Modeling of crack growth in ductile solids: a three-dimensional analysis

Kim, Jinkook; Gao, Xiaosheng; Srivatsan, T. S.

doi:10.1016/j.ijsolstr.2003.08.022

Cited by 90 publications

(73 citation statements)

References 28 publications

(27 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…calculations are performed with the voids explicitly modeled using a refined F.E. mesh (e.g., Aravas McMeeking 1985a, b;Tvergaard 1987, 1991;Hom and McMeeking 1989a, b;McMeeking 1992;Tvergaard and Needleman 1992;Ghosal and Narasimhan 1996;Yan and Mai 1997;Tvergaard and Hutchinson 2002;Kim et al 2003;Gao et al 2005;Petti and Dodds 2005a, b). These analyses accurately model the growth and coalescence process while properly accounting for the length scale introduced by the void spacing.…”

Section: The Second Strategymentioning

confidence: 99%

Modeling ductile to brittle fracture transition in steels—micromechanical and physical challenges

Pineau

2008

Int J Fract

View full text Add to dashboard Cite

Both scientists and engineers are very much concerned with the study of ductileto-brittle transition (DBT) in ferritic steels. For historical reasons the Charpy impact test remains widely used in the industry as a quality control tool to determine the DBT temperature. The transition between the two failure modes, i.e. brittle cleavage at low temperature and ductile fracture at the upper shelf occurs also at low loading rate in fracture toughness tests. Recent developments have been made in the understanding of the micromechanisms controlling either cleavage fracture in BCC metals or ductile rupture by cavity nucleation, growth and coalescence. Other developments have also been made in numerical tools such as the finite element (FE) method incorporating sophisticated constitutive equations and damage laws to simulate ductile crack growth (DCG) and cleavage fracture. Both types of development have thus largely contributed to modeling DBT occurring either in impact tests or in fracture toughness tests. This constitutes the basis of a modern methodology to investigate fracture, which is the so-called local approach to fracture. In this study the micromechanisms of brittle cleavage fracture and ductile rupture are firstly shortly reviewed. Then the transition between both modes of failure is investigated. It is shown that the DBT behavior observed in impact tests or in fracture toughness specimens can be reasonably well predicted using modern theories on brittle and ductile fracture in conjunction with FE numerical simulations. The review includes a detailed study of a number of metallurgical parameters contributing to the variation of the DBT temperature. Two main types of steels are considered : (i) quenched and tempered bainitic and martensitic steels used in the fabrication of pressurized water reactors, and (ii) modern high-toughness line-pipe steels obtained by chemical variations and optimized hot-rolling conditions. An attempt is also made to underline the research areas which remain to be explored for improving the strength-toughness compromise in the development of steels.

show abstract

Section: The Second Strategymentioning

confidence: 99%

Modeling ductile to brittle fracture transition in steels—micromechanical and physical challenges

Pineau

2008

Int J Fract

View full text Add to dashboard Cite

show abstract

“…Recently, several studies [12][13][14][15][16][17][18][19][20][21] have shown that the Lode angle, associated with the third invariant of the deviatoric stress tensor, is an essential parameter in ductile fracture. It characterizes the effect of the stress state on plastic flow and the ductile rupture of the material.…”

Section: Introductionmentioning

confidence: 99%

Experimental characterization and numerical modeling of micromechanical damage under different stress states

et al. 2013

View full text Add to dashboard Cite

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. The use of HSLA steels for the manufacture of automotive components is interesting from an engineering point of view. This family of steels, while possessing high strength, also has good formability and can be used in forming manufacturing processes. In some forming processes such as blanking, shear strain localization occurs, which causes damage and results in the final fracture of the material. This paper presents an experimental study based on in situ tests to understand and identify the physical mechanisms of ductile damage under two stress states: tension and shear. Different macroscopic tests were performed to calibrate a damage model based on a micromechanical approach. This damage model is based on the Gurson-Tvergaard-Needleman theory and presents recent improvements proposed by Nahshon and Hutchinson and by Nielsen and Tvergaard so as to better predict fracture under a wide range of stress states, especially with low levels of stress triaxiality. These extensions have made the identification of the material parameter more complicated. In this work an identification strategy has been proposed using tests on specimens with different shapes. The identified parameter values are validated and the fracture model show good predictive capability over a wide stress state range.

show abstract

“…Recently, several researchers (Kim et al 2003(Kim et al , 2004Bao and Wierzbicki 2004;Gao et al 2005;Gao and Kim 2006;Kim et al 2007;Barsoum and Faleskog 2007a, b;Bai and Wierzbicki 2008;Br€ unig et al 2008;Gao et al 2009) have shown that the Lode angle, which is associated to the third invariant of the deviatoric stress tensor, is an essential parameter in the characterization of the effect of the stress state on material yielding and on ductile fracture. In particular, Bai and Wierzbicki (2008) have suggested a three-dimensional fracture loci on the space of equivalent strain, stress triaxiality, and Lode angle.…”

Section: Constitutive Models For Ductile Failure Under High and Low Tmentioning

confidence: 99%

Ductile Failure Modelling: Stress Dependence, Nonlocality, and Damage to Fracture Transition

Pires

Andrade³

et al. 2013

Handbook of Damage Mechanics

View full text Add to dashboard Cite

In this chapter, some recent developments and proposals for improvement of material models at the constitutive level to deal with ductile damage at large plastic strains are addressed. Numerical tests are carried out to test their performance on shear-dominated stress states where their main differences lie. Subsequently, aspects of the use of nonlocal models for the regularization of the numerical values associated with damage models, namely, discretization dependency, are reviewed. Different approaches on the choice of the regulation variable or variables are tested at different stress states characterized by different values of triaxiality and third invariant of the deviatoric stress tensor. Finally, a simple strategy on how to handle the transition from damage to fracture by means of the extended finite element method is described.

show abstract

Modeling of crack growth in ductile solids: a three-dimensional analysis

Cited by 90 publications

References 28 publications

Modeling ductile to brittle fracture transition in steels—micromechanical and physical challenges

Modeling ductile to brittle fracture transition in steels—micromechanical and physical challenges

Experimental characterization and numerical modeling of micromechanical damage under different stress states

Ductile Failure Modelling: Stress Dependence, Nonlocality, and Damage to Fracture Transition

Contact Info

Product

Resources

About