Advancements in Optical Methods & Digital Image Correlation in Experimental Mechanics, Volume 3 by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9783030300098
Publisher: Springer International Publishing

Keywords

CorrelationFIB-SEM SEM-FEGKinematic fieldScanning electron microscopy Digital image correlation SpeckleDIC-HDIC

Introduction

The complete quantitative characterization of the material behavior at small-scales has recently been done to investigate nanoscale spatial resolution by combining scanning electron microscopy (SEM) and digital image correlation (DIC) [1–3]. This association, called (SEM-DIC) is an emerging and powerful technique used to study microscopic phenomena in a wide range of materials [4–6].

The first difficulty is linked to the SEM and the problem of image stability and distortion [7]. In contrast to the proven performance of the DIC methods using optical images, SEM-DIC suffers of lakes directly associated to instability and distortion of this tools.

The second difficulty, which is the same as in optical condition, is to correctly observe and separate strain localization and fracture developments. Using conventional DIC in optical condition, some works have been conducted on materials with developed cracks, but it is always difficult to localize cracks and to measure accurately strain fields in a same region. As the conventional DIC was developed on the basis of continuum mechanics, this method is clearly not adapted to the observation of cracked materials. Recently, a global approach gave interesting results [8], but this method supposes knowing the crack position before the image analysis. A more recent work proposed a local approach, adding a specific enrichment of the kinematical field, taking into account the presence of cracks (Heaviside-DIC) [9, 10]. This method has the advantage of analysing images without knowing the crack positions. As the proposed enrichment of this method is added to a classical kinematical field using first gradients of displacement, it can be possible to separate strains from cracks.

The aim of the proposed paper is to: Define the process of marking and imaging using Focused Ion Beam (FIB) and SEM equipment, and then analyze displacement measurement performances.

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