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Significance Statement
In this paper we review a number of important recent experimental and theoretical developments in the field of dynamic fracture, which is of prime importance for understanding the strength and failure of materials. Topics include experimental validation of the equations of motion for straight tensile cracks (in both infinite media and strip geometries), validation of a new theoretical description of the singular near-tip fields of dynamic cracks incorporating weak elastic nonlinearities, a new understanding of dynamic instabilities of tensile cracks in both two- and three-dimensions, crack front dynamics, and the relation between frictional motion and dynamic shear cracks. Related future research directions are also briefly discussed.
Figure legends: Singular stress (strain) fields drive cracks in brittle materials.
Top: The theoretical (tensile component) of the singular stress field at the tip of a crack moving at approximately half of the material’s shear wave speed.
Bottom: This singular field can now be measured experimentally by using soft materials. Shown is a photograph of a crack propagating at the same (scaled) speed through a brittle aqueous gel. The deformation of a 50 micron grid imprinted on the gel provides an instantaneous real-time measurement of the singular strain (stress) fields surrounding the crack’s tip.
Journal Reference
International Journal of Fracture, pp 1-25, First online: 13 August 2015
Jay Fineberg1 , Eran Bouchbinder2
[expand title=”Show Affiliations”]- Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem, 91904, Israel
- Chemical Physics Department, Weizmann Institute of Science, Rehovot, 7610001, Israel
Abstract
We briefly review a number of important recent experimental and theoretical developments in the field of dynamic fracture. Topics include experimental validation of the equations of motion for straight tensile cracks (in both infinite media and strip geometries), validation of a new theoretical description of the near-tip fields of dynamic cracks incorporating weak elastic nonlinearities, a new understanding of dynamic instabilities of tensile cracks in both 2D and 3D, crack front dynamics, and the relation between frictional motion and dynamic shear cracks. Related future research directions are briefly discussed.
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