Hp-Meshless Cloud Method for Dynamic Fracture in Fluid Structure Interaction

摘要

The project aimed at the development of a new meshless technology, and computer code based on, for the analysis of crack propagation in dynamics fluid structure interaction. In the meshless formulation crack propagation is not restricted by the existence of domain discretisation (meshless method) and suitable error estimators combined with adaptively assure highly accurate solution. A general purpose, three dimensional meshless analysis code, called PHLEXcrack has been developed, tested and delivered to Navy. At present the code is capable of analysis of static and dynamic structure responses including the underwater shock analysis (provided via interface to 'U.S.A.' code) with dynamic crack propagation through the selected part of the domain. Crack propagation criteria for brittle materials is provided based on least square fit method and energy release rate data. Users can specify own routines for alternate fracture criteria and crack propagation prediction. Full suite of classical finite elements (comparable to basic Nastran capabilities), together with hp-adaptive volume finite elements, and 3 dimensional meshless formulation are implemented and can be freely mixed to obtain efficiently the solution of displacements, stresses and fracture measures in the structure. Nonlinear capabilities of the code consist of large deformations, nonlinear materials. (incl. plasticity) and contact with rigid surfaces.