| 摘要 |
PCT No. PCT/EP91/01965 Sec. 371 Date Jun. 12, 1992 Sec. 102(e) Date Jun. 12, 1992 PCT Filed Oct. 16, 1991 PCT Pub. No. WO92/08119 PCT Pub. Date May 14, 1992.The hardness of a metal sample is determined using a hardness tester provided with an indenter having an indenting tip and means for loading the indenter. The method comprises employing an electrically conductive indenting tip and connecting the indenter and the metal sample to the input terminals of an electric resistance measuring apparatus. The indenter is loaded up to a preset load on a reference metal sample having a known hardness and detecting the contact resistance under the load. The tester is functionally set on a metal sample to be tested and gradually the indenter is loaded until the same electrical contact resistance as detected on the reference sample is measured by the electrical resistance measuring apparatus and the load which is actually applied to the indenter is read. The hardness of the tested sample is determined through a proportionality relationship between the preset load applied to the reference sample and the load applied to the tested sample.
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