Accession Number : ADA067196

Title :   Singular Plastic Element: NASTRAN Implementation and Application.

Descriptive Note : Technical rept.,

Corporate Author : ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND WATERVLIET NY BENET WEAPONS LAB

Personal Author(s) : Hussain,M. A. ; Pu,S. L. ; Lorensen,W. E.

Report Date : DEC 1978

Pagination or Media Count : 30

Abstract : The elastic and plastic singularities near a crack tip are obtained from higher order isoparametric elements. This is simply accomplished by collapsing the quadrilateral element into a triangular element and by judicious choice of adjacent mid-side nodes. Specifically for the cubic element, the elastic singularity is obtained by placing the mid-side nodes adjacent to the crack tip at 1/9th and 4/9th locations. The plastic singularity is constructed using the sliding node concept. These elements have been implemented in NASTRAN as user dummy elements.

Descriptors :   *FINITE ELEMENT ANALYSIS, *ELASTIC PROPERTIES, *CRACK PROPAGATION, *PLASTIC PROPERTIES, COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, CRACKS, TEST METHODS, STRAIN(MECHANICS), FRACTURE(MECHANICS), LINEARITY.

Subject Categories : MECHANICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE

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