Brinell Sandwich Transducer.
DEPARTMENT OF THE ARMY WASHINGTON D C
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The instant Brinell sandwich transducer has a layer of small hardened steel balls between two layers of softer materials. The balls may be closely packed or separated into a less dense array by a spacer. Indentations in the softer materials indicate the maximum compressive forces that have been applied to the balls. The diameters of identations in a sampling pattern are measured by a microscope since such diameters indicate the magnitude of the forces which have been registered by the transducer. Good resolution over a range of more than a factor of 100 has been obtained. With pulses ranging from static to approximately half-sines with rise times of 0.1 millisecond and a fall time of 0.1 millisecond, rate effects have been insignificant. That is, the indicated gauge pressure is not sensitive to the rate at which the pressure is applied for a broad range of pulse rise times and durations. Also, these guages incorporate high axial stiffness and flat geometry. Author
- Test Facilities, Equipment and Methods