期刊
JOURNAL OF MATERIALS RESEARCH
卷 35, 期 8, 页码 1028-1036出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1557/jmr.2019.416
关键词
nanoindentation; simulation; strength
Pop-in during indentation testing is a term used to indicate the sudden displacement burst during loading. Experimental data are measured during an indentation pop-in event, using displacement sensors with 20 mu s time constant at 100 kHz data acquisition rate. The load-depth response during the pop-in event that occurs within 160 mu s is determined after accounting for the instruments' dynamic response. Unlike the response reported in the literature for force-controlled tests, wherein the load on the sample remains constant during the pop-in, a steep load drop is observed after the onset of pop-in, followed by a significant increase in the load well beyond the load at the onset of pop-in. A model for the material and instrument's dynamic response is presented that agrees well with the experimental observations. The implications of these findings for determination of pop-in length or velocity and for performing displacement-controlled testing involving closed loop control are discussed.
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