Mechanical Testing and Evaluation
Gage Repeatability and Reproducibility in Hardness Testing
The gage repeatability and reproducibility (GRR) study is a procedure for determining the repeatability of a test instrument and the reproducibility of a specific gage in operation. This article reviews the general method of GRR studies and its application for indentation hardness testing. It describes a long method and a short method for evaluation of GRR. The article analyzes factors of hardness testing instruments and provides guidelines for hardness tests. It concludes with a list of suggestions that can improve hardness tests.
Edward L. Tobolski, Gage Repeatability and Reproducibility in Hardness Testing, Mechanical Testing and Evaluation, Vol 8, ASM Handbook, Edited By Howard Kuhn, Dana Medlin, ASM International, 2000, p 278–281, https://doi.org/10.31399/asm.hb.v08.a0003277
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