Type of Document Dissertation Author Promwungkwa, Anucha Author's Email Address apromwun@vt.edu URN etd-41098-234722 Title Data Structure and Error Estimation for an Adaptive p-Version Finite Element Method in 2-D and 3-D SolidsDegree PhD Department Mechanical Engineering Advisory Committee

Advisor Name Title Knight, Charles Eugene Committee Chair Mitchiner, Reginald G. Committee Member Thangjitham, Surot Committee Member West, Robert L. Jr. Committee Member Wicks, Alfred L. Committee Member Keywords

- stress error indicator
- finite element method
- error estimate
- p-refinement
- p-version
Date of Defense 1998-04-30 Availability unrestricted AbstractAutomation of finite element analysis based on a fully adaptivep-refinement procedure can reduce the magnitude of discretization error to the desired accuracy with minimum computational cost and computer resources. This study aims to 1) develop an efficientp-refinement procedure with a non-uniformpanalysis capability for solving 2-D and 3-D elastostatic mechanics problems, and 2) introduce a stress error estimate. An element-by-element algorithm that decides the appropriate order for each element, where element orders can range from 1 to 8, is described. Global and element data structures that manage the complex data generated during the refinement process are introduced. These data structures are designed to match the concept of object-oriented programming where data and functions are managed and organized simultaneously.The stress error indicator introduced is found to be more reliable and to converge faster than the error indicator measured in an energy norm called the residual method. The use of the stress error indicator results in approximately 20% fewer degrees of freedom than the residual method. Agreement of the calculated stress error values and the stress error indicator values confirms the convergence of final stresses to the analyst. The error order of the stress error estimate is postulated to be one order higher than the error order of the error estimate using the residual method. The mapping of a curved boundary element in the working coordinate system from a square-shape element in the natural coordinate system results in a significant improvement in the accuracy of stress results.

Numerical examples demonstrate that refinement using non-uniform

panalysis is superior to uniformpanalysis in the convergence rates of output stresses or related terms. Non-uniformpanalysis uses approximately 50% to 80% less computational time than uniformpanalysis in solving the selected stress concentration and stress intensity problems. More importantly, the non-uniformprefinement procedure scales the number of equations down by 1/2 to 3/4. Therefore, a small scale computer can be used to solve equation systems generated using high orderp-elements. In the calculation of the stress intensity factor of a semi-elliptical surface crack in a finite-thickness plate, non-uniformpanalysis used fewer degrees of freedom than a conventionalh-type element analysis found in the literature.Files

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