Indentation testing instrument and indentation testing method

Abstract

Disclosed an indentation testing instrument including: a loading lever supported pivotally; an indenter provided on the loading lever; an indenter linkage section; a loading lever driving section; a reference lever supported pivotally having a same shaft center as the loading lever; an indenter reference section provided on the reference lever as a positional reference of a tip portion of the indenter; an indenter position detection section; a reference lever driving section; a stopper to stop the reference lever; a specimen surface reference measurement member to turn the loading lever from the state that the indenter reference section touches the specimen surface, and to measure a first indentation depth amount; and a machine frame reference measurement member to turn the loading lever from the state that the reference lever touches the stopper and the indenter reference section is spaced apart from the specimen surface, and to measure a second indentation depth amount.

Description

technical field [0001] The invention relates to an indentation testing machine and an indentation testing method. Background technique [0002] Known as a material testing machine is an indentation tester which forms an indentation on the surface of a test piece by pressing an indenter shaft provided with an indenter on the tip into the surface of the test piece, thereby evaluating materials such as Mechanical properties such as hardness (for example, refer to Japanese Patent Laid-Open No. 2004-12178). [0003] For example, when the tip of the indenter is pressed into the surface of the test piece with a predetermined load, the indentation tester measures the indentation depth (displacement of the indenter) by means of a displacement meter, thereby evaluating the indentation based on the relationship between the displacement and the load. Mechanical properties such as hardness of the material. [0004] Since the indentation depth measured by the indentation tester includes...

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Problems solved by technology

[0005] However, for example, since the method introduced in ISO14577 is a modified method based on the principle that the compliance which is the reciprocal of the initial unloading slope and the reciprocal of the square root of the contact area calculated from the curve are expressed as a linear expression passing through the zero point, and the The method estimates the frame compliance based on the rigidity of the test piece obtained from the test results, so there is a problem that the correction value sometimes includes the error caused by the estimation method

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