Accession Number:

ADA242549

Title:

Split-Hopkinson Pressure Bar Tests

Descriptive Note:

Final rept. Oct 86-Sep 88,

Corporate Author:

AIR FORCE ENGINEERING AND SERVICES CENTER TYNDALL AFB FL ENGINEERING AND SERVICES LAB

Personal Author(s):

Report Date:

1989-03-01

Pagination or Media Count:

88.0

Abstract:

This report summarizes work conducted on the split-Hopkinson pressure bar SHPB. The SHPB was modified to permit both tensile and compressive testing on cementitious materials. Direct tension tests were performed on concrete by cementing the specimen to the SHPB. Splitting cylinder tests were also conducted in the SHPB. Tensile strength data versus strain rate is presented for concrete. The strain rate sensitivity of tensile data appears to be two to four times greater than the compressive data for the same strain rate. Tests on dry and moist soils were also conducted in the SHPB. For these tests the loading pulse time is much smaller than the transit time of the specimen. Both wave speed and stress transmissibility through the specimen were monitored. Although not completely conclusive effects of compaction with moisture may cause large increases in wave speed transmissibility, and stiffness in sandy soils, at low values of moisture content. These results show the importance of needed research in the area of stress transmission in partially saturated soils.

Subject Categories:

  • Soil Mechanics
  • Ceramics, Refractories and Glass
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE