Accession Number:

ADA210986

Title:

Fracture and Three Dimensional Stress Analyses of 7075 Aluminum Projectile Components Under Spin and Inertia Load

Descriptive Note:

Final technical rept.

Corporate Author:

ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS

Personal Author(s):

• Underwood, J. H.
• Scavullo, M. A.
• O'Hara, G. P.
• Konrad, B. A.

Report Date:

1989-06-01

Pagination or Media Count:

27.0

Abstract:

A fracture case study of a high strength aluminum projectile component subjected to inertial and spin loading during launch from a cannon is presented. A three-dimensional finite element model was used to calculate the projectile stresses and to determine which of the several types of loading was the primary cause of failure. A design change to minimize spin loading resulted in a significantly reduced failure incidence. Mechanical and fracture mechanics tests of the aluminum were performed in order to determine material specifications which could prevent failures in the future. An energy-to-failure test similar to the Charpy test was found to be the most discriminating.

Descriptors:

• *STRESS ANALYSIS
• *FRACTURE(MECHANICS)
• *ALUMINUM ALLOYS
• *PROJECTILES
• SPECIFICATIONS
• MATERIALS
• FIRING TESTS(ORDNANCE)
• FINITE ELEMENT ANALYSIS
• LOADS(FORCES)
• FAILURE
• TEST METHODS
• REDUCTION
• MECHANICS
• THREE DIMENSIONAL
• SPINNING(MOTION)
• GUNS
• INERTIA
• MECHANICAL PROPERTIES
• CHARPY IMPACT TESTS
• TEST AND EVALUATION
• STRESSES

Subject Categories:

• Properties of Metals and Alloys
• Ammunition and Explosives

Distribution Statement:

APPROVED FOR PUBLIC RELEASE