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A laboratory program was conducted to study the performance of small diaphragm and barium titanate pressure gages. The gages were embedded in cylinders of urethane rubber and of clay and were subjected to both static and dynamic loadings. The static loads were applied by means of a standard testing machine. The dynamic loads were applied and measured by means of a ballistic pendulum system.
The results of the investigation show that both types of gages have a higher response to a given applied stress when they are embedded than when they are in air. The embedded gage response of a diaphragm-type gage to a dynamic compressive stress is higher than the embedded gage response to an equivalent static compressive stress. The per cent increase in response depends upon the gage type and the material properties of the medium in which it is embedded. It was also established in the program that embedded gages respond only to the normal component of stress acting on their sensitive face.
Durelli, A J
Professor in Civil Engineering, Illinois Institute of Technology, Chicago, Illinois
Riley, W F
Senior Research Engineer, Mechanics Research Division, Armour Research Foundation, Chicago, Illinois