Accession Number:

ADA343323

Title:

Analytical Modeling of High Rate Processes.

Descriptive Note:

Final rept. 1 Sep 94-31 Aug 97,

Corporate Author:

ALABAMA UNIV TUSCALOOSA DEPT OF AEROSPACE ENGINEERING AND MECHANICS

Personal Author(s):

• Jones, S. E.

Report Date:

1998-04-13

Pagination or Media Count:

4.0

Abstract:

Research was undertaken to deduce the mechanical properties of materials that are not usually candidates for Taylor test analysis. The Taylor test is a very promising method for acquiring data in the 10000 - 1000000 sec. Strain rate regime. It may be the only for deducing the state of stress for these strain rates, if high strains are required. The Taylor test is usually performed for ductile metals for which there is a recovered specimen and elastic unloading is insignificant. However, many of the materials that presently interest the Air Force are not of this nature. Polymers are not of this nature. They have large elastic strains and the recovered specimen is usually of no value in determining the states of stress that the specimen has experienced during the deformation process. This is also true of some energetic materials. The mechanical behavior of energetics is of paramount importance to the Air Forces Hard Target Penetrator designers. In order to accomplish their objective, the computational mechanics group requires the mechanical behavior of energetic materials in a regime of strain rates that are consistent with impact and penetration events. This leads us to the direction that the work supported by AFOSR has taken.

Descriptors:

• *STRESS STRAIN RELATIONS
• *MECHANICAL PROPERTIES
• IMPACT TESTS
• DEFORMATION
• ELASTIC PROPERTIES
• STRAIN RATE
• PENETRATION
• DUCTILITY
• ENERGETIC PROPERTIES

Subject Categories:

• Test Facilities, Equipment and Methods
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE