Accession Number:

ADA370577

Title:

Behavior of Materials in a Dynamic Environment: Summary of Phase II Results

Descriptive Note:

Final rept.

Corporate Author:

DOW CHEMICAL CO MIDLAND MI

Personal Author(s):

• El-Raheb, M.
• Weber, K.
• Hohler, V.

Report Date:

1999-07-01

Pagination or Media Count:

235.0

Abstract:

A theoretical and experimental study was conducted on stress waves and ballistic performance of weakly coupled stacks of AlN tiles bonded by thin polyurethane films. The cylindrical projectile was made of tungsten alloy with LD 6 weighing 61g at a velocity close to 1170 ms striking the stack centrally. Total thickness of the stack ranged between 3 and 1.5, and with individual tile thicknesses of 1.5, 0.75, 0.5 and 0.25. Ballistic performance was evaluated by the DOP method into an aluminum block. For the 1.5 unconfined stack, DOP of the monolith was highest with substantial scatter, while DOP of the 0.75 layer stack was lowest with reduced scatter. DOP then rises smoothly for the 0.5 and 0.25 layer stacks while scatter is reduced further. Trends of this behavior is partly explained by analysis valid up to crack initiation. An important feature of all DOP results is the dominance of self-confinement.

Descriptors:

• *PROJECTILES
• *DEPTH
• *CERAMIC MATERIALS
• *PENETRATION
• *BALLISTICS
• *STRESS WAVES
• POLYMERS
• IMPACT TESTS
• THIN FILMS
• ALUMINUM
• POLYURETHANE RESINS
• TUNGSTEN ALLOYS
• ARMOR PLATE
• NITRITES

Subject Categories:

• Ceramics, Refractories and Glass
• Armor

Distribution Statement:

APPROVED FOR PUBLIC RELEASE