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.

Report Date:

1994-12-30

Pagination or Media Count:

23.0

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