Abstract:
Wedged link is widely applied to circular cabin section linking structure for the advantages such as structure reliability, convenient installation and removal as well as high space utilization ratio. Generally, wedge block strength analysis use engineering method. However, the transfer load of wedge block must be obtained firstly, which is usually difficult. The adoption of finite element method makes it possible to simulate the complex load transferring relationship between wedge block and cabin body, thus obtaining a more comprehensive integral structural stress distribution. Nevertheless, the computation convergence is not satisfactory due to a number of contact surfaces. On the basis of ANSYS Parameter Design Language (APDL), the full contact analysis command stream is developed to carry out the detailed designs for structural size, tolerance fit clearance and pre-stress. In accordance with the theoretical analysis and engineering application experience, the model is established by taking the uprising wedge block, inverse wedge block and straight wedge block as an integral, meanwhile the initial pre-stress is simulated through the thermal load, which enables it to build the contact among the wedge block, internal cabin body and external cabin body, so as to truthfully reflect the structural load transferring status. The building of elastic connection structure between different independent wedge blocks and the adding of externally imposed displacement restraint on the elastic connection structure effectively solve the problem of computation divergence. In the meantime, the impact of additional restraint on the mechanical structure can be reduced to the acceptable level for engineering by adjusting the stiffness of elastic connection structure.