Measurement errors associated with the transient heating of electrical-resistance strain gages

摘要

Significant strain-gage errors may exist in measurements acquired in transient temperature environments if conventional correction methods are applied. Conventional correction theory was modified and a new experimental method was developed to correct indicated straind ata for errors created in radiant heating environments ranging from 0.6 deg C/sec (1 deg F/sec) to over 56 deg C/sec (100 deg F/sec). In some cases the new and conventional methods differed by as much as 30 percent. Experimental and analytical results were compared to demonstrate the new technique. For heating conditions greater than 6 deg C/sec (10 deg C/sec), the indicated strain data corrected with the developed technique compared much better to analysis than the same data corrected with the conventional technique.