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Title: Effect of Fragile Speckle Patterns on Accuracy of Digital Volume Correlation

Abstract

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.

Authors:
ORCiD logo [1];  [2];  [2];  [1]
  1. Univ. of Virginia, Charlottesville, VA (United States)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1529293
Report Number(s):
SAND-2018-10172J
Journal ID: ISSN 0014-4851; 667937
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Experimental Mechanics
Additional Journal Information:
Journal Volume: 59; Journal Issue: 7; Journal ID: ISSN 0014-4851
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Digital volume correlation; Error assessment; Syntactic foams; Decorrelation; Speckle pattern

Citation Formats

Croom, Brendan P., Jin, Huiqing, Mills, Bernice E., and Li, Xiaodong. Effect of Fragile Speckle Patterns on Accuracy of Digital Volume Correlation. United States: N. p., 2019. Web. doi:10.1007/s11340-019-00512-4.
Croom, Brendan P., Jin, Huiqing, Mills, Bernice E., & Li, Xiaodong. Effect of Fragile Speckle Patterns on Accuracy of Digital Volume Correlation. United States. doi:10.1007/s11340-019-00512-4.
Croom, Brendan P., Jin, Huiqing, Mills, Bernice E., and Li, Xiaodong. Tue . "Effect of Fragile Speckle Patterns on Accuracy of Digital Volume Correlation". United States. doi:10.1007/s11340-019-00512-4.
@article{osti_1529293,
title = {Effect of Fragile Speckle Patterns on Accuracy of Digital Volume Correlation},
author = {Croom, Brendan P. and Jin, Huiqing and Mills, Bernice E. and Li, Xiaodong},
abstractNote = {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.},
doi = {10.1007/s11340-019-00512-4},
journal = {Experimental Mechanics},
number = 7,
volume = 59,
place = {United States},
year = {2019},
month = {4}
}

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