A comparative study of three groups of ductile fracture loci in the 3D space

Bai, Yuanli; Wierzbicki, Tomasz

doi:10.1016/j.engfracmech.2014.12.023

Cited by 163 publications

(30 citation statements)

References 60 publications

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“…the phenomenological ductile fracture theories for crack-free bodies [17]), the most appealing feature of the TCD is its simplicity: various types of non-linearities can be accommodated into a framework that is entirely linear-elastic. Furthermore, when using the TCD to design real components, the static assessment can be performed by introducing only two additional material parameters, which can be determined easily using conventional standard testing equipment.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Assessing the integrity of steel structural components with stress raisers using the Theory of Critical Distances

Susmel

Askes

et al. 2016

Engineering Failure Analysis

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Please cite this article as: Li Wenchao, Susmel Luca, Askes Harm, Liao Fangfang, Zhou Tianhua, Assessing the integrity of steel structural components with stress raisers using the Theory of Critical Distances, (2016), doi: 10.1016/j.engfailanal.2016.07.007 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Abstract: This paper assesses and evaluates the detrimental effect of standard and complex geometrical features on the static strength of samples made of Q460 steel. The experimental results generated by testing four types of notched specimens were analyzed using the Theory of Critical Distances (TCD). The considered configurations included uniaxial tension tests on standard notched round bars and double-side U-notched flat plate specimens. In particular, our attention was focused on the fracture behavior of two specimens containing complex geometrical features subjected to pure-shear and tensile-shear local stress states. The common feature of these two notched specimens was that cracks were seen to initiate, within the material, away from the stress raisers, even though obvious stress concentrations existed at notch tip. The performed validation exercise confirms the accuracy and reliability of the linear-elastic TCD in estimating the fracture initiation position and static strength of standard notched round bars and double-side U-notched flat plate specimens. In the meantime, the linear-elastic method proposed in this paper can also be used as an effective approach to assess the fracture behavior of metallic components having complex geometry. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTKey words: notches; Theory of Critical Distances; static failure; fracture; structural steel A C C E P T E D M A N U S C R I P TACCEPTED MANUSCRIPT 2 1.IntroductionMany engineering investigations have demonstrated that failure of engineering components takes place in the vicinity of notches, cracks and complex geometrical features. Further, micro defects due to manufacturing usually tend to concentrate themselves in these regions with a weakening effect on the overall strength of the components. In parallel, stress concentration phenomena and the resulting local multiaxial stress states accelerate the crack initiation process. In this context, it is key to provide structural engineers with design methods suitable for evaluating the detrimental effect of notches on the overall strength of engineering components.The Theory of Critical Distances (TCD) [1] is a group of failure criteria which make use of the local linear-elastic stress fields in the vicinity of the assumed crack initiation locations to estima...

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Assessing the integrity of steel structural components with stress raisers using the Theory of Critical Distances

Susmel

Askes

et al. 2016

Engineering Failure Analysis

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“…The nucleation of voids, their growth and coalescence, is usually seen as the predecessor of ductile fracture. Recently, Bai and Wierzbicki [15] published a comparative study on twelve ductile fracture models and divided them into three groups, physics based, empirical and phenomenological models. Two general types of approaches to capture ductile fracture are described in literature [16].…”

Section: Introductionmentioning

confidence: 99%

Characterization of ductile fracture properties of quench-hardenable boron steel: Influence of microstructure and processing conditions

Golling

Östlund

Oldenburg

2016

Materials Science and Engineering: A

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Developments of the hot stamping technology have enabled the production of components with differential microstructure composition and mechanical properties. These can increase the performance of certain crash-relevant automotive structures by combining high intrusion protection and energy absorption. This paper presents a comprehensive experimental investigation on the flow and ductile fracture properties of boron-alloyed steel with a wide range of different microstructure compositions. Three types of dual phase microstructures at three different volume fractions, and one triple phase grade, were generated by thermal treatment. Flow curves extending beyond necking and the equivalent plastic strain to fracture for each grade was determined by tensile testing using fullfield measurements. The influence of phase composition and microstructural parameters were further investigated by means of a multi-scale modeling approach based on mean-field homogenization in combination with local fracture criteria. Inter-phase and intra-phase fracture mechanisms were considered by adopting two separate fracture criteria formulated in terms of the local average stress field. The micromechanical model captures with useful accuracy the strong influence of microstructure and processing conditions on the flow and fracture properties, implying promising prospects of mean-field homogenization for the constitutive modeling of hot stamped components.

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“…Many published experimental reports [17] have shown that fracture strain decreases with increasing triaxiality, although the dependence is not monotonic as in Figure 1. A peak is normally found near the 1/3 value, which corresponds to a smooth tensile test.…”

Section: Uncoupled Fracture Modelsmentioning

confidence: 90%

Using DEFORM Software for Determination of Parameters for Two Fracture Criteria on DIN 34CrNiMo6

Poláková¹,

Zemko²,

Rund³

et al. 2020

Metals

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The aim of this study was to calibrate a material model with two fracture criteria that is available in the DEFORM software on DIN 34CrNiMo6. The purpose is to propose a type of simple test that will be sufficient for the determination of damage parameters. The influence of the quantity of mechanical tests on the accuracy of the fracture criterion was explored. This approach was validated using several tests and simulations of damage in a tube and a round bar. These tests are used in engineering applications for their ease of manufacturing and their strong ability to fracture. The prediction of the time and location of the failure was based on the parameters of the relevant damage model. Normalized Cockroft-Latham and Oyane criteria were explored. The validation involved comparing the results of numerical simulation against the test data. The accuracy of prediction of fracture for various stress states using the criteria was evaluated. Both fracture criteria showed good agreement in terms of the fracture locus, but the Oyane criterion proved more suitable for cases covering larger triaxiality ranges.

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A comparative study of three groups of ductile fracture loci in the 3D space

Cited by 163 publications

References 60 publications

Assessing the integrity of steel structural components with stress raisers using the Theory of Critical Distances

Assessing the integrity of steel structural components with stress raisers using the Theory of Critical Distances

Characterization of ductile fracture properties of quench-hardenable boron steel: Influence of microstructure and processing conditions

Using DEFORM Software for Determination of Parameters for Two Fracture Criteria on DIN 34CrNiMo6

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