Structure Analysis And Topology Optimization Of The Heavy Rigid Coupling

Coupling is a connection device connected with grooved pipe fittings,valves and piping accessories.Grooved coupling pipe joint is a kind of new type joint pipe,it consists of coupling rubber sealing ring and fastener,etc.as a sleeve type quick joint installed in the circular groove processed on pipes,pipe fittings and other pipeline connection parts.The application of coupling pipe fitting technology makes the complicated pipe connection process easy,fast and convenient,so that breakthroughs in pipeline connection technology.At present,there are problems in domestic coupling design,such as depend on the reference to foreign product resources,the problems with the use of the coupling can’t be solved reasonably and effectively by improvement of product according to it,the development of new product structure has great blindness and it is very difficult to realize the test for the small coupling structure.Therefore,based on the existing structure and using the finite element analysis method to obtain the force characteristics of the coupling,it is very important to realize the reasonable improvement of the coupling structure.Based on the research of groove type coupling pipe joint at home and abroad,this paper use DN80 heavy rigid grooved coupling as a simple prototype.The SolidWorks modeling software was used to complete the establishment of the entity model and output of the x_t format was imported to ANSYS for the establishment of the finite element model.The stress analysis of the coupling structure was completed and the stress distribution was obtained,according to the stress cloud,it is observed that the maximum stress point MX and the greater stress area occurred near the junction of the bolt fixed platform and the curved shell,and concluded that the maximum stress of the hoop is linearly increased with the internal pressure;It is also observed by the stress cloud that the stress values of the ribbed plate along the axial direction are smaller and along the circumference are larger,but on the whole,the overall strength of the structure is not increased by the design of the ribbed plate.The nonlinear behavior of rubber material is simulated by a two-parameter Mooney-Rivlin material model and the rubber nonlinear contact is simulated by establishing contact pairs with the sealing ring,the nonlinear contact analysis of coupling and sealing ring is completed to reach these conclusions that the maximum stress area of the sealing ring appears in the bending of the inner wall,it is concluded that the sealing ring can guarantee the sealing effect form the contact stress on the contact surface of the sealing ring and the coupling is greater than that of the liquid pressure,and the sealing performance increase with the pressure of the liquid in the pipe;Compared with the maximum stress of the coupling not considered contact with the sealing ring,it is found that the force of the coupling is reduced by the sealing ring and the greater the maximum stress reduction of the inner pressure is.On the basis of the above research,the finite element model of the topological optimization region is established on the ring shape region of the ribbed plate in,and the topological optimization analysis of the region is completed.According to the optimization analysis and structural analysis results,the coupling structure of the new reinforced structure is designed.Through the verification analysis,proves that the new coupling structure stress distribution is more homogeneous,the overall reliability is higher,the new reinforced structure in the use of the ribbed plate structure about 66%of the material,but the reliability obtained is higher than the original structure.