crack determination
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Crack determination
Made by Voronova O.Y.Scientific supervisor – Volchuc V.N.
Language supervisor – Kuznecova E.S.
![Page 2: Crack determination](https://reader035.vdocuments.us/reader035/viewer/2022070503/56816266550346895dd2d12c/html5/thumbnails/2.jpg)
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).
![Page 3: Crack determination](https://reader035.vdocuments.us/reader035/viewer/2022070503/56816266550346895dd2d12c/html5/thumbnails/3.jpg)
FractureDuctile fracture Brittle fracture
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General Information
-Experimental determination
of crack
-structural features
-specimen “compact” model
-stress intensity
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Fragility is not a property
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The influence of structural features
O brittle fractures;O larger grains of ferrite;O distribution of cementite (Fe3C);O impurities effect.
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The effect of additives
-oxygen,nitrogen,phosphoru
s,sulfur,silicon
-vanadium,cobalt ,chromium
-manganese,copper,nickel
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Standard sample
Parameter of fracture toughness -is a property of material characterizes its viscosity or ability to slow down the destruction
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Stress intensity
- 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).
(29.6(-185.5(+655.7(-1017()
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Thank you for your attention!