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Crack determination

Crack determination . Made by Voronova O.Y. Scientific supervisor – Volchuc V.N. Language supervisor – Kuznecova E.S. Crack . Can be defined as an extreme defect, being a region with completely broken atomic bonds (bank of cracks) and partly broken atomic bonds (crack tip). Fracture.

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Crack determination

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  1. Crack determination Made by Voronova O.Y. Scientific supervisor – Volchuc V.N. Language supervisor – Kuznecova E.S.

  2. Crack Can be defined as an extreme defect, being a region with completely broken atomic bonds (bank of cracks) and partly broken atomic bonds (crack tip).

  3. Fracture Brittle fracture Ductile fracture

  4. General Information -Experimental determination of crack -structural features -specimen “compact” model -stress intensity

  5. Fragility is not a property

  6. The influence of structural features • brittle fractures; • larger grains of ferrite; • distribution of cementite (Fe3C); • impurities effect.

  7. The effect of additives -oxygen,nitrogen,phosphorus, sulfur,silicon -vanadium,cobalt ,chromium -manganese,copper,nickel

  8. Standard sample Parameter of fracture toughness-is a property of material characterizes its viscosityor ability to slow down the destruction

  9. Stress intensity (29.6(-185.5(+655.7(-1017() - characteristic of fracture toughness in plane deformation (MPa× m1/2);B - specimen thickness (mm); W- width of specimen (mm); P -cycle loading;a - initial crack length (mm).

  10. Thank you for your attention!

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