Safety Assessment And Simulation With The Finite Element Method On The Pressure Vessels

With the development of the modern industry, pressure vessels become large-scale, complicate, high-parameter and strict-conditions. The regard to the safety of pressure vessels, especially to the safety assessment of pressure vessels which containing defects have attracted wide high attention. At the present, the engineering community proposed the "All in the use of principle, and they launched a series of studies to develop the safety assessment standards of pressure vessels which containing defects. In addition, it is worth mentioning that the rapid development and wide application of the numerical analysis method, for example, the finite element method, has greatly increased the efficiency of the research and, their analytical results and experimental test results are similar, so it helps to save more fund in this subject.This paper, through the stress analysis of the pressure vessel, tries to calculate the rate of the fatigue expansion based on CVDA-1984. And by the use of the finite element software-ANSYS, the paper establishes a surface crack 3-D model, simulates an important parameter-the stress intensity factor, that can best reflect the status of the crack front. This paper also analyses the change of the stress intensity factor value which is influenced by the limited elastomer's height and weight. These results of the study provide a theoretical basis for the safe use and reliability evalution of the equipment.This paper is based on fracture mechanics, this method that using the theory of fracture mechanics and numerical analysis is in order to define an accurate fatigue life of the pressure vessel at different crack size and form.To determine the safety and reliability of the pressure vessel which containing crack defect aimed to reduce unnecessary shutdowns and maintenance, therefore, it enhance the economy and reliability of the equipment. So the study of this topic has more practical significance.