METHODS AND SYSTEMS OF ENGINEERING ANALYSIS USING HYBRID APPROACH OF FINITE ELEMENT METHOD (FEM) AND ADAPTIVE SMOOTHED PARTICLE HYDRODYNAMICS (SPH)

摘要

PPROBLEM TO BE SOLVED: To disclose systems and methods of computer aided engineering analysis using hybrid approach of a finite element method (FEM) and an adaptive smoothed particle hydrodynamics (SPH). PSOLUTION: According to one aspect, a computer-aided engineering analysis is performed to simulate an impact event between structures. A FEM grid model is created to represent the structures using a plurality of solid elements which represent geometrical arrangement and material properties. Once a contact between two structures is resulted into a material or structural failure according to predefined material constitutive equation, solid elements representing the failed portion of the structure are removed. Each failed solid element is then replaced by a plurality of particles to be analyzed using the SPH analysis. The particles replacing the failed element inherit all of the states and properties of the failed element, such as location, mass, velocity, acceleration, etc. The replacement is conducted according to the principles of mass, momentum and energy conservation. PCOPYRIGHT: (C)2009,JPO&INPIT