Cleavage Fracture of Ultra-High-Strength Steels. Microscopic Observations. Numerical Analysis. Local Fracture Criterion

Abstract:

In the paper the fracture mechanisms in ultra-high-strength steel are examined. However, the emphasis is on cleavage fracture, which was observed in the whole temperature range tested. The extent of cleavage depends on the specimen thickness and temperature. The experimental program consisted of tensile and fracture tests and was followed by scanning microscope observations of the fracture surfaces. Then, a full 3D elastic-plastic finite element analysis was carried out assuming finite strains. The numerical results support the postulate that the onset of cleavage jump is observed when the maximum opening stresses become higher than the critical value (the material property at a given temperature) over a distance greater than the critical value (material property independent of temperature). A discussion of so-called 3D stress parameters is presented.

• Periodical: Key Engineering Materials (Volume 598)
• Pages: 168-177
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.598.168
• Online since: January 2014
• Authors: Andrzej Neimitz*, Ihor Dzioba, Urszula Janus
• Keywords: Cleavage Fracture, Fracture Local Criteria, High Strength Steel (HSS)

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