Digital Image Correlation Test System with Automatic Transmission for Quasi-Brittle Material

Abstract:

To realize the automatic transmission for present digital image capture test system, a new system which consists of laptop computer, camera, fixing device and mechanical testing machine was presented and designed. The Monitor software, which was developed using MATLAB to realize automatic transmission function for the system, includes slow and high speed. The general stage and key stage for quasi-brittle materials can be effectively captured by the software. With MATLAB, the digital image correlation software (DIC) was developed. In DIC the first image is used as the base image. The images are sorted by photographing time (or file name), and the listing file is generated. The grid is drawn on the base image to divide the area into ‘facets’, the size of which can be adjusted between 1pixel and 100 pixels. Based on fast Fourier transform and convolution algorithm, the image comparison is realized and the deformation of the material is calculated. The designed system is applied to the compression test of a concrete specimen, and the results show that the system realizes automatic transmission image capture, and calculates accurate displacement. The displacement distribution is uniform in linear elastic stage, and varies in yielding stage. This is mostly due to localized failure and displacement discontinuity.

• Periodical: Applied Mechanics and Materials (Volumes 405-408)
• Pages: 2515-2519
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.405-408.2515
• Online since: September 2013
• Authors: Hong Liang Yue*, Chun Hui Zhang, Yan Wang
• Keywords: Automatic Transmission, Digital Image Correlation (DIC), Fast Fourier Transform (FFT)

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