Study on Mechanical Properties and Fractal Characterization of Concrete under Impact Load

摘要

In order to research the mechanical properties of concrete under impact load, a splitting tensile test of concrete cubes was carried out under the impact load by using the drop test machine. A high-speed camera was used in test to record the crack development process of each specimen. According to box dimension algorithm thoughts and principles of digital image storage, simple algorithms designed based on Matlab computing capabilities of concrete specimens damage crack fractal dimension of under the impact loads. The results show: with the increase of drop height and quality, loading rate, peak load and strain rate has significant strain rate, the crack fractal dimension values are increasing gradually; the surface crack distribution and development process of damaged concrete exhibit fractal properties, the fracture fractal dimension of the specimen increases with time, and when it is under different impact conditions, the fractal dimension of the specimen increases with the increase of the impact load and the strain rate.