Abstract
A mechanism of delayed fracture under static load was proposed for fine grained nuclear grade isotropic graphite.Rectangular specimens were loaded in 3-point bending mode to the neighbourhood of the fracture stress and kept at about the same stress level by using an Instron type testing machine. The discrete acoustic emission (AE) signals were generated before the specimen completely fractured. This fact indicates that microcracks are produced or propagate discontinuously within the specimen under static load. This phenomenon was explained by a model in which the microstructure of graphite is regarded as the combination of elastic and plastic parts. According to the model, the stress relaxation in the plastic part induces an increase in stress at the region of crack tips or some kinds of defects in the elastic part.
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 callMore From: Journal of the Society of Materials Science, Japan
Disclaimer: 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.
