Research On Analytic System Of Thermal Weight Function Method By ANSYS

The SIFs of the crack body under thermal shock can be calculated through integration ofproduct of the thermal weight function (TWF) and the temperature using thermal weightfunction method (TWFM). TWF is independent of time and dependent only on geometry ofthe crack body. So the repeated determinations of the distributions of stress through finiteelement method or boundary element method through thermal shock are avoided. But the newand high efficient method is not used in popular finite element analysis softwares such asANSYS,ABAQUS,MARC at present. In this study, the analytic system of TWF method usedfor solving the problems ofⅠ/Ⅱmixed mode crack under thermal shock is establishedunder the circumstances of ANSYS.Firstly, the basic principles of the thermal weight function method and finite elementmethods were analyzed, the required data types needed to be extracted and the technology tobe implemented, which are used to develop the analysis system of the thermal weight functionmethod in ANSYS are determined.Secondly, the binary files in ANSYS and the subroutines for data reading are studied, theprogramming method of the FORTRAN software to extract the data are given , also thecompile connection method of FORTRAN and ANSYS, the calculations of the SIF and therealization of the virtual crack extension technique have been studied.Then, combined with finite element calculation of the thermal weight function methodand numerical integration methods, the analytic system of TWFM forⅠ,Ⅱmixed modecrack are developed.Finally, the application of thermal weight function analytic system are used to calculate anumber of examples, also the results are verified by the other methods. Results have shownthat: the thermal weight function analysis system has high accuracy and computational efficiency.