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Title: DEVELOPMENT OF RESISTANCE STRAIN GAGES USABLE UP TO 1600 F

Abstract

Results of work on the development and testing of an electrical strain gage usable up to 1600 deg F are summa rized. An evaluation was made of two alloys in the system Fe-Cr-Al, Alloy B (Fe-25 Cr-7 1/2 Al) and Alloy D (Fe-20 Cr- 10 Al). The alloys were reduced to 0.001inch diameter wires suitable for strain sensitivity determinations and resistance stability tests. Gages of both Alloys B and D were tested in a grid configuration on base materials of Type 302 stainless steel (18-8), Titanium Alloy C 110M and Udimet 500 Alloy. Test temperatures up to 1400 deg F were investigated, and strain values up to approximately 2200 microin/in. were used. Comparable gage factors were found for both alloys, approximately 2.0, and the effect of temperature or strain level, in the range studied, appeared to be small. Gage factors were determined by a static method with rapid unloading. Desistance instability (drift) was noted for both Alloys B and D when subjected to slow thermal cycles to 1600 deg F and cooled to room temperature. Also, both alloys showed a negative temperature coefficient of resistivity, in the temperature range 70 to 1800 deg F; Alloy D showed a value of-11.0more » x 10/sup -5/ and Alloy B --6.1 x 10/sup -5/ deg C. The magnitude of the temperature-induced drift in resistance was found to be a function of the wire size, being smallest for the largest wire size studied (0.002-inch diameter). Much lower rates of drift are exhibited at elevated temperatures. The rates between 1200 and 1600 deg F were roughly one tenth those at room temperature, but were still of a magnitude to preclude accurate static determinations. (auth)« less

Authors:
;
Publication Date:
Research Org.:
Illinois Inst. of Tech., Chicago. Armour Research Foundation
OSTI Identifier:
4804212
Report Number(s):
NAMC-ASL-1050(Pt.II)
NSA Number:
NSA-16-025559
DOE Contract Number:  
N156S-32317
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-62
Country of Publication:
United States
Language:
English
Subject:
ENGINEERING AND EQUIPMENT; ALUMINUM ALLOYS; CHROMIUM ALLOYS; DEFORMATION; ELECTRIC CONDUCTIVITY; GAGES; HEAT TREATMENTS; IRON ALLOYS; RESISTORS; SENSITIVITY; STABILITY; STAINLESS STEELS; STRAIN GAGES; TEMPERATURE; TESTING; TITANIUM ALLOYS; WIRES

Citation Formats

Graft, W H, and Colner, W H. DEVELOPMENT OF RESISTANCE STRAIN GAGES USABLE UP TO 1600 F. United States: N. p., 1957. Web.
Graft, W H, & Colner, W H. DEVELOPMENT OF RESISTANCE STRAIN GAGES USABLE UP TO 1600 F. United States.
Graft, W H, and Colner, W H. Sun . "DEVELOPMENT OF RESISTANCE STRAIN GAGES USABLE UP TO 1600 F". United States.
@article{osti_4804212,
title = {DEVELOPMENT OF RESISTANCE STRAIN GAGES USABLE UP TO 1600 F},
author = {Graft, W H and Colner, W H},
abstractNote = {Results of work on the development and testing of an electrical strain gage usable up to 1600 deg F are summa rized. An evaluation was made of two alloys in the system Fe-Cr-Al, Alloy B (Fe-25 Cr-7 1/2 Al) and Alloy D (Fe-20 Cr- 10 Al). The alloys were reduced to 0.001inch diameter wires suitable for strain sensitivity determinations and resistance stability tests. Gages of both Alloys B and D were tested in a grid configuration on base materials of Type 302 stainless steel (18-8), Titanium Alloy C 110M and Udimet 500 Alloy. Test temperatures up to 1400 deg F were investigated, and strain values up to approximately 2200 microin/in. were used. Comparable gage factors were found for both alloys, approximately 2.0, and the effect of temperature or strain level, in the range studied, appeared to be small. Gage factors were determined by a static method with rapid unloading. Desistance instability (drift) was noted for both Alloys B and D when subjected to slow thermal cycles to 1600 deg F and cooled to room temperature. Also, both alloys showed a negative temperature coefficient of resistivity, in the temperature range 70 to 1800 deg F; Alloy D showed a value of-11.0 x 10/sup -5/ and Alloy B --6.1 x 10/sup -5/ deg C. The magnitude of the temperature-induced drift in resistance was found to be a function of the wire size, being smallest for the largest wire size studied (0.002-inch diameter). Much lower rates of drift are exhibited at elevated temperatures. The rates between 1200 and 1600 deg F were roughly one tenth those at room temperature, but were still of a magnitude to preclude accurate static determinations. (auth)},
doi = {},
url = {https://www.osti.gov/biblio/4804212}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1957},
month = {12}
}

Technical Report:
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