Measurement of elastic properties of materials employing 3-D DIC in a Cornu's experiment. (31st December 2021)

• Record Type: Journal Article
• Authors: Swain, Digendranath; Thomas, Binu P; Karthigai Selvan, S; Philip, Jeby
• Is Part Of: Materials research express. Volume 8:Number 12(2021)
• Publication Date: 2021-12-31
• Subjects: Cornu's method -- 3-D Digital Image Correlation (3-D DIC) -- Elastic properties -- Poisson's ratio -- elastic modulus -- anticlastic curvatures; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ac452d
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: Measurement of elastic properties, especially the Poisson's ratio, utilizing non-contact techniques in a tensile experiment is very challenging. This is primarily due to the poor spatial resolution and the large strain noise inherent to these techniques. The difficulty level increases many folds when Poisson's ratio of less elongating, stiffer, and/or brittle materials, like ceramics and ablatives, is measured. This paper reports a newer approach that employs 3-D digital image correlation (3-D DIC) in a Cornu's experiment to enable accurate measurement of elastic properties in a single test. The deflection field obtained from 3-D DIC in the form of anticlastic surfaces during Cornu's experiment is utilized for determining Poisson's ratio. In the same experiment, the elastic modulus is estimated using the center point deflection method. The proposed methods are validated with standard materials and extended to newly developed materials. Cornu's method with 3-D DIC can provide the elastic properties with ease and has many advantages over other conventional techniques.