Crack determination
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Crack determination Made by Voronova O.Y. Scientific supervisor – Volchuc V.N. Language supervisor – Kuznecova E.S.
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 Presentation
Transcript of 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).
FractureDuctile fracture Brittle fracture
General Information
-Experimental determination
of crack
-structural features
-specimen “compact” model
-stress intensity
Fragility is not a property
The influence of structural features
O brittle fractures;O larger grains of ferrite;O distribution of cementite (Fe3C);O impurities effect.
The effect of additives
-oxygen,nitrogen,phosphoru
s,sulfur,silicon
-vanadium,cobalt ,chromium
-manganese,copper,nickel
Standard sample
Parameter of fracture toughness -is a property of material characterizes its viscosity or ability to slow down the destruction
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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