국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	A NEW CORRECTION TECHNIQUE FOR STRAIN-GAGE MEASUREMENTS ACQUIRED INTRANSIENT-TEMPERATURE ENVIRONMENTS
저자	W. Lance Richards
Keyword	Apparent strain; Measurement errors; Strain gage instrumentation; Structural testing
URL	http://www.dfrc.nasa.gov/DTRS/1996/PDF/H-2043.pdf
보고서번호	NASA-TP-3593
발행년도	1996
출처	NASA Dryden Flight Research Center
ABSTRACT	Significant strain-gage errors may exist in measurements acquired in transient-temperature environments if conventional correction methods are applied. As heating or cooling rates increase, temperature gradients between the strain-gage sensor and substrate surface increase proportionally. These temperature gradients introduce strain-measurement errors that are currently neglected in both conventional strain-correction theory and practice. Therefore, the conventional correction theory has been modified to account for these errors. A new experimental method has been developed to correct strain-gage measurements acquired in environments experiencing significant temperature transients. The new correction technique has been demonstrated through a series of tests in which strain measurements were acquired for temperature-rise rates ranging from 1 to greater than 100 degrees F/sec. Strain-gage data from these tests have been corrected with both the new and conventional methods and then compared with an analysis. Results show that, for temperature-rise rates greater than 10 degrees F/sec, the strain measurements corrected with the conventional technique produced strain errors that deviated from analysis by as much as 45 percent, whereas results corrected with the new technique were in good agreement with analytical results.