Published: Jan 1983
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The specialized finite-element program, PAPST (plastic axisymmetric and planar structures), has been developed by the Navy for analysis of elastic-plastic crack problems. After a number of years of PAPST development, internal usage [1,2]3 and refinement, preliminary documentation  has now been issued for public release. PAPST includes a finite strain treatment  (with a small strain option) for incremental (J2) plasticity. Both power-hardening and multilinear models for uniaxial response are available. The singular core element  can be employed to enforce the Hutchinson-Rice-Rosengren crack-tip singularity for power-hardening materials [6, 7] while the enriched element  may be used to model crack-tip response for the multilinear material model. For crack problems, both path values for the J-integral and values based on the amplitude of the singular solution can be automatically computed.
PAPST has been used within the Navy research and development community to evaluate response of specimens of varying size, geometries, and material properties. Results for planar and axisymmetric configurations are presented to demonstrate the applications of PAPST to elastic-plastic crack problems.
crack, enriched elements, finite element, fracture mechanics, J-integral, nodal release, plasticity, tearing modulus, elastic-plastic fracture
Consultant, Arthur D. Little, Inc., Cambridge, Mass.
David W. Taylor Naval Ship R&D Center, Bethesda, Md.