Abstract
The indentation test is a method to extract material plastic and elastic properties by pressing sharp indenter to the specimen. In this test, load and displacement are continuously recorded. In recent our studies, we can transform load-displacement curves into stress-strain curves. However, it is indicated by past research that if strain exceeds more than predefined strain (critical strain), the load-displacement curves are unlikely be affected. In this report, we examined how load-displacement curves are varied while increasing strain rate and relation between strain rate and critical strain by FE analysis. Finite element analysis is used and the analysis data is confirmed valid by comparing experimental result of the Indentation test. As a result, it turned out that higher strain rate become, the more load-displacement curves are affected and high strain area, which is located in direct beneath of the indenter have only little impact on load-displacement curves of the Indentation test.
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