DVC analysis of a polymer material subjected to tensile loading with synchrotron radiation tomography. (January 2020)

• Record Type: Journal Article
• Authors: Lee, Sooyoung; Ji, Wooseok
• Is Part Of: Polymer testing. Volume 81(2020)
• Publication Date: 2020-01
• Subjects: Digital volume correlation -- Synchrotron radiation -- In situ testing -- Computed tomography -- Subsurface deformation; Polymers -- Testing -- Periodicals; Polymères -- Tests -- Périodiques; 620.1920287
• DOI: 10.1016/j.polymertesting.2019.106204
• Languages: English
• ISSNs: 0142-9418

Abstract

Abstract: Subsurface deformation behavior of a polymeric material is studied through the digital volume correlation (DVC) technique. Fundamental principles of the DVC technique are presented and the supplemental state-of-the-art algorithmic schemes to improve the efficiency and accuracy of the DVC analysis are also introduced. Tensile tests on an epoxy material are performed in conjunction with synchrotron radiation tomography. In order to create randomly distributed grayscale values in the tomograms for the following image analysis, microscale high-density particles are embedded when the epoxy specimens are fabricated. 3D tomographic images taken at multiple loading steps are utilized for the DVC analysis. The performance of the present DVC analysis is evaluated with the experimental data. Highlights: ● A comprehensive theoretical background and detailed numerical implementation of the digital volume correlation technique are presented. ● In situ mechanical testing procedure to obtain 3D volume images of a deforming material at multiple loading steps for DVC analysis is described in great detail. ● High-density microscale particles are embedded in the epoxy specimen during the fabrication process to create a variance of grayscale values in CT images for improved correlation performance. ● Resolution refinement technique has been implemented to enhance the correlation capability with submicron accuracy. ● It is demonstrated that the deformation behavior occurring inside an isotropic homogenous material can be quantified through the present DVC technique.