The Inner Pressure Of Cylindrical Pressure Vessel Opening Rate On Reinforcement Structure And The Stress Concentration Factor Law

The shows distribution of the area nearby the junction of the nozzle and the shell of large nozzle-to-cylinder diameter ratio structure are studied. Three kinds of structures namely are studied and compared each to other. The finite element method and the strain-gauging method are applied in this work to investigate the distributions at reinforced area. Some new and valuable conclusions are achieved. The finite element model is established automatically by mathematical method with DXF form. The results of analysis and experiment prove that the method above is valid. This work provides an efficacious way for numerical model. According to the researches of the reinforced structures above, One of the reinforced structure is proposed. Based on the finite element analysis for the nozzle-reinforced structure, the stress concentration factors are calculated. An empirical equation is proposed for predicting stress concentration factors. The stress concentration factors may be considered as a function of 3 non-dimensional parameters X = d I DT , = T/D and = (D-t)l(d-T). The empirical equation in the form of a polynomial has been obtained bythe least squares method. The results computed by this empirical equation, together with those by Lind's, Decock's, Money's and Xie Duan-shou's equations, have been tabulated. A comparison shows that the results of the present empirical equation are close to and are slightly lager than to those of the four equations. The reason for this is, the average value of steep stress field is obtained by strain-gauging method, and the peak stress can not be measured by this method. The results computed by numerical method are preferably coincided with the real case, and this will lead to safety.