Fast cracks in high-speed photographs of shocked diamond
Résumé
Six fracture surfaces have been observed extending at velocities between cR (the Rayleigh wave velocity) and 1.3cR in high-speed photographs of four diamond specimens. The diamonds were embedded in a transparent polymer and shocked in plate impact experiments. The measured velocities exceed limiting velocities proposed in theoretical and practical studies of single mode I cracks in diamond. The fracture surfaces probably extend by initiation and coalescence of multiple tensile fractures along a single cleavage plane. This mechanism is dependent on the suppression of cracks branching from the {111} growth plane in diamond and considers the population of flaws near a propagating crack tip.
Origine : Fichiers produits par l'(les) auteur(s)
Loading...