A probabilistic model to predict specimen geometry effects on fracture toughness in ferritic–pearlitic steels
This work describes a probabilistic framework for cleavage fracture of ferritic–pearlitic steels incorporating experimental measurements of microcrack distribution associated with the cracking of the pearlitic microstructure. A central objective of this study is to explore and further extend applica...
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Veröffentlicht in: | Engineering fracture mechanics 2024-11, Vol.310, p.110493, Article 110493 |
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Sprache: | eng |
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Zusammenfassung: | This work describes a probabilistic framework for cleavage fracture of ferritic–pearlitic steels incorporating experimental measurements of microcrack distribution associated with the cracking of the pearlitic microstructure. A central objective of this study is to explore and further extend application of a probabilistic framework incorporating the statistics of microcracks to predict specimen geometry effects on the fracture toughness distribution for a typical ferritic–pearlitic structural steel. Fracture toughness values for an ASTM A572 Grade 50 structural steel derived from fracture tests using conventional SE(B) specimens with varying thickness and a/W-ratios provide the cleavage fracture resistance data needed to assess specimen geometry effects on the probability distribution of Jc-values. The present exploratory study successfully predicts the measured statistical distribution of cleavage fracture toughness in shallow crack specimens and provides further support of the proposed probabilistic model as a more advanced and effective engineering-level procedure in fracture assessment methodologies.
•Incorporation of the distribution of fracture-triggering particles into the probabilistic model.•The pearlite grain thickness distribution establishes the microcrack distribution.•Standard metallographic analyses suffice to obtain estimates of the microcrack distribution.•Use of a simplified and effective two-step method to calibrate the key parameters γf and λ.•The proposed approach removes the geometry dependence of fracture toughness. |
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ISSN: | 0013-7944 |
DOI: | 10.1016/j.engfracmech.2024.110493 |