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Thursday, April 18, 2024

Inconsistency in Nanoindentation Testing Utilizing Berkovich Indenters


Nanoindentation testing is a high-precision instrumented indentation take a look at method that has the benefits of non-destructive testing and ease. Nonetheless, researchers discovered that when testing the identical pattern with totally different Berkovich indenters, inconsistency nonetheless arises even when the indenters are usually calibrated. This inconsistency poses challenges in precisely testing materials hardness and evaluating information from totally different laboratories.

Atomic pressure microscopy (AFM) peak contour map of a Berkovich indenter. (Picture by ZHANG Xianlong)

In a research printed in Journal of Supplies Analysis and Know-how, researchers from the Supplies Analysis Middle of the Institute of Fashionable Physics (IMP) of the Chinese language Academy of Sciences (CAS) reported that utilizing totally different Berkovich indenters for nanoindentation testing, excluding fused silica, yields inconsistent outcomes, and analyzed the explanations behind this inconsistency.

The researchers recognized two foremost components contributing to the inconsistent experimental outcomes, i.e., defects within the indenter tip and the indentation measurement impact. 
To quantify their impression on experimental outcomes, they developed a finite factor mannequin of the indenter utilizing the indenter space perform and proposed a technique to appropriate the indentation measurement impact on the load-displacement curve. 

The outcomes indicated that whereas defects within the indenter tip have a small direct impression on the experimental outcomes, they do have an effect on the outcomes not directly by influencing the indentation measurement impact.

The indentation measurement impact correction technique and indenter modeling strategy launched on this research are anticipated to be utilized in inverse finite factor evaluation to find out the constitutive relationship of the examined materials.

Supply: Chinese language Academy of Sciences

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