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Table 5 Correlation between Theoretical and Numerically Predicted burst pressure

Table 5 Correlation between Theoretical and Numerically Predicted burst pressure

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2.2.5 Procedure For all metal (only liner) pressure vessel, 3-noded triangular shell element whereas for COPV and all composite pressure vessel,4-noded quadrilateral shell element were used to generate the finite element model except at the vicinity of the defect, where 3-noded triangular shell element was used. Finite element meshed models for liner and COPV are shown in figures 2 and 3 respectively. For boundary conditions, both ends of the cylinder are considered as fixed. The step-by-step procedure adopted for the prediction of burst pressure by finite element analysis is given in flow chart (Figure 4). ANSYS Composite PrepPost(ACP), an add-on module is exclusively designed for modeling of layered composite structures. In the present work, ACP(Pre) is used for the analysis of COPV.
2.2.5 Procedure For all metal (only liner) pressure vessel, 3-noded triangular shell element whereas for COPV and all composite pressure vessel,4-noded quadrilateral shell element were used to generate the finite element model except at the vicinity of the defect, where 3-noded triangular shell element was used. Finite element meshed models for liner and COPV are shown in figures 2 and 3 respectively. For boundary conditions, both ends of the cylinder are considered as fixed. The step-by-step procedure adopted for the prediction of burst pressure by finite element analysis is given in flow chart (Figure 4). ANSYS Composite PrepPost(ACP), an add-on module is exclusively designed for modeling of layered composite structures. In the present work, ACP(Pre) is used for the analysis of COPV.
The deformation of the pressure vessel recorded by the software for the incremental internal pressure are plotted for different types of pressure vessels namely., all metal, all composite and COPV by varying the wall thickness. Typical plots obtained from the software are shown in Figure 5.
The deformation of the pressure vessel recorded by the software for the incremental internal pressure are plotted for different types of pressure vessels namely., all metal, all composite and COPV by varying the wall thickness. Typical plots obtained from the software are shown in Figure 5.
Figure 5(a) reveal that, the deformation of all metal (liner) pressure vessel is negligible at the beginning followed by significant deformation for small incremental pressure as indicated by the plateau region. The pressure versus deformation plots for all composite and COPV pressure vessels showed almost identical trend with linear increase in the deformation with the incremental increase in the pressure (Figures 5(b), 5(c) and 5(d)). Firstly, we calculate the burst pressure theoretically for all the cases and mention some more value in the FE analysis. In FE analysis the software wil take incremental value of pressure for every time step and the pressure versus deformation graph will plotted. At a particular pressure when the elements are deformed plastically and fails to withstand that pressure and that pressure is burst pressure and very next iteration software will take the maximum value of pressure that we mentioned in the software that’s why the change of slope in the curve will occurs. The pressure corresponding to sudden rise and change in slope of the curve is the indication of burst pressure. At this point, the pressure vessel loses its capability to resist deformation.
Figure 5(a) reveal that, the deformation of all metal (liner) pressure vessel is negligible at the beginning followed by significant deformation for small incremental pressure as indicated by the plateau region. The pressure versus deformation plots for all composite and COPV pressure vessels showed almost identical trend with linear increase in the deformation with the incremental increase in the pressure (Figures 5(b), 5(c) and 5(d)). Firstly, we calculate the burst pressure theoretically for all the cases and mention some more value in the FE analysis. In FE analysis the software wil take incremental value of pressure for every time step and the pressure versus deformation graph will plotted. At a particular pressure when the elements are deformed plastically and fails to withstand that pressure and that pressure is burst pressure and very next iteration software will take the maximum value of pressure that we mentioned in the software that’s why the change of slope in the curve will occurs. The pressure corresponding to sudden rise and change in slope of the curve is the indication of burst pressure. At this point, the pressure vessel loses its capability to resist deformation.
Figure 6 Deformation corresponding to burst pressure
Figure 6 Deformation corresponding to burst pressure
pressure. The deformation of COPV with liner thickness of 1mm and composite thickness of 5 mm is 12 mm which is 58.38% lesser than all metal pressure vessel. Lesser deformation is the indication of greater stiffness of COPV which is a measure of better resistance to deformation. The deformed pressure vessel along with the value of maximum deformation as obtained from ANSYS is shown in figure 7 for all metal pressure vessel and COPV with 1 mm liner and 5 mm composite wall thickness. 2.5 Conclusions
pressure. The deformation of COPV with liner thickness of 1mm and composite thickness of 5 mm is 12 mm which is 58.38% lesser than all metal pressure vessel. Lesser deformation is the indication of greater stiffness of COPV which is a measure of better resistance to deformation. The deformed pressure vessel along with the value of maximum deformation as obtained from ANSYS is shown in figure 7 for all metal pressure vessel and COPV with 1 mm liner and 5 mm composite wall thickness. 2.5 Conclusions
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