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In 1990, Japan established the industrial standard “Standard Specimens for Charpy Impact Testing Machines” and revised “Charpy Impact Testing Machines”. Before establishing these standards, the Iron and Steel Institute of Japan had studied the standardization of the reference test pieces and the reference testing machines. Reference test pieces for two energy levels (30 J and 100 J) are available, with a coefficient of variation within a lot of less than 4%.
Furthermore, the effect of non-uniformity of reference test pieces within a lot in the indirect verification have been examined. The verification test accuracy (estimation of the error and repeatability) is limited by the non-uniformity of test pieces within a lot.
reference test piece, uniformity, reference testing machine, indirect verification, error, repeatability, reproducibility
Technical Adviser, Mitutoyo Corporation, Kawasaki,