Abstract
The final crack and fracture damage found in hemispherically-ended ‘Perspex’ (PMMA) rods loaded explosively by electrical detonators at their hemispherical end is described. The mechanisms of the formation of the major features are also considered.
The most significant feature observed occurs as a Hertzian cone crack which develops to form a completely closed crack surface in the shape of a cardioid (heart-shape) solid of revolution. Also associated with these features are small areas of crazing and spalling generated by stress wave reflections.
Résumé
On décrit le dommage final par fissuration et par rupture occasionnés dans des barreaux à extrémités hémisphériques en Perspex par une charge explosive agissant à ces extrémités.
La caractéristique la plus significative qui a été observée est le développement de la forme de la fissure, qui passe d'un cône de Hertz à celle d'un solide de révolution en forme de coeur.
On trouve associée à cette constatation le présence de petites zones d'écaillage générées par les réflections des ondes de choc.
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Williams, D.J., Walters, B.J. & Johnson, W. Crack patterns in cylinders explosively loaded at an hemispherical end. Int J Fract 23, 271–279 (1983). https://doi.org/10.1007/BF00020695
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DOI: https://doi.org/10.1007/BF00020695