Transferability of fracture parameters from specimens to component level

Pavankumar, T. V.; Samal, M. K.; Chattopadhyay, J.; Dutta, B.K.; Kushwaha, H. S.; Roos, Eberhard; Seidenfuß, Michael

doi:10.1016/j.ijpvp.2004.10.003

Cited by 33 publications

(25 citation statements)

References 18 publications

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“…After f c , the increase in void volume fraction gets accelerated and final fracture of the material point occurs at final void volume fraction f f . In the continuum damage mechanics models, these parameters are determined from combined numerical simulation and metallurgical observations of microscopic voids as described in references [21], [27], [31], [37] to [39], [42], and [43]. For the materials under consideration here, the details of the selection of the parameters will be discussed in the next section.…”

Section: Evolution Of the Void Volume Fraction Due To Plastic Deformamentioning

confidence: 99%

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An experimental and numerical investigation of fracture resistance behaviour of a dissimilar metal welded joint

Samal

Balani

Seidenfuß

et al. 2009

Proceedings of the Institution of Mechanical Engineers, Part C:

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Dissimilar welds impose a challenge to the engineers concerned with the structural integrity assessment of these joints. This is because of the highly inhomogeneous nature of these joints in terms of their microstructure, mechanical, thermal, and fracture properties. Fracture mechanics-based concepts cannot be directly used because of the problems associated with the definition of a suitable crack-tip loading parameter such as J -integral crack tip opening displacement (CTOD), etc. Again, depending upon the location of initial crack (i.e. base, weld, buttering, different interfaces, etc.), further crack propagation can occur in any material. The objective of the current work is to use micro-mechanical models of ductile fracture for initiation and propagation of cracks in the bimetallic welds. The authors have developed a finite element formulation that incorporates the porous plasticity yield function due to GursonTvergaard-Needleman and utilized it here for the analysis. Experiments have been conducted at MPA Stuttgart using single edge-notched bend (SEB) specimens with cracks at different locations of the joint. The micro-mechanical (Gurson) parameters of four different materials (i.e. ferrite, austenite, buttering, and weld) have been determined individually by simulation of fracture resistance behaviour of SEB specimens and comparing the simulated results with those of the experiment. In order to demonstrate the effectiveness of the damage model in predicting the crack growth in the actual bimetallic-welded specimen, simulation of two SEB specimens (with initial crack at ferrite-buttering and buttering-weld interface) has been carried out. The simulated fracture resistance behaviour compares well with those of the experiment.

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Section: Evolution Of the Void Volume Fraction Due To Plastic Deformamentioning

confidence: 99%

“…Many times, the notched tensile specimens are also used [23,25,39]. The critical void volume fraction for coalescence f c is determined by comparing the true fracture strain from experiment with that of numerical simulation.…”

Section: Evolution Of the Void Volume Fraction Due To Plastic Deformamentioning

confidence: 99%

An experimental and numerical investigation of fracture resistance behaviour of a dissimilar metal welded joint

Samal

Balani

Seidenfuß

et al. 2009

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…6 carbon steel material used in the PHT system of Indian nuclear power plant [8]. The experimentally [9][10][11] obtained properties of SA333 Gr. 6 carbon steel material are used as the effective properties of the homogeneous continuum.…”

Section: Introductionmentioning

confidence: 99%

Evaluating a valid fracture specimen geometry for predicting geometry independent SZWc and JSZW value in SA333 Gr. 6 carbon steel material

Saxena

Dutta

Sasikala

2015

Engineering Fracture Mechanics

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“…A reverse problem occurs when the fracture toughness data are obtained on relatively low-constraint specimens and then used in high constraint applications. This would make the design non-conservative (Pavankumar et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Micromechanical modelling of weldments using GTN model

et al. 2010

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Non-transferability of fracture data from specimen level to component level is a serious limitation of conventional fracture mechanics, as fracture resistance data obtained is largely geometry dependant. The difficulty is largely overcome by GTN model which models the drop in load carrying capacity of a material with the increase in plastic strain, considering nucleation, growth and coalescence of micro-voids in the material. However, determination of the modelparameters with experiments is extremely difficult and doubtful. Hence, a parameter-study has been done to find out the effects of different parameters on material behaviour to asses the parameter for best practical result with least metallographic study. The parameters were finally verified by predicting ductile fracture in a real life piping component.

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Transferability of fracture parameters from specimens to component level

Cited by 33 publications

References 18 publications

An experimental and numerical investigation of fracture resistance behaviour of a dissimilar metal welded joint

An experimental and numerical investigation of fracture resistance behaviour of a dissimilar metal welded joint

Evaluating a valid fracture specimen geometry for predicting geometry independent SZWc and JSZW value in SA333 Gr. 6 carbon steel material

Micromechanical modelling of weldments using GTN model

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