Abstract
T he optical method of caustics for measuring impact fracture toughness, K Id, is investigated by using two- and three-dimensional elastic finite element methods. It is found that there exists a delay time to detect the crack initiation, and the delay time may result from the fact that it takes a time for the stress wave (due to crack initiation) of sufficient amplitude to have an observable effect on the caustics to reach the location of the initial curve. The delay time may explain to some extent the experimental result that K Id depends on the incident wave form and also on the loading rate for a short time-to-fracture. The distribution of K 1( t) along the crack front is examined and the possible dependence of K Id on the shape of a propagating crack front is also discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
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.