Accession Number:

AD0838386

Title:

DETERMINATION OF SPALLATION THRESHOLDS BY EXPLODING FOIL TECHNIQUES

Descriptive Note:

Master's thesis,

Corporate Author:

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

Personal Author(s):

• Baca, Jose R.

Report Date:

1968-06-01

Pagination or Media Count:

99.0

Abstract:

Exploding foil techniques were used to accelerate a Mylar flyer at a controlled velocity to produce a plane, longitudinal shock wave in 6061-T6 aluminum, and the interaction of the wave with the target free surface was studied. Flyer velocity and planarity were determined by high-speed, photographic techniques. The spall threshold was determined as a function of flyer velocity and thickness. A criterion was formulated to predict the spall threshold. Microscopic analyses revealed the mechanism of incipient spall in 6061-T6 aluminum to be cracks which propagated from inclusions in the matrix material.

Descriptors:

• *ALUMINUM ALLOYS
• SHOCK(MECHANICS)
• THESES
• MICROSCOPY
• FRACTOGRAPHY
• SPALLATION
• IMPACT SHOCK
• ISOTROPISM
• PLASTIC PROPERTIES
• TRANSDUCERS
• METALLOGRAPHY
• SHOCK WAVES
• CRACK PROPAGATION

Subject Categories:

• Metallurgy and Metallography
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE