Fracture in solid spheres and circular disks due to a “point” explosive impulse on the surface
TL;DR: In this article, the results of an experimental study of the fracture of solid spheres and circular disks due to the explosion of a detonator on the surface are presented and a simple analysis is developed which reasonably explains the nature of the characteristic fracture patterns encountered.
About: This article is published in International Journal of Mechanical Sciences.The article was published on 1974-03-01. It has received 14 citations till now. The article focuses on the topics: Explosive material.
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TL;DR: In this article, the internal fracturing of a Perspex sphere due to a localised explosive loading on its surface has been investigated both analytically and experimentally, and the locations and times of occurrence of the fractures are predictable from an analysis of stress wave reflection from the free surface based on the methods of geometrical acoustics.
15 citations
TL;DR: In this article, the authors used density, temperature and residual-stress measurements on Rupert's drops made of three glasses - flint, Pyrex and 80% silica, to provide an explanation for the unusual disintegration of these drops when damaged; the explanation involves stresswave generation and propagation with associated fracturing.
15 citations
TL;DR: In this article, the authors examined fracture and void development in Perspex spheres with bosses (i.e., with cylindrical projections) due to point explosive loading by a detonator using high speed photography.
11 citations
TL;DR: In this article, the locations and times of occurrence of internal fractures in Perspex spheres subjected to localized explosive loading are investigated, and an analysis of stress wave reflection from free boundaries based on the method of geometrical acoustics is found to give predictions which are in good agreement with results obtained from high speed photographs.
10 citations
TL;DR: In this paper, the final crack and fracture damage found in hemispherically-ended "Perspex" (PMMA) rods loaded explosively by electrical detonators at their hemispherical end is described.
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.
5 citations
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TL;DR: In this paper, the separation at the interface of a circular inclusion embedded in a matrix of lower characteristics impedance and subjected to incident compressive waves is investigated, both experimentally and analytically.
Abstract: : Separation at the interface of a circular inclusion embedded in a matrix of lower characteristics impedance and subjected to incident compressive waves is investigated, both experimentally and analytically. In the experiment, the compressive waves were generated by small explosive charges. The qualitative analytical treatment is based on the methods of propagating stress discontinuities. It is shown that a compressive stress wave is converteed into a tensile wave after a refraction and a reflection inside the inclusion. The results of this paper apply to the behavior of fiber-reinforced composites under dynamic loading conditions. (Author, modified-PL).
16 citations
TL;DR: In this paper, two problems of linear wave propagation in a viscoelastic solid sphere are solved based on a superposition principle which reduces the general solution to a static elastic solution, an elastic solution of an eigenvalue problem and an integral equation of the Volterra type involving time only.
15 citations
TL;DR: In this article, a simple analysis which employs cylindrical stress wave equations shows that, as a pulse propagates towards the apex, a compressive head and a tensile tail are developed, both becoming larger as the pulse approaches the apex.
Abstract: Triangular plaster of Paris plates were subjected to contact explosives and photographs of the fracture patterns obtained are presented. The effect of the geometry and the form of loading on the fracture patterns and the length of the spalls are discussed. A simple analysis which employs cylindrical stress wave equations shows that, as a pulse propagates towards the apex, a compressive head and a tensile tail are developed, both becoming larger in magnitude as the pulse approaches the apex. Fracture is produced whenever the tensile stress reaches a magnitude just above the ultimate tensile stress of the plaster; further fractures are also predicted by the analysis. The method of images is used to explain the presence of the longitudinal crack.
11 citations