登入選單

返回Google圖書搜尋

Evaluation of Correction Methods for Determining Load-Independent Knoop Microhardness

CT. YoungSK. Rhee

出版	ASTM International, 1978
URL	http://books.google.com.hk/books?id=Czd7zgEACAAJ&hl=&source=gbs_api

註釋

The correction methods proposed in the literature for determining load-independent Knoop microhardness were surveyed. The methods were evaluated by using the results from seven samples and two testers. Adding a constant correction factor for each sample to the measured long diagonals to obtain the unrecovered diagonal lengths was found to be quite successful. The correction factor includes terms from elastic recovery, visibility error, and calibration error. This factor, when applied, corrects the elastic recovery in the diagonals and the systematic errors associated with the tester employed, and thus results in Knoop hardness numbers independent of load and tester, which can be taken as the true hardness. The correction factor is load-independent but varies with sample and tester.