4.5 Article

Time-Resolved Digital Image Correlation in the Scanning Electron Microscope for Analysis of Time-Dependent Mechanisms

期刊

EXPERIMENTAL MECHANICS
卷 61, 期 2, 页码 331-348

出版社

SPRINGER
DOI: 10.1007/s11340-020-00632-2

关键词

High resolution digital image correlation; Heaviside-DIC; Polycrystalline materials; Scanning electron microscopy digital image correlation; Strain localization; Real-time DIC; Strain relaxation; Time-resolved DIC measurements; SEM measurement variability and sensitivity

资金

  1. ONR [N00014-19-1-2129]
  2. U.S. Naval Research Laboratory under Office of Naval Research

向作者/读者索取更多资源

This study developed a methodology for conducting time-resolved digital image correlation in the SEM to analyze time-dependent mechanical deformation phenomena. Experimental investigation of microscope and electron beam scanning parameters that influence the rate at which time-resolved DIC information is mapped was conducted, and time-resolved DIC imaging was successfully demonstrated on a Ti-7Al alloy.
Background:Advancements in the Digitial Image Correlation (DIC) technique over the past decade have greatly improved spatial resolution. However, many processes, such as plastic deformation, have a temporal component spanning from fractions of a second to minutes that has not yet been addressed in detail, particularly for DIC conducted in-situ in the scanning electron microscope (SEM).Objective:To develop a methodology for conducting time-resolved digital image correlation in the SEM for analysis of time-dependent mechanical deformation phenomena. Methods: Microscope and electron beam scanning parameters that influence the rate at which time-resolved DIC information is mapped are experimentally investigated, providing a guide for use over a range of timescales and resolutions.Results:Time-resolved DIC imaging is demonstrated on a Ti-7Al alloy, where slip band propagation is resolved with imaging dwell times of seconds. The limits of strain resolution and strain collection speeds are analyzed.Conclusions:The new developed methodology can be applied to a wide range of materials loaded in-situ to quantify time-dependent plastic deformation phenomena.

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