A load cell for grain-propelled ballistic rocket thrust measurement

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De Lucena, Samuel E. [UNESP]
De Aquino, Marcelo G. S.
Caporalli-Filho, Angelo [UNESP]

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A 1000-kgf resistive strain-gauge load cell has been developed for quality testing of rocket propellant grain. A 7075-T6 aluminum alloy has been used for the elastic column, in which 8 uniaxial, 120-Ω strain gauges have been bonded and connected to form a full Wheatstone bridge to detect the strain. The chosen geometry makes the transducer insensitive to moments and, also, to the temperature. Experimental tests using a universal testing machine to imposed compression force to the load cell have demonstrated that its behavior is linear, with sensitivity of 2.90 μV/kgf ± 0.34%, and negligible hysteresis. The designed force transducer response to a dynamic test has been comparable to that of a commercial load cell. © 2005 IEEE.



Force measurement, Force transducer, Load cells, Load measurement, Rockets, Strain gauge, Thrust measurement, Force transducers, Universal testing machine, Aluminum alloys, Hysteresis, Military rockets, Propellants, Strain gages, Structural loads

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Conference Record - IEEE Instrumentation and Measurement Technology Conference, v. 3, p. 1767-1772.