Acceptor Loads and Response of an Intervening Sand Wall Barrier from the Simultaneous Detonation of 24 Mk82 Donors
Abstract
The loads incident on Mk82 acceptors located two feet from the acceptor side of an intervening 3.5 foot sand wall were evaluated with the aid of hydrocodes, literature, and closed form solutions. The donor side of the sand wall was subject to the simultaneous detonation of a 4 by 6 array of 24 Mk82 donors. The leading edge of the donor array was located at a two foot standoff from the sand wall. The problem was divided into three regimes: (1) the loads promoted on the sand wall from simultaneous detonation of the donors, (2) the response of the barrier and propagation of the donor loads through the sand wall, and, (3) the interaction of the sand wall barrier with the acceptors. The extent to which the loads promoted by the donor couple to the intervening sand wall are greatly affected by the stacking configuration of the donors. This is due to the occurrence of jetting, which occurs between adjacent rows of donors and the existence of rarefied regions that occur between adjacent donor columns. The jetting results in local regions of the wall being subject to very intense pressure distributions. The rarefied regions occurring between donor columns last several hundred microseconds and thwart propagation of loads toward the wall from adjacent columns of donors. The sand wall attenuates high frequency components of the incident wave but is relatively ineffective in attenuating the low frequencies which are the major components of the incident wave. The wall becomes rapidly fluidized and the loads incident on the acceptor are to a large extent governed by the fluid-structure interaction between the multi-phase flow from the barrier debris and the stress wave response of the acceptor.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1992
- Accession Number
- ADA526721
Entities
People
- A. K. Chatterjee
- James Tancreto
- Kevin Hager
- L. Pietrzak
- R. D. Eisler
Organizations
- Naval Facilities Engineering Service Center