Finite Element Analysis And Structure Optimization Design Of Ultra-high Pressure Bursting Disc

As the safety protection hardware of pressure vessel,the bursting type and design bursting pressure will directly affect the stability of pressure vessel and the safety of production.There are many factors affecting the bursting characteristics and bursting pressure of the bursting disc,such as the size,structure,material and processing technology of the bursting disc.With the help of finite element analysis software,this paper studies the influence of the fillet and groove structure of the pressure ring on the bursting disc,which is of great significance for the design and manufacture of the ultra-high pressure bursting disc.This paper is mainly as follows:（1）The geometric model of the bursting disc and its solving process are established according to the actual working condition.The true stress-strain curve of 316L stainless steel was obtained by tensile test.Firstly,using drawing software to establish the geometric model of the bursting disc in accordance with the actual working conditions,and use ANSYS finite element software to set the unit characteristics and material characteristics of the bursting disc and the holder,and impose the accurate load and constraints on the bursting disc according to the actual situation.Then use the solver to solve the problem,and analyze and processe the finite element results to obtain the stress-strain distribution of the bursting disc under different parameters and working conditions.Finally,by comparing the results of numerical simulation and theoretical analysis,determine the accuracy of the finite element solution process.（2）The effect of the fillet of the bursting ring on the bursting position and pressure of the ultra-high pressure bursting disc is studied.With the help of finite element analysis software,the influence law of ring fillet（radius r）on the bursting position of the bursting disc and the influence law of ring fillet bending degree（the ratio of radius r to thickness t₀）on the bursting position and bursting pressure of the bursting disc are explored.According to the bending degree,the bursting disc can be divided into three regions:in the unstable region,the bursting position of the bursting disc occurs at the edge because the radius of the fillet of the pressure ring is too small;In the substable region,the stress level at the edge of the bursting disc is lower than the stress level at the top,but because of the sliding,bonding and other factors between the fillet of the pressing ring and the edge of the bursting disc,the bursting of the bursting disc is easy to occur at the edge.In the stable zone,the maximum stress occurs at the top position of the bursting disc,and the bursting disc occurs at the top position.（3）The influence of groove structure and type on the failure location and bursting pressure of the bursting disc is studied.Firstly,the influence of groove structure and size of four rectangular groove,U groove and V groove on the bursting position of the ultrahigh pressure bursting disc is studied.The analysis shows that when the ratio of groove height to the original wall thickness of the bursting disc（h0/t 0）is greater than or equal to 31%,the maximum stress value of the bursting disc only appears at the groove position of the bursting disc,and the bursting disc may burst into four lobes according to the expected rupture mode.Secondly,the influence of groove height on the bursting pressure is studied.With the increase of groove height,the bursting pressure of the bursting disc decreases significantly.Finally,the influence of different groove width on the bursting pressure of the bursting disc is explored:with the increase of groove width of the blasting moment,the ability to resist its plastic deformation will become weaker and weaker.And it is concluded that the bursting pressure of the bursting disc will decrease with the increase of groove width,but because of the different groove structure,the amplitude of the bursting pressure reduction will be different.