Abstract
Previous experimental results have shown that there is a marked increase in fracture toughness in a slightly predeformed low alloy steel, namely AISI 4340 steel. This increase in toughness was attributed to an excessive blunting at the crack tip due to the presence of a high mobile dislocation density. A dislocation model is proposed to explain the crack tip blunting in predeformed low alloy steels which leads to an equation relating the fracture toughness parameter J Ic to the mobile dislocation density in the vicinity of the crack and the extent of work hardening in the plastic zone. The model accurately predicts the dislocation behaviour ahead of the crack and can be used to calculate the fracture toughness in materials which exhibit considerable plasticity at the crack tip.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
