The Implementation of a Nonreflecting Boundary into the SAMSON2 Code
Abstract
A nonreflecting boundary has been implemented into a dynamic explicit finite element code called SAMSON2. The nonreflecting boundary is a practical application of a viscous boundary developed by Lysmer and Kuhlemeyer. The basic principle involves an introduction of a set of dissipative stresses applied normal to and tangentially along the boundary which match the impedances of the interior of the mesh. The original viscous boundary which match the impedances of the interior of the mesh. The original viscous boundary scheme is limited to a plane elastic isotropic medium. This study expanded the versatility of the viscous boundary by including a medium that is axisymmetric, inelastic and/or anisotropic. A series of tests were conducted to determine the effectiveness of the nonreflecting boundary under a variety of circumstances. The implemented nonreflecting boundary performed very well for normal values of Poisson's ratio and for axisymmetric problems. A decrease in the effectiveness was noticed for materials with high values of Poisson's ratio and when the nonreflecting boundary is placed too close to the axis of symmetry. Finite elements, Dynamic analysis, Viscous boundaries, Transmitting boundaries.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1988
- Accession Number
- ADA203394
Entities
People
- B. L. Haverson
- H. C. Sorensen
Organizations
- Washington State University