharyya , 1-213, 3-36, 3-37, 4-19]
  • Ceramics: Alumina [Varner, 162], HPZ [Varner, 179], SiC [Varner, 285, 301]
  • Polymers: Sulfur Vulcanized Polybutadiene Rubber [Bhomick, 132], Chlorosulfonated Polyethylene [Bhomick, 133], PE [Bhomick, 78], Styrene Butadiene Rubber [Bhomick,111]
  • Composites: gamma-Al2O3 [Masters/Gilbertson, 151, 156, 158], ARALL [Masters/Gilbertson, 172, 181, 182], SiC/LAS Ceramic [Varner, 267]
• Quantitative
  • Definition and Applications
    • Experimental Techniques
    • Quantitative Descriptors
    • Application
      • Material Toughness
      • Aircraft Components

  Visualization

  • Many scanned images

  HTML

  • links to other areas of project: Experimental-Behavior-Brittle and Ductile, Experimental-Test Methods (if applicable movies of tests)
  
  Items will be altered, removed, or added due to lack, abundance or relevance of resources.
  
  Signed,
  
  Ron Halahan
  

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  Maintained by Ronald Halahan
  Last Update: March 15,1997
  http://www.vt.edu:10021/R/rhalahan/contract.htm