@inproceedings{930dce814f4c40448af32773ef5e8aeb,
title = "Research on mode i and mode II dynamic fracture in high strength steels under high loading rates",
abstract = "The Mode I and Mode II dynamic fracture toughness (DFT) values, K Id and KIId for high strength steels 40Cr and 30CrMnSiNi2A were evaluated using a combined experimental-numerical method. The tests were performed on three point bend (3PB) and shear specimens with Hopkinson pressure bar. The time of crack initiation was determined by a strain gauge. With the assistance of 3-D transient finite element analysis, the temporal evolution of the dynamic stress intensity factor under different loading rates was obtained, and the DFT was determined by the fracture initiation time. In Mode I tests, a brittle transgranular fracture was found in 40Cr, while evidence for ductile fracture was observed on the failure surface of 30CrMnSiNi2A. In Mode II tests, both tensile cracks and adiabatic shear bands were found for the two steels. The effect of ligament size on fracture toughness was discussed. The correlations of KId and KIId with loading rate were also investigated. The micromechanisms of loading rate effect on the DFT were discussed for both modes.",
keywords = "Dynamic fracture, High loading rate, High strength steel, Mode I and mode II",
author = "Zejlan Xu and Yulong Li and Masanori Kikuchi",
year = "2008",
doi = "10.4028/www.scientific.net/amr.33-37.351",
language = "English",
isbn = "0878493999",
series = "Advanced Materials Research",
publisher = "Trans Tech Publications",
pages = "351--356",
booktitle = "Advances in Fracture and Materials Behavior - Selected, peer reviewed papers of the Seventh International Conference on Fracture and Strength of Solids (FEOFS2007)",
address = "Germany",
note = "7th International Conference on Fracture and Strength of Solids, FEOFS 2007 ; Conference date: 27-08-2007 Through 29-08-2007",
}