Accession Number : ADA604968


Title :   Modelling of Specimen Fracture


Descriptive Note : Final rept.


Corporate Author : MARTEC LIMITED HALIFAX (NOVA SCOTIA)


Personal Author(s) : Link, Rick


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a604968.pdf


Report Date : 23 Sep 2013


Pagination or Media Count : 37


Abstract : This report is a summary of the work that has been performed on the implementation of global fracture parameters into a finite element (FE) post-processing computer code. The work is a continuation of a previous study involving the implementation of a micromechanical fracture model into the LS-DYNA user-defined subroutines. Two fracture parameters were identified and implemented into the post-processor: the strain energy release rate, J, and the Weibull stress, sigma w. The calculation of these parameters involved parsing the output data of the selected FE code, LS-DYNA, including element stresses, strain energies, and nodal coordinates and kinematic variables for an arbitrary number of dump times in a specified geometric window. The calculation of J involves the automatic determination of J-integral contours, which was coded into the post-processor. The calculation routines were validated using a linear elastic problem for the J-integral calculator, and Beremin's data for the Weibull stresses. The calculated results were in good agreement with published values. Future work includes the continuing testing and improvement of the post-processor.


Descriptors :   *FRACTURE(MECHANICS) , CANADA , COMPUTER PROGRAMS , FINITE ELEMENT ANALYSIS , J INTEGRALS


Subject Categories : Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE