Accession Number:

ADA557008

Title:

Impact Experiments into Borosilicate Glass at Three Scale Sizes

Descriptive Note:

Technical rept. May 2008-Nov 2009

Corporate Author:

SOUTHWEST RESEARCH INST SAN ANTONIO TX

Personal Author(s):

• Anderson, Jr, Charles E.
• Weiss, Carl E.
• Chocron, Sidney

Report Date:

2009-11-01

Pagination or Media Count:

78.0

Abstract:

Glass impact experiments were designed at three different scales--0.22-cal, 0.375-cal, and 0.50-cal--named after the diameter of the bullets. Four experimental series were conducted at the three scale sizes 1 Lexan-only experiments 2 monoblock glass experiments 3 single impact bonded glass experiments, and 4 multi-hit experiments. The experiments were conducted to obtain residual velocity as a function of impact striking velocity, including sufficient partial penetrations to calculate a V50. The Vs - Vr data were fit to the Lambert equation, Eqn. 5, to obtain another estimate of V50. Eroded lengths of the bullets were also measured. The objective of the experiments was to investigate whether a time dependency exists in glass damagefailure for ballistic experiments, and if so, try to quantify this dependency. No scale effect was observed in experimental results for the Lexan-only experiments. But a variety of scale effects were observed in the glass impact experiments, suggesting that there exists a time dependency to failure that is important within the timeframe of ballistic events.

Descriptors:

• *SILICA GLASS
• *TERMINAL BALLISTICS
• BORON OXIDES
• CRACKING(FRACTURING)
• DAMAGE
• IMPACT
• POLYCARBONATES
• SMALL ARMS AMMUNITION
• TIME DEPENDENCE

Subject Categories:

• Ceramics, Refractories and Glass
• Ballistics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE