Kolsky Stress Waves In Solids Pdf Download
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IT is also well known that the presence of a periodic stress pulse in a solid, or in a membrane under tension2 will produce stresses at the position of a stress variation. These stresses are relatively small being only proportional to the strength of the stress pulse. When the stress pulse is very large, the associated stress waves will become very strong and can lead to the development of cracks. In terms of energy it can be shown that the stress tensor has a component p perpendicular to the interface referred to as the preponderant stress and an oblique stress component p vertical to the interface ll =. The stress waves are polarized in a direction perpendicular to the interface due to the fact that the surface of vitreous transition in the solid will remain plane to the interface. As in the case of fluid waves, the surface responses are those of a linear elastic material, the mechanical energy of which is gradually dissipated due to the presence of interface friction and viscosity, so that the shock front gradually broadens with time, as soon as it becomes sufficiently strong to overcome these losses. Much of the literature relating to these phenomena is concerned with the effect of a stress pulse on a crack tip in a block of rock occurring in geologic faults, with the stress pulse being produced by a change in stress strength or by a near surface fault. This will lead to a stress variation on the fault plane which will produce a stress variation in the surrounding matrix and cause the fault to open up, generally in a wedge shaped manner. The opening of a fracture as a result of a stress pulse will lead eventually to a stress concentrator, known as a secondary path, which is followed by an avalanche of delamination, another type of fracture process which will lead eventually to a fragmentation process. Studies of...
IT is now well known that the presence of a periodically varying surface stress across the thickness of a block of material causes a stress concentration similar to that arising from a steady planar stress or one applied across the thickness of a piece of a material. The result is the development of a smooth tip surface of cracking material due to the formation of a stable crack. This can be by a rough surface material, or by a smooth material, as in the case of a glass fribourgite. 7211a4ac4a