Ductile failure of X100 pipeline steel – Experiments and fractography

Ghajar, Rahmatollah; Mirone, Giuseppe; Keshavarz, Arash

doi:10.1016/j.matdes.2012.07.032

Cited by 47 publications

(19 citation statements)

References 26 publications

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“…11a and b illustrates experimental and numerical results of the shape of cross section in the central zone of specimen respectively. With concordance of the results presented by Ghajar et al [33], the rectangular section, in plastic deformation, necking occurs and causes the sides of minimum section to bend as shown in Fig. 11a.…”

Section: Necking and Localization Of Deformationsupporting

confidence: 88%

Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests

2013

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. Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests. Materials and Design, Elsevier, 2013, vol. 49, pp. 638-646. <10.1016/j.matdes.2013 OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. a b s t r a c tThe aim of the presented investigations is to perform an analysis of fracture and instability during simple and complex load testing by addressing the influence of ductile damage evolution in necking processes. In this context, an improved experimental methodology was developed and successfully used to evaluate localization of deformation during uniaxial and biaxial tensile tests. The biaxial tensile tests are carried out using cruciform specimen loaded using a biaxial testing machine. In this experimental investigation, Stereo-Image Correlation technique has is used to produce the heterogeneous deformations map within the specimen surface. Scanning electron microscope is used to evaluate the fracture mechanism and the micro-voids growth. A finite element model of uniaxial and biaxial tensile tests are developed, where a ductile damage model Gurson-Tvergaard-Needleman (GTN) is used to describe material deformation involving damage evolution. Comparison between the experimental and the simulation results show the accuracy of the finite element model to predict the instability phenomenon. The advanced measurement techniques contribute to understand better the ductile fracture mechanism.

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Section: Necking and Localization Of Deformationsupporting

confidence: 88%

Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests

2013

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“…[17][18][19][20][21]23,24 Based on Rice and Tracey's model, the effective triaxiality causing the equivalent damage was in the expression of equation (11) calculated from equation (10)…”

Section: Effective Triaxialitymentioning

confidence: 99%

Fracture strain of gun steel for ultra-high-pressure vessels considering triaxiality effect

2017

Advances in Mechanical Engineering

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To better understand the local failure of ultra-high-pressure vessels, the ductile fracture behavior of a gun steel, PCrNi 3 MoVA used for ultra-high-pressure vessel in China, was studied through experimental and numerical investigations. Tests on smooth and notched specimens of different notch radius values were performed, and the stressstrain states of specimens in the loading history were obtained through finite element analysis. Fracture was identified by means of comparing the engineering stress versus the strain obtained from tests with the finite element analysis results. The effect of triaxiality on the ductile fracture behavior of PCrNi 3 MoVA was discussed. Finally, a new plastic design-by-analysis method considering triaxiality effect was proposed to protect against local failure of ultrahigh-pressure vessels.

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“…Fig. 7b shows that several white bands of phosphorus A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 12 segregation appear in the core of the cross section of the pre-tensile specimen. Fig.…”

Section: Microstructure and Microhardness Analysismentioning

confidence: 99%

“…Zorc et al [11] argued that a cleavage fracture occurred in the central part of a thick S355 J2 G3+N steel plate due to the residual tensile stresses, caused by phosphorus segregation. Ghajar et al [12] postulated that the driving forces for delamination in macro scale were high values of triaxiality and severe necking.…”

Section: Introductionmentioning

confidence: 99%

A study of the mechanism of delamination fracture in bainitic magnetic yoke steel

Tao

Yan

et al. 2016

Materials & Design

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Ductile failure of X100 pipeline steel – Experiments and fractography

Cited by 47 publications

References 26 publications

Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests

Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests

Fracture strain of gun steel for ultra-high-pressure vessels considering triaxiality effect

A study of the mechanism of delamination fracture in bainitic magnetic yoke steel

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