Accession Number : AD0820672

Title :   EVALUATION OF SOIL STRAIN GAGE INSTRUMENTATION.

Descriptive Note : Technical rept. Jun 65-Feb 67,

Corporate Author : NEW MEXICO UNIV ALBUQUERQUE ERIC H WANG CIVIL ENGINEERING RESEARCH FACILITY

Personal Author(s) : Hicks, Clair W. ; Janza, Frank J. ; Reid, Wilson G.

Report Date : AUG 1967

Pagination or Media Count : 108

Abstract : A soil strain gage instrumentation system, developed by the Illinois Institute of Technology Research Institute (IITRI) for the Air Force Weapons Laboratory, having the unique feature of no support column between the strain sensing elements was evaluated dynamically in soil loaded with a nominal 100- or 1,000-psi shock-wave pressure pulse. The average dynamic calibration in Ottawa sand at 100 psi was within 10 percent of the average static calibration. To further establish the characteristics of the strain gage, static tests conducted by IITRI were repeated at CERF. The repeatability of measurements is indicated by standard deviations around 25 percent. It was demonstrated that multigage arrangements are feasible for laboratory and field applications. The beginning of the strain-time traces usually contained a spurious spike, which could not be attributed to actual strain information. The results of a series of tests now indicate that the spiking is probably due to noise generated by the shock in the cable connectors. (Author)

Descriptors :   (*STRAIN GAGES, INSTRUMENTATION), (*SOIL MECHANICS, STRAIN GAGES), MODEL TESTS, DETECTORS, ELECTRIC CABLES, CALIBRATION, PERFORMANCE(ENGINEERING), REMOTE CONTROL, SHOCK WAVES, LOADS(FORCES), SENSITIVITY, TEST METHODS.

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE