Accession Number : AD0453872


Title :   A HALF-BRIDGE TYPE STRAIN GAGE FOR USE AT ELEVATED TEMPERATURES


Descriptive Note : Technical documentary rept.


Corporate Author : HIGH TEMPERATURE INSTRUMENTS ENGINEERING CORP BALA CYNWYD PA


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/453872.pdf


Report Date : Oct 1964


Pagination or Media Count : 155


Abstract : Development of the Half-Bridge strain gage is continued. Gage manufacturing and testing techniques were standardized. A theoretical analysis of gage performance is included. The following tests were made: (1) response of gages to rapid radiant heating; (2) measurement of gage factor at room temperature and as a function of temperature; (3) response of gages to slow (oven) heating; (4) gage drift at constant temperature. It is shown that: (1) gage performance depends strongly on bridge voltage; (2) the gage material selected on the basis of previous tests (Nichrome) is not fully acceptable for gage use, even in the Half-Bridge configuration, because of a metallurgical transition occurring above 1000 F; (3) the poorest Nichrome Half-Bridge strain gages tested exhibited a temperature coefficient of less than 3 microohms/ohm/F to 1000 F, more than an order of magnitude better than currently available uncompensated high temperature gages; (4) gage use above 1500 F is not generally feasible because of a lack of adequate cements and bonding techniques at these temperatures.


Descriptors :   *STRAIN GAGES , TEMPERATURE , PERFORMANCE(ENGINEERING) , MATERIALS , HIGH TEMPERATURE , NICKEL ALLOY INCONEL , ELECTRIC BRIDGES , CHROMIUM ALLOYS , NICKEL ALLOYS , SENSITIVITY , THERMAL EXPANSION , HEATING


Subject Categories : Test Facilities, Equipment and Methods


Distribution Statement : APPROVED FOR PUBLIC RELEASE