Abstract
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.
Original language | English (US) |
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Pages (from-to) | 331-348 |
Number of pages | 18 |
Journal | Experimental Mechanics |
Volume | 61 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2021 |
Externally published | Yes |
Keywords
- Heaviside-DIC
- High resolution digital image correlation
- Polycrystalline materials
- Real-time DIC
- SEM measurement variability and sensitivity
- Scanning electron microscopy digital image correlation
- Strain localization
- Strain relaxation
- Time-resolved DIC measurements
ASJC Scopus subject areas
- Aerospace Engineering
- Mechanics of Materials
- Mechanical Engineering