Accession Number:

ADA165723

Title:

Contact Surface Erosion for Hypervelocity Problems

Descriptive Note:

Final rept.

Corporate Author:

ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s):

Report Date:

1986-02-01

Pagination or Media Count:

35.0

Abstract:

This paper presents a technique for extending the capability of Lagrangian wave propagation codes to treatment of deep penetration and spaced plate perforation problems. Lagrangian codes as originally developed required that the sliding interfaces specified at the beginning of a problem remain unchanged throughout the computation. This requirement was imposed not from physical considerations but to simplify the programming of the interface logic. Its effect was to prohibit total failure of material dictated by the physical problem i.e., front-face spall, resulting in either unrealistic distortions of the computational grid leading to large truncation errors or minuscule temporal integration increments resulting in uneconomical computations. The contact surface erosion algorithm outlined in this paper permits sliding interfaces to be dynamically relocated as materials exceed their load-bearing capability without a prior specification of the damage region. Results obtained with EPIC-2 into which this algorithm has been incorporated show good agreement with experimental data for deep penetration situations as well as for finite plate perforations at striking velocities of 1.1 - 3.75 kms. Keywords Penetration mechanics, Perforation, Ballistic impact, Computer simulation.

Subject Categories:

  • Ballistics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE