Cumulative charge penetration brittle material

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A shaped charge is an explosive charge shaped to focus the effect of the explosive's energy. Various types are used to cut and form metal, initiate nuclear weapons , penetrate armor , and perforate wells in the oil and gas industry. A typical modern shaped charge, with a metal liner on the charge cavity, can penetrate armor steel to a depth of seven or more times the diameter of the charge charge diameters, CD , though greater depths of 10 CD and above [1] [2] have been achieved. Contrary to a widespread misconception possibly resulting from the acronym HEAT , short for high-explosive anti-tank warhead the shaped charge does not depend in any way on heating or melting for its effectiveness; that is, the jet from a shaped charge does not melt its way through armor, as its effect is purely kinetic in nature [3] — however the process does create significant heat and often has a significant secondary incendiary effect after penetration. The Munroe or Neumann effect is the focusing of blast energy by a hollow or void cut on a surface of an explosive.
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Shaped charge

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Shaped charge - Wikipedia

Argimbaev , Assistant, Candidate of Engineering Sciences. The article describes an integrated approach to study generation of an explosive jet and its penetration depth in marble and granite under directional destruction with elongated jet charges. It is found that the basic condition of an explosive jet knife penetration is that the pressure at the interface exceeds dynamic compressive strength of rocks. The X-ray pattern of the process of the explosive jet penetration in a rock slab is presented together with the data of lab tests on jet penetration depths in case of different focus distances to a rock block.
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