| The metallic rupture disc has been one of the most effective equipments to prevent overpressure from explosion for the fluid pressure equipments. To study the bursting properties and influencing factors on the design, manufacture and use has an important guiding significance. The research on the bursting properties by the experimental method takes much time and energy, and costs much money. With the development of the finite element technology, the numerical simulation has become an important approach. By using the elastic-plastic theory and FEM of large plastic deformation in thin shell, the bursting properties of the rupture discs which include the conventional simple domed, forward acting cross-scored, flat scored and reverse domed were studied, and the factors which influences the bursting properties were discussed.The main research contents and conclusions in this paper are as follows.(1) The FE model of conventional simple domed rupture disk was built. Comparing the numerical simulation results with the experimental results, the model was proved to be valid. Based on the model, the relations between the pre-bulged pressure and central deflections and the effects of the corner radius and preformed pressure on the bursting properties were studied. The results show that, when the optimum in the event that the corner radius divide by original thickness equals5, or taking the maximum of the allowed radius; the preformed pressure equals90percent of burst pressure; for stainless steel, the relation between the preformed pressure and the arch height was got.(2) The FE model of forward acting-scored rupture disk was built. The simulation results were very close to the experimental results. The effect of the shape and length of cross pre-weakened scored on the bursting pressure was researched The results show that, when the length of no breakthrough area of top cross is2.5～4mm, and the distance between the pre-weakened scored and arch face is1～5mm, there is no bigger effect on bursting pressure; Comparing the V scored with the rectangular scored and the arc scored, it has the bigger load bearing capacity.(3) The FE model of flat scored rupture disk was built. The effect of film thickness, depth and numbers of pre-weakened scored on the bursting pressure was researched. The results show that, when the residual thickness is the same, the bigger the initial thickness is, the smaller the load bearing capacity is; there is a linear relationship between the residual scored depth and the bursting pressure; The increase of the numbers of acting scored make the bursting pressure and deformation height increase.(4) The FE model of reverse domed rupture disk was built. Considering the non-symmetry, the finite element method was used in this paper to calculate the critical buckling load through establishing the whole model of reverse domed rupture disk. Nonlinear analysis was used in this paper, considering the non-linearity both in material properties and in geometry of deformations. Comparing the results of experiment and simulation, they tallied with each other. Then, a summary of the connections was made in this paper between, the pre-bulged central deflections and the thickness of metal irises. In the end, the relevant empirical formulas were summarized through the collation based on the previous studies and the analysis of a large quantity of test and simulated data. The engineers can prefigure out the buckling critical load by using it.(5) The structural damage range was defined and normalized on the base of the previous research findings. Then, the influence of the damaged fundamental dimensions on the buckling pressure was analyzed by FE software ANSYS. The results show that, the minimum acceptable diameters of damage range can be calculated through computing instances. The buckling critical load of the damage in symmetrical position was0.7times of asymmetrical location for reverse domed rupture disk. In the end, the article analyzed the effect of boundary conditions against buckling pressure. |
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