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Optical strain for monitoring of concrete failure mechanism with discontinuity

机译：用于监测具有不连续性的混凝土破坏机理的光学应变

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Finite-element-based digital image correlation (FEM-DIC) is one of the most widely used noncontact techniques in the field of experimental mechanics for measurement of deformation/strain. In this paper, the FEM-DIC method is refined by introducing the concept of multilevel extended digital image correlation (X-DIC), which also can capture deformation across discontinuity planes if they exist in images. Using regular and enhanced displacements at each node, strain tensors are estimated by applying the concept of smooth particle hydrodynamics (SPH). Numerical works are carried out to check the accuracy level of the developed algorithm by considering discrete discontinuity on the surface of a sample. Work is further extended to determine displacements and strains developed at the surface of several cubical concrete samples under uniaxial loading conditions. The tests are conducted until fractures are developed in the post-failure region. Using the concept of cumulative effective strain, a parameter is identified, which can be used as a precursor in the object failure process. (C) 2015 Optical Society of America
机译：基于有限元的数字图像关联（FEM-DIC）是用于测量变形/应变的实验力学领域中使用最广泛的非接触技术之一。在本文中，FEM-DIC方法通过引入多级扩展数字图像相关性（X-DIC）的概念进行了改进，如果它们存在于图像中，则还可以捕获跨不连续平面的变形。在每个节点处使用规则位移和增强位移，通过应用光滑粒子流体动力学（SPH）的概念来估算应变张量。通过考虑样本表面上的离散不连续性，进行了数值工作来检查所开发算法的准确性水平。为了确定在单轴载荷条件下几个立方混凝土样品表面上产生的位移和应变，需要进一步扩展工作。进行测试直到失效后区域出现裂缝。使用累积有效应变的概念，可以确定一个参数，该参数可以用作对象破坏过程中的先兆。 （C）2015年美国眼镜学会

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