Accession Number : ADA289531

Title :   Addressing Tension Instability in SPH Methods.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Dyka, C. T. ; Ingel, R. P.

PDF Url : ADA289531

Report Date : 30 DEC 1994

Pagination or Media Count : 23

Abstract : Smoothed particle hydrodynamics (SPH) has the potential to be an important method for structural analysis. However, the SPH method is currently plagued by tension instability. In this work, a new unconventional approach is introduced, in which the stresses are calculated at points other than the SPH nodes, to address this difficulty. This algorithm is implemented into a one dimensional (1D) program called SPH1D. In addition, objective stress rate calculations are discussed and specialized to 1D applications. The results from applying the unconventional approach to a simple bar are very encouraging. The bar holds together in tension and compares quite well to a finite element analysis.

Descriptors :   *TENSION, *HYDRODYNAMICS, COMPUTER PROGRAMS, ALGORITHMS, IMPACT, STRESS ANALYSIS, FINITE ELEMENT ANALYSIS, STRUCTURAL ANALYSIS, DEFORMATION, TENSILE STRESS, DISPLACEMENT, MODULUS OF ELASTICITY, FRACTURE(MECHANICS), WAVE PROPAGATION, INTERPOLATION, INSTABILITY, LAGRANGIAN FUNCTIONS.

Subject Categories : Fluid Mechanics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE