| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and system for simulating a beam-to-surface contact in finite element analysis (FEA). SOLUTION: An FEA model has at least one beam element and at least one surface mesh. The surface mesh includes a plurality of two-dimensional finite elements having arbitrary mesh density. A minimum characteristic length (CL) of the surface mesh is calculated. One or more interior points are defined for those beam elements with length longer than CL. For every nodal point, a parametric coordinate between 0 and 1 is established and kept constant throughout the FEA analysis. Distributed nodal masses are used for calculating a stiffness value for calculating nodal force to resist penetration. Initial penetration with the surface mesh at each nodal point along the beam element is compensated with a set of displacements subtracting from the initial nodal displacements, such that the compensational forces remain at zero as the nodal point's initial interpenetration decreases. COPYRIGHT: (C)2011,JPO&INPIT
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