Accession Number:

AD0780612

Title:

Hard-Body Impact Damage Effects on Boron-Aluminum Composites.

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s):

• Carlisle,John G.

Report Date:

1974-03-01

Pagination or Media Count:

106.0

Abstract:

The investigation was conducted to study the effects of foreign object damage on the residual tensile and tensile fatigue strength of a composite material, unidirectional boron-aluminum-6061. Curves were generated for various levels of tensile prestress during the ballistic impaction which related velocity of impact with the residual tensile strength of the specimens. The composite material was further characterized by tensile fatigue tests, radiography, and photography. A similar damage and fatigue analysis was done for Ti-6Al-4V to provide baseline data with which to compare the composite. All tests were carried out in lab air and at room temperature. It was concluded that for a given level of impact damage BAl-6061 suffers much greater total loss and percentage loss of residual tensile strength than does Ti-6-4. Also, a fracture mechanics model fits the failure stress versus crack length data for BAl-6061 resulting from hard-body impact. Author

Descriptors:

• *Fiber reinforced composites
• Boron
• Aluminum alloys
• Damage
• Impact
• Impact tests
• Fatigue(Mechanics)
• Tensile strength
• Fracture(Mechanics)
• Theses
• Titanium alloys
• Vanadium alloys

Subject Categories:

• Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE