Strength Analysis Of Reinforced Thermoplastic Vessel

Reinforced thermoplastics vessels are gaining more and more attention in the fields of aerospace catalyst storage, nuclear industry corrosive media transportation and automobile industry due to corrosion resistance, fatigue resistance and low production cost. At present, the research on winding vessels is mainly focused on the metal liner winding vessels. And the study of plastic liner vessels is less, lacking uniform design standards in China, the quality of production products can not be effectively guaranteed. The state was ordered to suspend production. In this paper, the finite element numerical analysis method is used to analyze the liner, winding process and strength of the vessel,and the concrete contents are as follows:(1) The performance of high-density polyethylene materials were studied and the corresponding parameters and curves were obtained,which provided accurate parameter setting and analysis of the results for subsequent finite element simulation. Based on the experimental results,ANSYS ACP module was used to analyze the reinforced concrete cylinder and the axial compression static analysis was carried out. The results show that the axial compression performance is negatively correlated with the angle between the fiber and the load, and the HDPE liner has the effect of weakening the axial compression performance.The lining material is prone to shear failure at low winding angles. And between 45 ° and 60 °, the winding cylinder performance is effectively improved.(2) The stability of HDPE liner was analyzed by finite element buckling method. The critical buckling load and the nonlinear critical buckling load are calculated respectively, and the buckling state and load - displacement curve of the inner liner are obtained. On the basis of this, the influence of the thickness of the liner and the aspect ratio on the two buckling loads was analyzed. The results show that the buckling load of the liner decreases with the decrease of the thickness, and decreases with the increase of the aspect ratio.(3) The finite element method is used to analyze the winding tension and autofrettage pressure. Based on the equivalent cooling method, the ANSYS ACP module was used to define the laying design and coordinate transpose. The influence of the winding tension and autofrettage pressure on the performance of the whole spiral wound vessel was analyzed. The results show that the winding tension has no obvious effect on the strength index of plastic liner. In the working pressure state, the winding tension causes the liner to yield before the autofrettage force plays a leading role in the performance of the liner.The Mises stress of the liner was negatively correlated with the autofrettage pressure. When the winding tension has caused the liner to yield, the winding tension plays a leading role, the liner Mises stress is positively correlated with it.(4) According to the grid theory and composite material failure criterion, ANSYS ACP module was used to improve the thermosetting vessels, and the thickness of the vessel fiber was set. Based on this model, the stress and strain analysis of the vessel and the failure analysis under the corresponding criterion are used to calculate and predict the burst pressure and position of the vessel. The results are basically the same as those of the vessel explosion accident.