Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Effect of Fragile Speckle Patterns on Accuracy of Digital Volume Correlation

Journal Article · · Experimental Mechanics
 [1];  [2];  [2];  [1]
  1. Univ. of Virginia, Charlottesville, VA (United States)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Due to challenges in generating high-quality 3D speckle patterns for Digital Volume Correlation (DVC) strain measurements, DVC experiments often utilize the intrinsic texture and contrast of composite microstructures. One common deficiency of these natural speckle patterns is their poor durability under large deformations, which can lead to decorrelation and inaccurate strain measurements. Using syntactic foams as a model material, the effects of speckle pattern degradation on the accuracy of DVC displacement and strain measurements are assessed with both experimentally-acquired and numerically-generated images. It is shown that measurement error can be classified into two regimes as a function of the percentage of markers that have disappeared from the speckle pattern. For minor levels of damage beneath a critical level of damage, displacement and strain error remained near the noise floor of less than 0.05 voxels and 100 με, respectively; above this level, error rapidly increased to unacceptable levels above 0.2 voxels and 10,000 με. This transition occurred after 30%–40% of the speckles disappeared, depending on characteristics of the speckle pattern and its degradation mechanisms. Furthermore, these results suggest that accurate DVC measurements can be obtained in many types of fragile materials despite severe damage to the speckle pattern.
Research Organization:
Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1529293
Report Number(s):
SAND--2018-10172J; 667937
Journal Information:
Experimental Mechanics, Journal Name: Experimental Mechanics Journal Issue: 7 Vol. 59; ISSN 0014-4851
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

References (38)

Digital volume correlation: Three-dimensional strain mapping using X-ray tomography journal September 1999
Damage measurements via DIC journal February 2015
In situ X-ray synchrotron tomographic imaging during the compression of hyper-elastic polymeric materials journal September 2015
Analysis and Artifact Correction for Volume Correlation Measurements Using Tomographic Images from a Laboratory X-ray Source journal August 2010
Internal Deformation Measurement of Polymer Bonded Sugar in Compression by Digital Volume Correlation of In-situ Tomography journal February 2014
Unveiling 3D Deformations in Polymer Composites by Coupled Micro X-Ray Computed Tomography and Volumetric Digital Image Correlation journal February 2016
A Review of Speckle Pattern Fabrication and Assessment for Digital Image Correlation journal May 2017
A q-Factor-Based Digital Image Correlation Algorithm (qDIC) for Resolving Finite Deformations with Degenerate Speckle Patterns journal March 2018
New Development of Digital Volume Correlation for the Study of Fractured Materials journal July 2018
Determination of displacements using an improved digital correlation method journal August 1983
Synchrotron X-ray characterization of crack strain fields in polygranular graphite journal November 2017
Three dimensional experimental and numerical multiscale analysis of a fatigue crack journal April 2010
Experimental study of the compression behaviour of syntactic foams by in situ X-ray tomography journal March 2007
In situ observation of syntactic foams under hydrostatic pressure using X-ray tomography journal June 2013
Damage investigation and modeling of 3D woven ceramic matrix composites from X-ray tomography in-situ tensile tests journal November 2017
Synchrotron X-ray characterization of crack strain fields in polygranular graphite journal November 2017
Three dimensional experimental and numerical multiscale analysis of a fatigue crack journal April 2010
Three-dimensional image correlation from X-ray computed tomography of solid foam journal August 2008
Particle clustering effects on damage mechanisms in elastomeric syntactic foams journal October 2019
Damage mechanisms in elastomeric foam composites: Multiscale X-ray computed tomography and finite element analyses journal January 2019
Observation and simulation of indentation damage in a SiC–SiCfibre ceramic matrix composite journal March 2016
A three-dimensional digital image correlation technique for strain measurements in microstructures journal September 2004
In situ observation of mechanical damage within a SiC-SiC ceramic matrix composite journal December 2016
Effects of particle clustering on the tensile properties and failure mechanisms of hollow spheres filled syntactic foams: A numerical investigation by microstructure based modeling journal May 2013
A functionally graded syntactic foam material for high energy absorption under compression journal February 2007
Analysis of particle-to-particle elastic interactions in syntactic foams journal December 2011
Analysis of compaction in brittle foam with multiscale indentation tests journal March 2018
Incremental calculation for large deformation measurement using reliability-guided digital image correlation journal April 2012
Gaussian pre-filtering for uncertainty minimization in digital image correlation using numerically-designed speckle patterns journal March 2015
Quantifying the three-dimensional damage and stress redistribution mechanisms of braided SiC/SiC composites by in situ volumetric digital image correlation journal March 2017
Dimensional Quantification of Embedded Voids or Objects in Three Dimensions Using X-Ray Tomography journal February 2012
Two-dimensional digital image correlation for in-plane displacement and strain measurement: a review journal April 2009
3D deformation and strain analysis in compacted sugar using x-ray microtomography and digital volume correlation journal July 2009
Comparison of the Mechanical Behaviour of Standard and Auxetic Foams by X-ray Computed Tomography and Digital Volume Correlation: Mechanical Behaviour of Foams by X-ray Tomography and Digital Volume Correlation journal September 2013
Digital Volume Correlation Applied to X-ray Tomography Images from Spherical Indentation Tests on Lightweight Gypsum: Integrated Digital Volume Correlation Based on Numerical Fields journal August 2014
Methods and applications of digital volume correlation journal August 2008
Study on subset size selection in digital image correlation for speckle patterns journal January 2008
Discrete and continuum analysis of localised deformation in sand using X-ray μCT and volumetric digital image correlation journal May 2010

Cited By (1)

X-Ray Stereo Digital Image Correlation journal August 2019