Effect of Strength Mismatch on Ductile Crack Initiation Behavior from Notch Root under Static Loading

An, Gyubaek; Ohata, Mitsuru; Mochizuki, Masahito; Bang, Hee-Seon; Toyoda, Masao

doi:10.4028/www.scientific.net/kem.297-300.756

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…The inherent strain procedure allows the user to refer to a database of inherent strain distributions which have already been found for simple specimens when a joint has been identified as similar to a previously analysed joint. 37,44,45 The procedure also allows the user to find the distribution of residual stress in a component even when it has locations, such as width changes, with complicated residual stress distributions. It would be a difficult task to apply inherent strain experimentally on a physical specimen, but once this database has been constructed, it will allow elastic analysis of the welding residual stresses in a variety of structural types.…”

Section: Investigation Of Methods For Assessing Residual Stress In St...mentioning

confidence: 99%

Evaluation of through thickness residual stress in multipass butt welded joint by using inherent strain

Mochizuki¹

2006

Science and Technology of Welding and Joining

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The through thickness residual stress of an eight pass butt welded plate joint is evaluated using inherent strain analysis. The residual stress distribution is obtained in detail along the thickness direction from measurements using multiple strain gauges. The residual stresses agree with the results of the thermal elastic-plastic analysis as well as the values obtained by direct measurement of the specimen surface, which is not used in inherent strain analysis. These results indicate that both inherent strain analysis and thermal elastic-plastic analysis are effective in evaluating through thickness residual stress. Therefore, each analysis method should be chosen after considering the object to be evaluated and the characteristics to be analysed.

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Section: Investigation Of Methods For Assessing Residual Stress In St...mentioning

confidence: 99%

Evaluation of through thickness residual stress in multipass butt welded joint by using inherent strain

Mochizuki¹

2006

Science and Technology of Welding and Joining

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“…In most research, the default weld metal and base metal have the same hardening characteristics [ 17 , 18 ], and the mechanical property mismatch defines the ratio of yield strength of the weld metal to the base metal [ 19 ]. Based on the finite element model of welded joints simplified as sandwich structure, the effects of strength mismatch on the stress and strain field at the crack tip [ 20 ] and the corresponding fracture toughness [ 21 , 22 ] are studied, ignoring the fusion zone and heat affected zone with the change of yield strength.…”

Section: Introductionmentioning

confidence: 99%

Effect of Yield Strength Distribution Welded Joint on Crack Propagation Path and Crack Mechanical Tip Field

Bi¹,

Yuan

Lv³

et al. 2021

Materials

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Due to the particularity of welding processes, the mechanical properties of welded joint materials, especially the yield strength, are unevenly distributed, and there are also a large number of micro cracks, which seriously affects the safety performance of welded joints. In this study, to analyze the effect of the uneven distribution of yield strength on the crack propagation path of welded joints, other mechanical properties and residual stresses of welded joints are ignored. In the ABAQUS 6.14 finite element software, the user-defined field (USDFLD) subroutine is used to define the unevenly distributed yield strength, and extended finite element (XFEM) is used to simulate crack propagation. In addition, the static crack finite element model of the welded joint model is established according to the crack propagation path, which is given the static crack model constant stress intensity factor load, and the influence of an uneven yield strength distribution on mechanical field is analyzed. The results show that the crack length of welded joints as well as the plastic deformation range of the crack tip in high stress areas can be reduced with the increase of yield strength along the crack propagation direction. Moreover, the crack deflects to the low yield strength side. This study provides an analytical reference for the crack path prediction of welded joints.

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“…Cetinel et al studied the fracture behavior of the weld nodular cast iron affected by under-matching [13,14]. An et al studied the ductile crack initiation behavior affected by strength mismatch [15]. Rakin et al investigated the fracture behavior of the high-strength low alloyed steel weld joint affected by strength mismatch [16].…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Local Strength Mismatch of a Dissimilar Metal Welded Joint in a Nuclear Power Plant

Yang

Wang

2018

Metals

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Local strength mismatch is one of the important factors which affects the fracture behavior of a dissimilar metal welded joint (DMWJ). The question to consider is how to improve the fracture resistance of the DMWJ effectively by optimizing the local strength mismatch. In this paper, a DMWJ in a nuclear power plant was selected, the J-resistance (J-R) curve and crack growth path of the DMWJ under different strength mismatches of heat affect zone (HAZ), fusion zone (FZ), and near interface zone (NIZ) were systemically studied. And then, the optimal design of the local strength mismatch was investigated. The results show that decreasing the strength of HAZ and NIZ and increasing the strength of FZ will increase the fracture resistance of a DMWJ. Increasing the strength of FZ increases the J-R curve obviously. When the M s (HAZ):M s (FZ):M s (NIZ) = 1.12:1.4:1.26 and M s (HAZ):M s (FZ):M s (NIZ) = 1:1.4:1, the DMWJs have the highest J-R curves. Considering that the two J-R curves are similar, it is suggested that the fracture resistance of the DMWJ can be improved only by increasing the strength of the FZ.

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Effect of Strength Mismatch on Ductile Crack Initiation Behavior from Notch Root under Static Loading

Cited by 5 publications

References 9 publications

Evaluation of through thickness residual stress in multipass butt welded joint by using inherent strain

Evaluation of through thickness residual stress in multipass butt welded joint by using inherent strain

Effect of Yield Strength Distribution Welded Joint on Crack Propagation Path and Crack Mechanical Tip Field

Optimizing the Local Strength Mismatch of a Dissimilar Metal Welded Joint in a Nuclear Power Plant

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