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> Micro measurements fwa-05 -s/n- fatigue life gages nos
Micro measurements fwa-05 -s/n- fatigue life gages nos
Below is an article I found on line about these gages.
Title : THE S/N FATIGUE LIFE GAGE: 1ST EDITION.
Corporate Author : MICRO-MEASUREMENTS INC ROMULUS MICH
Pagination or Media Count : 45
Abstract : The -S/N- Fatigue Life Gage is a small, bondable resistance sensor similar in appearance to a foil strain gage. When installed on critical areas of a structural component which is subjected to fatigue loading, the fatigue life gage generates a permanent resistance change as a continuous function of fatigue experience. Even when caused by a completely random program of load cycles, the resistance change accumulates as a function of actual structural fatigue damage over a wide spectrum of operating conditions. Unlike other resistance-changing sensors such as strain gages and resistance thermometers, the fatigue life gage need not be connected to read-out instrumentation while it is operating, but may be interrogated periodically using a suitable resistance measuring device which is connected to the gage only long enough to indicate or record gage resistance. In many cases, the resistance change is large enough to permit use of simple and inexpensive read-out instruments of the ohmmeter or wheatstone bridge type. Typical values for Delta R at the end of specimen life are 4 to 8 ohms for a 100 ohm sensor. (Author)
