混凝土楔入劈拉破坏的数字图像相关方法研究

通过无损检测的光学测量方法——数字图像相关方法(DIC),对楔入劈拉试验过程中的混凝土进行了表面应变变化过程的测量。采用高分辨率摄像机进行试件表面图像的采集,通过数字图像相关方法对图片进行后处理,计算出试件表面每一点的应变量。通过对应变云图的分析,研究了混凝土在楔入劈拉试验过程中的裂纹扩展。结果表明,混凝土微裂纹往往出现在砂浆和骨料的边界处,并由此发展,此方法可以预判混凝土试件的破坏位置,可以用于结构监测和检测。

Study on Concrete under Wedge Split Experiment usingDigital Image Correlation Method

Digital image correlation method, a non-destructive optical technology, was used to measure the surface strain of concrete under wedge split experiment. High resolution photos of concrete surface captured by digital camera were processed by digital image correlation method to measure the strain on concrete surface. This paper also studies the micro-cracks on the concrete surface by analyzing the strain nephogram. The result shows that micro-concrete usually appears at the boundary between the sand pulp and the skeletal material. As a result, this method can be used to predict the position of the crack of the concrete and it can also be used for structure monitoring tests.