Confirming the continuum theory of dynamic brittle fracture for fast cracks

Eran Sharon and Jay Fineberg ()
Additional contact information
Eran Sharon: The Racah Institute of Physics, The Hebrew University of Jerusalem
Jay Fineberg: The Racah Institute of Physics, The Hebrew University of Jerusalem

Nature, 1999, vol. 397, issue 6717, 333-335

Abstract: Abstract Crack propagation is the basic mechanism of materials failure. Experiments on dynamic fracture in brittle amorphous materials have produced results1 that agree with theoretical predictions for single-crack motion at very low velocities. But numerous apparent discrepancies with theory have been observed2,3,4 at higher velocities. In particular, the maximum crack velocities attained in amorphous materials are far slower than the predicted asymptotic value, vR (ref. 3). Beyond a critical velocity, vc ≈ 0.4vR, an intrinsic instability has been observed5 in which a multiple-crack state is formed by repetitive, frustrated micro-branching events. These cause velocity oscillations and may explain the apparent anomaly. Here we report measurements of dynamic fracture in a brittle, amorphous material that are in quantitative agreement with the theoretical single-crack equation of motion, from the initial stages of propagation up to vc. Beyond vc, agreement breaks down owing to the appearance of the multiple-crack ensemble. But in this regime, the micro-branching process can momentarily produce a single-crack state which instantaneously attains its predicted single-crack velocity, for velocities up to 0.9vR. Our results therefore confirm the validity of the single-crack continuum theory of elastic brittle fracture even in the dynamical regime where the crack morphology is complex.

Date: 1999
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/16891 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:397:y:1999:i:6717:d:10.1038_16891

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/16891

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().