Accession Number:

ADA172080

Title:

Pressure Waves in Soils Using a Split-Hopkinson Pressure Bar

Descriptive Note:

Final rept. Apr 1984-Feb 1986

Corporate Author:

SOUTHWEST RESEARCH INST SAN ANTONIO TX

Personal Author(s):

• Ross, C. A.
• Nash, Phillip T.
• Friesenhahn, Gerard J.

Report Date:

1986-07-01

Pagination or Media Count:

94.0

Abstract:

Soil specimen lengths of 2.0, 4.0 and 6.0 inches were tested in a split Hopkinson pressure bar SHPB to determine effects of grain size, moisture content, confining pressure, and specimen length on material dampg, wave speed and transmissibility. For these SHPB tests the soil specimen length was long compared to the pulse length of the loading pulse. Three different grain sizes were tested for determination of dampingattenuation coefficients. A medium to fine sandy soil was tested both statically and dynamically for effects of moisture content, and compaction energy. The main conclusion is that the split- Hopkinson pressure bar can be used to obtain meaningful data on soil properties at intermediate strain rates. Considerable scatter is also present in the laboratory data. If further soil tests at intermediate strain rates are desired then the SHPB should be modified to accommodate a triaxial test call.

Descriptors:

• *SAND
• *SOIL DYNAMICS
• *IMPULSE LOADING
• VELOCITY
• STRESS STRAIN RELATIONS
• DAMPING
• GRAIN SIZE
• REFLECTION
• MOISTURE CONTENT
• PRESSURE MEASUREMENT
• STRAIN RATE
• WAVE PROPAGATION
• COEFFICIENTS
• STRAIN GAGES
• ATTENUATION
• REFRACTION
• ANGLE OF INCIDENCE
• SOIL TESTS
• STRESS WAVES
• COMPRESSIVE PROPERTIES
• MECHANICAL WAVES
• PIEZOELECTRIC GAGES

Subject Categories:

• Soil Mechanics
• Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE