Study Of Bonded Periodic Blunt Crack

The crack research in the Fracture Mechanics is inseparable with human production and life. Whether bridges crack, buildings crack, earthquake crack, or mechanical fatigue cracks are related to people’s life and property safety. In the theory research, the single crack research is very mature. But in the real life, the two or more cracks with a certain width called blunt cracks appear at the same time not appear just one crack. Closer to the real life is the point of view of the paper. So research the condition of multiple simultaneous blunt cracks is the main content of the paper. In order to better study the stress condition of blunt cracks, and the periodical type blunt cracks were studied in the paper. In the paper, the principle of Fracture Mechanics was applied and the study of the periodical blunt crack was carried out, and relevant conclusions were obtained.A brief introduction was made in the paper at the first about the generation, the development and applications in the houses, bridges, the earthquake and the machinery. And then the principle of Fracture Mechanics was described in details. The basic equation was established for the first basic question of the different materials welding, and the theoretical analysis was carried out applying the complex variable method. And then the simplest form was obtained. In the paper, the analytical solution to the question was obtained. And then the simulation of the solution was carried out using the MATLAB. The trend figures of the stress in the blunt crack tip varies with the ratio of the period length with blunt crack length, the blunt crack width, the ratio of blunt crack length with width were plotted, and organize, contrast, analysis was made about figures plotted. Finally, in the paper, summarized was made and settlement proposals encountered in the practical life were put forward.