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Deformation Measuring System for Repetitively Loaded, Large Diameter Specimens of Granular Material
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1969-08-01
[PDF-2.24 MB]
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Abstract:This report describes the design and evaluation of a deformation measurement system developed to observe the vertical and horizontal displacements of points on the surface of large diameter cylindrical specimens of granular material subjected to rapid, repeated load applications. The system consists of a loading apparatus, triaxial cell, measurement transducers (including a newly developed optical tracker), and recording apparatuses. Because preliminary measurements made on specimens of granular materials were quite different than had been expected, a general evaluation of the system was undertaken. The evaluation was accomplished by loading 4-inch diameter by 8-inch-high Lexan plastic cylinders and comparing specimen deformations, as measured with the entire system, against strain gage indications. The system was found to give satisfactory agreement with the known and observable characteristics of the plastic material, and it was concluded that the system would provide useful and valid deformation data on specimens of granular material.
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