The use of Digital Image Correlation in determining the mechanical properties of materials

3rd China-Romania Science and Technology Seminar

自然科学;工业技术

Cerbu, C.^1 ; Xu, D.^2 ; Wang, H.^2 ; Roca, I.C.^1

Department of Mechanical Engineering, Faculty of Mechanical Engineering, Transilvania University of Braov, B-dul Eroilor No. 29, 500036, Romania^1

Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Guangrong Road No. 409, Beichen District, Tianjin

300134, China^2

关键词: Digital image correlation methods;    Digital image correlations;    Longitudinal strain;    Mechanical properties of materials;    Regression function;    Tensile specimens;    Testing procedure;    Transverse strain;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/399/1/012007/pdf
DOI  :  10.1088/1757-899X/399/1/012007

来源: IOP

【 摘 要 】

The main purpose of this paper is to study the use of Digital Image Correlation in order to determine the Poisson's ratio in the case of aluminium alloy and composite materials under tensile tests. The satisfactory results obtained in the case of specimens made of aluminium alloy prove that Digital Image Correlation is able to satisfy the requirements in order to determine the Poisson's ratio. The testing procedure was carried out for two kinds of composite materials: (1) jute / epoxy composite material; (2) jute / glass / epoxy composite material. During the tests, a digital camera was used to capture the images of the tensile specimen during the tensile test. In order to measure both the longitudinal strain in direction of the tensile force and the transverse strain, the Digital Image Correlation method is used in the post-processing of all images recorded for each specimen. The data of transverse strain related to the longitudinal strain were graphically shown. The initial portion of curve corresponding to the linear portion of the stress-strain curve, was approximated by a linear regression function for each specimen tested. The slope of the fitting line represents Poisson's ratio. The Poisson's ratio, corresponding to the reinforcing plane with fabric for Jute / epoxy composite, is 35.5% greater than the corresponding to Jute / glass / epoxy composite.