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In the present study the problem of calculation of the stress intensity factors (SIF) of semi-elliptical cracks located in the shell and knuckle area of a pressure vessel is numerically solved by 3D Extended finite element method (XEFM) analysis. Crack also will be varied based on crack depth at constant elliptical ratio. The modeling details of th...
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Energy sources that can be utilized by humans are oil and natural gas. However, in exploration activities, there are problems regarding the risk level determination of equipment in offshore platforms. The equipment that has an important function for the processing of oil and gas is a pressure vessel. In the contents of the hydrocarbon flow produced...
Pressure vessel is an important part of industrial production. Pressure vessels usually have many nozzles, which are connected to other devices through pipeline. Due to the large thermal stress caused by the thermal expansion of the pipeline, the load on the nozzle of the connected vessel will be increased. When the load on the nozzle is too large,...
Citations
... Pressure vessels are generally utilized in enterprises and breaks can typically be seen right now structure. Kusmartono et al. [17] numerically solved the issue of estimation of the stress intensity factor factors (SIF) of semi-circular cracks situated in the shell and knuckle region of a pressure vessel by 3D broadened limited component strategy (XEFM) examination. Recreations will be completed on the shell and knuckle territory where research of pressure focus in the knuckle region is moderately constrained. ...
Autofrettage is the process to find the residual stress properties of the thick cylinder under the high-pressure scenario. Due to the cost and material demands, the elastoplastic behaviour offers better durability result is increased resistance to cracking. One of the main parameters for the cause of cracking is the enormous level of pressure and with the autofrettage process, the durability of the material is boosted up and improves the corrosion cracking resistance. Another factor of autofrettage is the fatigue life of a thick cylinder under stress. The fatigue life of the material can be evaluated by a computerized method analysis to minimize the level of Von-Mises stress under the operating pressure condition. Conducting the computerized analysis by modelling the geometry of the model with frictionless support and acting pressure on the cylinder model. ANSYS finite element modelling is largely utilized tool in the material testing with an advantage of less computing time and cost. Since the results obtained from the simulation progress are actualized with the real-time condition by applying the real constraints in parametric setting and boundary conditions respectively. In this research work, the autofrettage of a thick cylinder is carried out in the finite element modelling using ANSYS workbench 18.1. The modelling is done for the boundary condition of pressure level of 45, 96, 110 and 134 MPa. A 3D model of cylinders is created with the dimension of the inner radius of 15mm, the outer radius of 35mm with the thickness and length of 15mm and 250mm respectively. Though the analysis is run for the different pressure limits and autofrettage on the thermal insulated thick cylinder is investigated for the stress parameters under shrink-fit pressure limits. The result from the analysis indicates that the autofrettage pressure at 159 MPa the cylinder withstand pressure beyond the limit it collapsed. Hence, it is evident from the result, the selected AISI 4630 steel material of thick cylinder can withstand the autofrettage under thermal shrink-fit condition under the maximum autofrettage pressure limit of 159 MPa respectively.
