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Pop-in Detection

By Hesam Askari1, Thomas Lambrosa2, Michael Maughan2

1. Washington State University 2. Purdue University

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Abstract

At a glance:
An algorithm to analyze and detect pop-ins in indentation data generated from .hys (Hysitron) files.

Nanoindentation in low dislocation materials often results in strain bursts, or pop-ins when dislocations are nucleated or the stress field grows to encounter a defect where slip is initiated. Pop-ins have traditionally been used to identify the transition from elastic to plastic behavior. However, pop-ins do often occur at depths greater than where this transition is reached. Identification of pop-ins has traditionally been performed by manual inspection of the load-displacement curve generated by the instrument. This is time-consuming if the desire is to quantify the load and number of pop-ins in many files.

This tool will detect pop-ins in multiple files within a directory and give a convenient text output of the results. It can run in two modes, 1) detecting only the first pop-in, and 2) detecting all pop-ins in a file. User customizable program inputs allow tunable definition of what constitutes pop-in. The program can be used to analyze the output from any nanoindenter if it is formatted correctly, but is optimized to analyze output in the format produced by the Hysitron Triboscan software.

Cite this work

Researchers should cite this work as follows:

  • Hesam Askari; Thomas Lambrosa; Michael Maughan (2014), "Pop-in Detection," http://nanohub.org/resources/20804.

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