Influence of hydrostatic stress on failure of axisymmetric notched specimens

Alves, Marcı́lio; Jones, Norman

doi:10.1016/s0022-5096(98)00060-x

Cited by 124 publications

(60 citation statements)

References 16 publications

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“…However, it can be seen that the Bridgman approximation is not accurate. In fact, large differences between the Bridgman solutions and detailed FE solutions have been recently found in several works (Alves and Jones 1999;Valiente 2001;La Losa et al 2001, 2003Bao 2005;Kim et al 2006). These results suggest that caution should be exercised when applying the Bridgman approximation to estimate the stress triaxiality in notched bar tests.…”

Section: Variations Of Stress Triaxialitymentioning

confidence: 91%

“…At that time, the stress and strains at failure were calculated by the approximate formula of Bridgman (1952), which could be inaccurate. A number of numerical solutions have been reported and comparisons with Bridgman's formula have been made (Alves and Jones 1999;Valiente 2001;La Losa et al 2001, 2003Bao 2005;Kim et al 2006). The stress-modified critical strain concept also led to the concept of failure locus curve (Theocaris 1995;Schluter et al 1996;Schiffman et al 1998) and was extended to simulate crack-tip failure processes (Hancock and Cowling 1980).…”

Section: Introductionmentioning

confidence: 99%

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Development of stress-modified fracture strain for ductile failure of API X65 steel

Oh¹,

Kim

Baek

et al. 2007

Int J Fract

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The present paper proposes ductile failure criteria in terms of true fracture strain (the equivalent strain to fracture) as a function of the stress triaxiality (defined by the ratio of the hydrostatic stress to the equivalent stress) for the API X65 steel. To determine the stress-modified fracture strain, smooth and notched tensile bars with four different notch radii are tested, from which true fracture strains are determined as a function of the notch radius. Then detailed elastic-plastic, large strain finite element analyses are performed to estimate variations of stress triaxiality in the tensile bars, which leads to true fracture strains as a function of the stress triaxiality, by combining them with experimental results. Two different failure criteria are proposed, one based on local stress and strain information at the site where failure initiation is likely to take place, and the other based on averaged stress and strain information over the ligament where ductile fracture is expected. As a case study, ligament failures of API X65 pipes with a gouge are predicted and compared with experimental data.

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Section: Variations Of Stress Triaxialitymentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Development of stress-modified fracture strain for ductile failure of API X65 steel

Oh¹,

Kim

Baek

et al. 2007

Int J Fract

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show abstract

“…Less is known about strain development and stress-strain field at the notch root, which is also important for the failure process, namely for the interaction with the environment. The presence of a notch causes the fracture starting preferentially from the notch root, compared to the classical formation in the middle of smooth tensile specimens [8][9][10]. Several notched specimens, with the surface treated before test to provide wetting, were tested in liquid Pb at 350 • C and underwent LME in both applied displacement rates.…”

Section: Introductionmentioning

confidence: 99%

Behavior of the Steel T91 under Multi Axial Loading in Contact with Liquid and Solid Pb

Gabriele

Hojná

Chocholoušek

et al. 2017

Metals

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Abstract:In this work, the conditions for the occurrence of Liquid Metal Embrittlement (LME) in the ferritic-martensitic steel T91 in contact with lead, Pb, were examined. Slow tensile tests with notched specimens revealed that in a temperature range close to the melting point of Pb, the steel is sensitive to LME (350-400 • C) and to Solid Metal Induced Embrittlement (SMIE) (300 • C). The cracking was stimulated by wetting (using a chemical flux) and the notch effect. It was found that the multi axial stresses state and the high level of plastic strain in front of the notch were the key factors triggering crack initiation.

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“…As strain-rate hardening stabilizes strain concentration, the true strain to fracture has to decrease (see [12] and [13]), even though the elongation to fracture may be constant. Further, scale effects [14] and triaxial strain-state dependence [15] has been observed in strain-rate dependent fracture occurrences.…”

Section: Materials Strength and Plastic Hardeningmentioning

confidence: 97%

Evaluation of Nonlinear Material Behavior for Offshore Structures Subjected to Accidental Actions

Storheim¹,

Alsos

Amdahl

2017

Volume 3A: Structures, Safety and Reliability

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Evaluation of the nonlinear structural response of any structure is a challenging task; a range of input parameters are needed, most of which has significant statistical variability and the evaluations require a high degree of craftsmanship. Hence, high demands are set forth both to the analyst and the body in charge of verification of the results. Recent efforts by DNVGL attempts to mitigate this with the second edition of the DNVGL-RP-C208 for determination of nonlinear structural response, in which guidance or requirements are given on many of the challenging aspects. This paper discuss the various challenges and the direction to which the RP-C208 points compared to published research. Parameters affecting the plastic hardening, strain-rate effects and ductile fracture are discussed separately. Then, the combined effect of the range of assumptions is evaluated to assess the resulting level of safety.

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Influence of hydrostatic stress on failure of axisymmetric notched specimens

Cited by 124 publications

References 16 publications

Development of stress-modified fracture strain for ductile failure of API X65 steel

Development of stress-modified fracture strain for ductile failure of API X65 steel

Behavior of the Steel T91 under Multi Axial Loading in Contact with Liquid and Solid Pb

Evaluation of Nonlinear Material Behavior for Offshore Structures Subjected to Accidental Actions

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