Energy transfer through a multi-layer liner for shaped charges

Details Energy transfer through a multi-layer liner for shaped charges Energy transfer through a multi-layer liner for shaped charges

1982-09-30

1985-02-12

Sebastian, Leland A.

Ammunition and explosive-charge making

Miscellaneous

29 121, 102306, 102307, 102309, C06B 2100, F42B 3310

Patent

active

044983670

ABSTRACT:
This invention relates to the determination of parameters for selecting materials for use as liners in shaped charges to transfer the greatest amount of energy to the explosive jet. Multi-layer liners constructed of metal in shaped charges for oil well perforators or other applications are selected in accordance with the invention to maximize the penetrating effect of the explosive jet by reference to four parameters: (1) Adjusting the explosive charge to liner mass ratio to achieve a balance between the amount of explosive used in a shaped charge and the areal density of the liner material; (2) Adjusting the ductility of each layer of a multi-layer liner to enhance the formation of a longer energy jet; (3) Buffering the intermediate layers of a multi-layer liner by varying the properties of each layer, e.g., composition, thickness, ductility, acoustic impedance and areal density, to protect the final inside layer of high density material from shattering upon impact of the explosive force and, instead, flow smoothly into a jet; and (4) Adjusting the impedance of the layers in a liner to enhance the transmission and reduce the reflection of explosive energy across the interface between layers.

REFERENCES:
patent: 3077834 (1963-02-01), Caldwell
patent: 3147707 (1964-09-01), Caldwell
patent: 3893814 (1975-07-01), McGhee
patent: 3948184 (1976-04-01), Pierre et al.
patent: 4106411 (1978-08-01), Borcher et al.

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