Effect of prior ductile tearing on cleavage assessment for high-strength steel under mixed-mode I and II conditions

Zhang, Zefeng; Qian, Xudong

doi:10.1016/j.engfracmech.2017.01.026

Cited by 10 publications

(2 citation statements)

References 43 publications

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“…The Weibull stress model predicates on the experimentally validated weakest‐link assumption and entails a unique relationship between the local scalar Weibull stress ( σ w ) and the global crack driving force ( K J ), which allows successful estimations of the cleavage failure for both the high‐constraint and low‐constraint specimens . Subsequent development of the local Weibull stress approach incorporates the plastic‐strain dependent distribution of the microcrack distribution, the effect of prior ductile tearing, and the assessment of surface cracks and mixed‐mode fracture . Wasiluk et al .…”

Section: Introductionmentioning

confidence: 99%

“…21 Subsequent development of the local Weibull stress approach incorporates the plastic-strain dependent distribution of the microcrack distribution, 22,23 the effect of prior ductile tearing, 24,25 and the assessment of surface cracks 26 and mixed-mode fracture. 27,28 Wasiluk et al 21 have updated the calibration procedure for the Weibull stress parameters, which requires two sets of fracture specimens with contrast differences in the crack-front constraint to resolve the uniqueness issue in calibrating the Weibull stress parameters through a single set of specimens. 29,30 The calibration of the local Weibull stress parameters often requires a significant number of fracture specimens.…”

Section: Introductionmentioning

confidence: 99%

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Effect of experimental sample size on local Weibull assessment of cleavage fracture for steel

Zhang

Qian

2016

Fatigue Fract Eng Mat Struct

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This paper examines the sample size of the experimental datasets in calibrating the Weibull parameters for the modified three‐parameter Weibull stress framework, so as to enhance the experimental strategy for cleavage assessment of ferritic steels based on a local approach. The present work generates a large number of random and independent subsets from the ‘Euro steel’ fracture toughness database for the calibration procedure. The calibration of the Weibull parameters utilizes a subset of high‐constraint specimens and a subset of low‐constraint specimens from the Euro steel database to resolve the uniqueness issue in the calibration procedure reported in previous studies. This investigation reveals strong dependence of the calibrated Weibull modulus on both the constraint differences between the high‐constraint subset and the low‐constraint subset and the size of the selected subsets. The scale fracture toughness value, however, does not exhibit significant dependence on the constraint difference between the two subsets of specimens. The confidence level of the scale fracture toughness, nevertheless, still exhibits strong dependence on the sample size of the experimental data.

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