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By A. W. Hendry

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Extra resources for Elements of Experimental Stress Analysis. Structures and Solid Body Mechanics Division

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Simple dynamic strain measuring circuit. 40 ELEMENTS OF EXPERIMENTAL STRESS ANALYSIS is not necessary and it is sufficient to measure the variation of the voltage drop across the strain gauge which is of course directly proportional to the change of resistance. The signal from the gauge can be observed or recorded on a cathode ray oscilloscope, the steady component of the voltage drop being blocked off by a condenser. c. c. amplifier and a recorder or oscilloscope. It is essential that the frequency response of the amplifier should be wide enough to deal with the gauge signal.

Exp. Stress Anal, 1 (1), 110-115 (1943). 8. H. C. ROBERTS, Electric gauging methods: Their selection and application, Proc. Soc. Exp. Stress Anal, 2 (2), 95-105 (1944). 9. L. M BALL, Strain gauge technique, Proc. Soc. Exp. Stress Anal, 3 (1), 1-22 (1945). 10. G. P. TSCHEBATORIOFF, Use of electric resistivity gauges over long periods of time, Proc. Soc. Exp. Stress Anal, 3 (2), 47-52 (1945). 11. E. L. KIMBLE, A method of effecting SR-4 strain gauge operation under water, Proc. Soc. Exp. Stress Anal, 3 (2), 53-54 (1945).

C. EVANS, Pneumatic gauging techniques, Research, 11, 90-97 (1958). P. WIKNAMARATNA, A new earth pressure cell, Proc. 5th Int. Conf. , pp. 509-512. K. F. SMITH, Types of strain measuring devices and their range of utility, Product Engineering, 18 (1) (1947). K. SWATNGER and J. TWYMAN, An optical rectangular rosette extensometer for large strains, /. Sei. , 25 (6), 187-9 (1948). IV THE ELECTRICAL RESISTANCE STRAIN GAUGE THE principle of the electrical resistance strain gauge was discovered by Lord Kelvin when he observed that the resistance of a wire alters when it is subjected to stress.

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