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Xu Xiaohai, Su Yong, Cai Yulong, Cheng Teng, Zhang Qingchuan. INFLUENCE OF SHAPE FUNCTIONS AND TEMPLATE SIZE IN DIGITAL IMAGE CORRELATION METHOD FOR HIGHLY INHOMOGENEOUS DEFORMATIONS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2015, 47(5): 848-862. DOI: 10.6052/0459-1879-15-119
Citation: Xu Xiaohai, Su Yong, Cai Yulong, Cheng Teng, Zhang Qingchuan. INFLUENCE OF SHAPE FUNCTIONS AND TEMPLATE SIZE IN DIGITAL IMAGE CORRELATION METHOD FOR HIGHLY INHOMOGENEOUS DEFORMATIONS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2015, 47(5): 848-862. DOI: 10.6052/0459-1879-15-119
shu

INFLUENCE OF SHAPE FUNCTIONS AND TEMPLATE SIZE IN DIGITAL IMAGE CORRELATION METHOD FOR HIGHLY INHOMOGENEOUS DEFORMATIONS

  • Department of Modern Mechanics, University of Science and Technology of China, CAS Key Laboratory of Mechanical Behavior and Design of Materials, Heifei 230027, China

Funds: The project was supported by the National Basic Research Program of China (2011CB302105)and the National Natural Science Foundation of China (11372300, 11332010, 51271174, 11127201, 11472266 and 11428206).
  • Received Date: April 08, 2015
  • Revised Date: June 14, 2015
    Graphical Abstract
    • Abstract
  • Digital image correlation (DIC) method and its reliability and accuracy are commonly accepted in the measurements of affine deformations since it obtains comparable results with strain gauges. However, in engineering measurements, there are always substantial local deformations with high strain gradients such as the Portevin-Le Chatelier (PLC) bands, deformations near gaps and crack tips. In these situations, because the results within the contact areas are smoothed, strain gauges are restricted. Here DIC method can be employed to solve this problem. Problems that the calculation parameters (the order of shape functions, template size, etc.) seriously impact on the results and often make it difficult to get reliable results. In this paper, the deep mechanism that how the shape functions and the size of the templates impact on the accuracy of DIC results is discovered via analyzing PLC bands with different gradients in tensile tests and simulated bands. Second-order shape functions are more suitable than first-order shape functions to describe local deformations according to the simulation results. A gist is proposed that the results of second-order shape functions are reliable and accurate when the relative error between first- and second-order shape functions is less than 10%.
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