Title

Development of a Small Soil Strain Gage

Creator

Truesdale, W. B.

Date

1963

Identifier

AD0402706

AD0402706

Abstract

A small strain gage was developed for the measurement of static and dynamic strains when em bedded in soil samples. The gage itself consists of two sets of two coil discs; associated instrumentation includes electronic driving, amplifying, and recording circuitry. One set of coils is embedded in soil as the strain sensing element; the other is externally positioned to serve as a reference. The principle of operation is that of an air core differential transformer with a null balancing system to permit accurate measurements of small strains. The gage is a reliable precision measuring device. Results of static and dynamic evaluations prove that the coils can be consistently placed in soil specimens within the spacing and alignment requirements. Thus, the gage accurately defines the relative position of two points in the soil and accurately measures the change in spacing of these points when the specimen is strained.

Date Issued

1963-03

Extent

68

Corporate Author

Armour Research Foundation

Report Number

AFSWC-TDR-63-3

AD Number

AD-402 706

Contract

AF29 601 5343

DoD Project

1080

DoD Task

108006

Distribution Conflict

No

Index In

U.S. Government Research Reports, Vol. 38, No. 15, p. 4

Index Price

$7.60

Distribution Classification

1

DTIC Record Exists

Yes

Report Availability

Not available via Contrails

Type

report