SEDL / STP / STP1248-EB / STP14663S

Production of Charpy Impact Verification Specimens and Verification of Machine Performance

Hida, N
Technical Adviser, Mitutoyo Corporation, Kawasaki,
A member of the National Committee, “Mechanical Testing of Metallic Materials” under The Iron and Steel Institute of Japan,

Pages: 11    Published: Jan 1995

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Abstract

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.