Statistical analysis of Truncated-Data Method to Shorten Thermal-Aging Tests of Electrical Insulation
NAVAL RESEARCH LAB WASHINGTON DC
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The standard tests of insulation materials motorette tests and magnet-wire twist tests call for aging ten specimens until failure at each of three or four temperatures to obtain a life-versus-temperature curve. Valuable time could be saved if an estimate of the life at each temperature is valid from data truncated at fewer than all ten failures. Therefore a statistical analysis was made, using 50 previous thermal evaluations, of the validity of three truncated-data estimates of the life at each temperature the log average of the times for the fifth and sixth failures method A, an estimate from a probability-plot fit to the first five failure times method B, and simply the fifth failure time method C.
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