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Strain gauge measurement on plastics
Author(s) -
PROKOPEC M.
Publication year - 1974
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/j.1475-1305.1974.tb00075.x
Subject(s) - strain gauge , thermocouple , materials science , composite material , electrical resistance and conductance , gauge (firearms) , coating , foil method , voltage , ohm , signal (programming language) , epoxy , electrical engineering , metallurgy , engineering , computer science , programming language
A description is given of tests carried out to investigate the problem of signal instability encountered in the use of electrical resistance strain gauges on plastics. Time response from switch‐on is indicated for 120 ohm wire and foil gauges of various types and sizes, bonded to epoxy resin and energised at 25 V. Wire gauges show a reduction in signal and foil gauges an increase. Results of subsequent tests demonstrate the effects of initial strain, energising voltage, thermal diffusivity of the specimen material and gauge grid area. An indication of gauge surface temperature obtained by thermocouple, is related to degree of drift and energising voltage. Signal stability is improved by coating the gauge with a wax/aluminium‐powder mixture. A data logger with pulse excitation is recommended as the best system and limiting energising voltages are stated.