| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily determine the yield stress of a sample, in a short time. Ž<P>SOLUTION: The yield stress determination method comprises: forming an indentation on the sample, by pressing-in a pillar-shaped indenter into the sample by applying an increasing load and then applying a decreasing load to the indenter not to press-in the indenter; acquiring data of the indenter load-indentation depth at this time; determining an inflection point stress σ<SB>i</SB>, by calculating the pressing load at the inflection point on a pressing load-indentation depth characteristic line obtained from the pressing load-indentation depth data; and determining the target yield stress of the sample, by calculating stress σ<SB>y</SB>which is represented by equation: σ<SB>y</SB>=a×σ<SB>i</SB>-b (where a=7.9 to 8.3, and b=260 to 310), using the inflection point stress σ<SB>i</SB>. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
|
