Comparison and Analysis on Standards of Metal Material Rockwell Hardness Test in Civil Aircraft Maintenance Field

The Rockwell hardness test of metal material and material surface is very important for mechnical property test in civil aviation field.The two corresponding standards of ASTM E18-2014(established by American society for testing and materials) and domestic GB/T 230 were compared and analyzed in the following aspects:the specimen surface roughness,test procedure,test report,direct and indirect verification,test error,calibration of standard block and standard machine,and measurement uncertainty evaluation.Through the comparison and analysis,it was found that the requirements of GB standard were stricter in the aspects easy to control,including test force accuracy and cycle time,indirect verification cycle,demand of the specimen,indication error and indication repeatability of the hardness machine.The given parameter in GB standard was also more detailed so as for the tester to reference.However,ASTM standard was stricter in dwell time of test force,allowable error of indenter and total test force,and other aspects.