Study On Multi-Field Mindlin Plate Bending Element Based On The ADINA Program's Secondary Development

Because of"shear locking"phenomenon,it is impossible for thick plate element to transfer into thin plate element in the finite element calculation,it is interested and attracted problem for many reserchers in the past 40 years that a kind of plate bending which can fit for both analysis of thick plates and of thin plates is established.In this dissertation,several rational,simple methods are presented to overcome the difficulties in the construction and application of above elements.Good results can be obtained by the proposed approaches.The main contributions of this dissertation are as follows:1 A element of the bending analysis of thick-thin plate based on the Hu-Washizu revised-variational principle for the Mindlin plate theory is established.In the element,the bending terms are conformed by the single displacement fields and the shear terms are conformed by the hybrid stress fields with the help of the thought of many filed interpolation.With the help of energy releasing,a plate bending element for thick-thin analysis and with"shear locking"has been established.2 Based on ADINA's Software of finite elementsWith the help of two functions of the ADINA's program,One is through second exploitation of the ADINA program'General element, element stiffness is direct inputed.the other is through second exploitation of the ADINA program'User-supplied general element,The subroutine CUSERG of ADINA is added to ADINA through compiling and linking,the plate bending element established in the paper has been added to the ADINA programs.3 Exact,convergency,boundary effects and thick-thin plate bending analysis for the plate bending element established by the paper has been studied.The results show that the element has a good character- istic of numerical,convergency,thick-thin analysis.