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A novel testing method was developed to evaluate the fracture toughness of ultra-high-strength (UHS) steel sheets. The study also examined the influence of specimen thickness, utilizing specimens of varying thicknesses (1.6 ~ 10 mm). While the toughness of all specimens was determined by the threshold for planar crack propagation originating from the fatigue pre-crack-front near the mid-thickness zone, the apparent fracture toughness was dependent on specimen thickness. This phenomenon was attributed to the crack-closure effects experienced during the pre-cracking process. In-depth analyses revealed that, in the absence of crack-closure effects, the intrinsic toughness remained unaffected by changes in specimen thickness.

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• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: Ultra-high-strength steel, Fracture toughness, Thickness effect, Crack-closure, MT specimen

Date published: 2024-07-17

Publisher: Elsevier BV

Journal:

• Engineering Fracture Mechanics (ISSN: 00137944) 110322

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4914

First published URL: https://doi.org/10.1016/j.engfracmech.2024.110322

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Updated at: 2024-11-01 13:08:08 +0900

Published on MDR: 2026-07-17 08:34:15 +0900