Critical assessment of the local cleavage stress σ ƒ * in notch specimens of C-Mn steel

Yan, C., Chen, J.H., Sun, J., & Wang, Z. (1993) Critical assessment of the local cleavage stress σ ƒ * in notch specimens of C-Mn steel. Metallurgical Transactions A, 24(6), pp. 1381-1389.

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An elastic-plastic finite element method (FEM) was used to calculate the stress and strain distributions ahead of notches with various root radii in a bending specimen of C-Mn steel with grain sizes of 10 and 30 μm. By accurately measuring the distance of the cleavage initiation site from the root of the notch, the local cleavage stress σ ƒ* was measured. When the notch radius increased from 0.25 to 1.0 mm, the distribution of high stress had a definite variation but the σ ƒ* remained relatively constant. In notch specimens with different root radii, the critical fracture event is identical,i.e., propagation of a ferrite grain-sized crack into the neighboring matrix. Therefore, the σ ƒ* is mainly determined by the length of the critical microcrack, here, the size of ferrite grain instead of the high stress volume for finding an eligible brittle particle. The critical strain for initiating a crack was about 1 pct. The cleavage site ahead of a notch was related to the relative distributions of stress and strain and the random distribution of the weakest grains. The higher fracture load of the fine-grain material can be attributed to its higher value of σ ƒ* /σo as compared with the coarse-grain. The σ ƒ* /σo is a potential engineering parameter for toughness assessment in notch specimens.

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ID Code: 99650
Item Type: Journal Article
Refereed: Yes
Keywords: fracture, mechanical property, metals and alloys
DOI: 10.1007/BF02668206
ISSN: 0360-2133
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Metals and Alloy Materials (091207)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300) > Numerical Modelling and Mechanical Characterisation (091307)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 04 Oct 2016 03:57
Last Modified: 04 Oct 2016 03:57

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