Analysis And Life Prediction Of Inner Surface Crack Of Ultra High Pressure Vessel Based On ASME Code

With the vigorous development of modern industrial technology,pressure vessels have been widely used in all walks of life.As a sealed container that can withstand pressure,it has been widely used and occupies an important position in many industries such as civil,industrial,and military industries,as well as in many scientific research fields.Among them,the destruction of crack defects is a common defect problem in pressure vessels that can easily cause serious damage.How to find a more accurate method for judging the growth of cracks and predicting the service life of the container has always been a hot spot for scholars in related industries and various countries.This paper is based on the ASME Ⅷ-3 "RULES FOR CONSTRUCTION OF PRESSURE VESSELS"(another rule for construction of high pressure vessels)formulated by the American Society of Mechanical Engineers.Through the fracture mechanics calculation method,the surface cracks of the given model are fatigued and the remaining Life calculation analysis and other work.The main work content is as follows:(1)Introduce the world mainstream codes on the construction of pressure vessels,learn the theories and methods of fracture mechanics,and apply the theories and methods of fracture mechanics in ASME codes in combination with relevant theoretical knowledge.(2)Based on the content of ASME code,the life of surface crack of ultra-high pressure vessel is calculated.Combined with the fad judgment method in api579-1 / ASME ffs-1 code,the final crack propagation depth is analyzed and calculated.A set of overall analysis and calculation method is sorted out through the two specifications.Through the two specifications,a set of overall analysis and calculation method is sorted out.From the calculation results,it is considered safe and reliable,but the value method is relatively conservative.(3)Through the finite element simulation method,ABAQUS and FRANC3 D were used for co-simulation.By comparing the simulation data with the ASME calculated data,the fatigue crack life was obtained.The error between the simulation data and the calculated data was 2.7%,and the overall error was small,which proved that the finite element simulation was accurate and feasible for the calculation of fatigue crack propagation life.(4)The stress intensity factor and the number of fatigue crack growth cycles were calculated and analyzed.The results show that the initial crack size has a great influence on the fatigue growth.The other factors that affect the fatigue growth of cracks are analyzed and the corresponding countermeasures are put forward.In this paper,the super high pressure vessel wall longitudinal surface crack fracture mechanics analysis and calculation,tease out a set of the calculation method of fracture mechanics,points out the existing in the application of ASME code in some problems and the insufficiency,but for this kind of pressure vessel safety assessment and life forecast provides a new method,has certain academic value and engineering value.