Crack initiation analysis in structural steel by application of micromechanical approach.

• Autorzy: Rakin M. , Cvijovic Z. , Grabulov V. , Sedmak A.

Warianty tytułu

PL

Analiza inicjacji pęknięć w stalach konstrukcyjnych z zastosowaniem podejścia mikromechanicznego.

• Konferencja: XVIth Physical Metallurgy and Materials Science Conference on Advanced Materials and Technologies AMT'2001, Gdańsk-Jurata, 16-20 September 2001
• Języki publikacji: PL

Abstrakty

EN

Crack initiation in a structural steel, following void nucleation, growth and coalescence, has been analysed. The so-called coupled approach of micromechanical analysis of material damage has been applied. Such an approach is based on experimental testing of both precracked and non-precracked specimens, finite element (FE) calculations and metallurgical analysis. Numerical analyses of ductile-fracture initiation in ferritic steel were carried out through participation in the round robin project organised by European Structural Integrity Society (ESIS) [1]. Smooth round specimens and CT specimens were tested. Critical values of micromechanical damage parameters determined for smooth specimen were used to predict the onset of crack initiation in CT specimen and subsequently to model its stable growth. The analysis of the first phase of ductile fracture, void nucleation, was carried out by applying quantitative metallographic analysis of size and number of non-metallic inclusions. Based on this analysis, initial void volume fraction, used as input information in the large strain (updated Lagrangian) FE calculation, was determined. The results obtained suggest that the critical values of micromechanical parameters according to GTN model may be used for approximate prediction of ductile fracture initiation on CT specimen for tested steel.

Słowa kluczowe

PL

pęknięcie; stal konstrukcyjna; analiza mikromechaniczna; ciągliwy przełom; przełom plastyczny; stal ferrytyczna; model GTN

EN

crack; structural steel; micromechanical analysis; ductile fracture; ferritic steel; Gurson-Tvergaard-Needleman model; GTN model

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2001
• Tom: R. XXII, nr 5
• Strony: 741--744
• Opis fizyczny: Bibliogr. 14 poz. tab., rys.

Twórcy

autor

Rakin M.

• Faculty of Technology and Metallurgy, University of Belgrade, Yugoslavia

autor

Cvijovic Z.

• Faculty of Technology and Metallurgy, University of Belgrade, Yugoslavia

autor

Grabulov V.

• VTI, Belgrade, Yugoslavia

autor

Sedmak A.

• Faculty of Technology and Metallurgy, University of Belgrade, Yugoslavia

• University of Belgrade, Faculty of Technology and Metallurgy, Yugoslavia

Bibliografia

• [1] Bernauer G., Brocks W.: Numerical round robin on micro-mechanical models – Results, ESIS TC8, Institute for Materials Research – GKSS Research Center, Geesthacht, 2000.
• [2] Gurson A.L.: Continuum Theory of Ductile Rupture by Void Nucleation and Growth; Part I – Yield Criteria and Flow Rules for Porous Ductile Media, Journal of Engineering Materials and Technology 99, (1977), 2-15.
• [3] Tvergaard V.: Influence of Voids on Shear Band Instabilities under Plane Strain Conditions. International Journal of Fracture 17, (1981), 389-407.
• [4] Tvergaard V., Needleman A.: Analysis of Cupe-Cone Fracture in a Round Tensile Bar, Acta Metallurgica 32, (1984), 157-169.
• [5] Zhang Z. L.: A Sensitivity of Material Parameters for the Gurson Constitutive Model, Fatigue & Fracture of Engineering Materials and Structures 19, (1996), 561-570.
• [6] Zhang Z. L. Niemi E.: Studies on the Ductility Predictions by Different Local Failure Criteria, Engineering Fracture Mechanics 48, (1994), 529-540,
• [7] Sun D-Z., Kienzier R,, Voss B, Schmitt W.: Application of Micromechanical Models to the Prediction of Ductile Fracture, Fracture Mechanics – Twenty – Second Symposium, ASTM STP 1131 Vol. II, Atluri S.N., Newman J.C., Raju Jr.I., Epstein J.S. (Eds.), American Society for Testing and Materials, Philadelphia, 1992, 368-378.
• [8] Thomason P.F.: Ductile Fracture of Metals, Pergamon Press, Oxford, 1990.
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• [10] Beremin F. M.: Cavity Formation from Inclusions in Ductile Fracture of A508 Steel, Metallurgical Transactions 12A, (1981), 723-731.
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• [12] Chu C.C., Needleman A.; Void Nucieation Effects in Biaxially Stretched Sheets, Journal of Engineering and Materials Technology 102, (1980), 249-256.
• [13] Underwood E.E.: Quantitative Stereology, Adison-Welsey, Reading, Mass, 1970.
• [14] Rakin M.. Sedmak A., Matejic P., Zrilic M., Sedmak S.: Numerical Simulation of Ductile Fracture Initiation by application of Rice-Tracey Void Growth Model, Proc. ECF 13 ‘Fracture Mechanics: Applications and Challenges’, M. Fuentes et al. (Eds.), ESIS Publication, Elsevier Science Ltd, Oxford, 2000, printed on CD.