LOCAL TENSOR RADIATION CONDITIONS FOR ELASTIC WAVES

✍ Scribed by S. KRENK; P.H. KIRKEGAARD

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 649 KB
• Volume: 247
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.2001.3789

✦ Synopsis

A local boundary condition is formulated, representing radiation of elastic waves from an arbitrary point source. The boundary condition takes the form of a tensor relation between the stress at a point on an arbitrarily oriented section and the velocity and displacement vectors at the point. The tensor relation generalizes the traditional normal incidence impedance condition by accounting for the angle between wave propagation and the surface normal and by including a generalized sti!ness term due to spreading of the waves. The e!ectiveness of the local tensor radiation condition is demonstrated by detailed "nite element time and frequency analysis of a concentrated force in in"nite three-dimensional space, and by a time analysis of a pulse load in a two-dimensional underground gallery.

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