Paper Titles
Microstructure and Microhardness in Current Annealed Fe65.5Cr4Mo4Ga4P12C5B5.5 Bulk Metallic Glass
p.521
Phase Composition and Magnetic Properties of Multiphase Melt-Spun Nd4.3Fe76.2B19.5 Alloy
p.527
Magnetoimpedance Effect in Fe89.8Ni1.5Si5.2B3C0.5 Metallic Glass Ribbons
p.533
The Effect of Temperature on the Magnetic Properties of the Electrochemically Obtained Ni92.8 Mo7.2 Powder Pressed at Different Pressures
p.539
Multilayer Composite Materials with Non-Usual Poisson's Ratios
p.545
The Role of Intermetallic Phases in Fatigue Crack Propagation Behavior of Al-Zn-Mg-Cu Alloys
p.553
The Effect of Thermo-Mechanical Processing on the Properties of some Al-Fe-Si Alloys with High Fe/Si Ratio
p.559
Numerical and Analytical Modelling of Elastic-Plastic Fracture Mechanics Parameters
p.565
Micromechanical Analysis of Constraint Effect on Fracture Initiation in Strength Mismatched Welded Joints
p.571

Micromechanical Analysis of Constraint Effect on Fracture Initiation in Strength Mismatched Welded Joints

Article Preview

Abstract:

In this paper the micromechanical approach to ductile fracture was applied in a study of constraint effect on crack growth initiation in mismatched welded joints. The single-edged notched bend specimens (precrack length a0/W=0.32) were experimentally and numerically analyzed. The coupled micromechanical model proposed by Gurson, Tvergaard and Needleman was used. Constraint effect was tested by varying widths of the welded joints (6, 12 and 18mm). Highstrength low-alloyed (HSLA) steel was used as the base metal in a quenched and tempered condition. The flux-cored arc-welding process in shielding gas was used. Two different fillers were selected to obtain over- and undermatched weld metal. The micromechanical parameters used in prediction of the crack growth initiation on precracked specimen were calibrated on a round smooth specimen. The difference in fracture behavior between over- and undermatched welded joints obtained in experimental results was followed by numerical computations of void volume fraction in front of the crack tip.

You might also be interested in these eBooks
Research Trends in Contemporary Materials Science View Preview

Info:

Periodical:

Materials Science Forum (Volume 555)

Pages:

571-576

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.555.571

Citation:

Cite this paper

Online since:

September 2007

Authors:

M. Dobrojević, Marko Rakin, Nenad Gubeljak, Ivana Cvijović, Misa Zrilić, N. Krunich, Aleksandar Sedmak

Keywords:

Constraint Effect, Ductile Fracture, High Strength Low-Alloyed Steel, Micromechanical Model, Mismatched Welded Joint

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2007 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] K-H. Schwalbe: Basic Engineering Methods of Fracture Mechanics and Fatigue (GKSSForschungszentrum, Geesthacht 2001).

Google Scholar

[2] M.C. Burstow and I.C. Howard: J. Mech. Phys. Solids Vol. 46 (1998), p.845.

Google Scholar

[3] N. Gubeljak, I. Scheider, M. Kocak, M. Oblak and J. Predan: 14 th European Conf. on Fracture, Cracow, Poland (2002), p.647.

Google Scholar

[4] I. Peneulas, C. Betegon and J.J. del Coz: 9 th European Mech. of Mater. Conf. - Local App. to Fracture, Moret-sur-Loing, France (2006), p.285.

Google Scholar

[5] A.L. Gurson: J. Engng. Materials and Technology Vol. 99 (1977), p.2.

Google Scholar

[6] V. Tvergaard: Int. J. Fracture Vol. 17 (1981), p.389.

Google Scholar

[7] V. Tvergaard and A. Needleman: Acta Metall. Vol. 32 (1984), p.157.

Google Scholar

[8] P.F. Thomason: Ductile Fracture of Metals (Pergamon Press, Oxford 1990).

Google Scholar

[9] J. Besson et al: Local Approach to Fracture (Les Presses de l'Ecole des Mines, Paris 2004).

Google Scholar

[10] Z.L. Zhang, C. Thalow and J. Odegard: Eng. Fract. Mechanics Vol. 67 (2000), p.155.

Google Scholar

[11] G. Bernauer and W. Brocks: Numerical Round Robin on Micro-Mechanical Models - Results (ESIS TC8 - GKSS Research Center, Geesthacht 2000).

Google Scholar

[12] M. Rakin, Z. Cvijovic, V. Grabulov, S. Putic and A. Sedmak: Eng. Fract. Mechanics Vol. 71 (2004), p.813.

DOI: 10.1016/s0013-7944(03)00013-4

Google Scholar

[13] M. Rakin, Z. Cvijovic, V. Grabulov, N. Gubeljak and A. Sedmak: Mater. Sci. Forum Vol. 453-454 (2004), p.175.

DOI: 10.4028/www.scientific.net/msf.453-454.175

Google Scholar

[14] M. Dobrojevic: Crack Growth Modeling in Welded Joints (University of Belgrade - Faculty of Mech. Eng; Ph.D. Thesis - in Serbian, Belgrade 2006).

Google Scholar