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oai:www.ideals.illinois.edu:2142/83524 2023-07-11 col_2142_5131 col_2142_14770 com_2142_5130 com_2142_3518 com_2142_234

Pecknold, David A. Ha, Christopher Chul 2015-09-25T21:05:25Z 2015-09-25T21:05:25Z 10000-01-01 2001 2001 This study is directed toward the development of a simple material model that can characterize ductile fracture in ferritic steels and that can be used in practical engineering problems. Ductile fracture occurs by a sequential process of nucleation, growth and coalescence of microvoids or microcracks. However, the model uses a continuum approach that can capture the global effect of ductile fracture behavior. It consists of two uncoupled material models; an elastic-damaging model that employs continuum damage mechanics and a von Mises plasticity model. The elastic-damaging model is based on the assumption that damage occurs due only to hydrostatic tension, and this, combined with the von Mises plasticity model, allows a simple formulation of the proposed model. Parameters required by the proposed model are determined by calibrating against experimental data for a specific material. The parameters for the elastic-damaging model depend on the spatial distribution of hydrostatic tension, and are determined by a calibration procedure that utilizes axisymmetric notched specimens. The proposed model is implemented in ABAQUS using a user-defined subroutine, i.e. UMAT. Applications to four-point plane strain bending specimens with a key hole notch and to double-tee circular hollow section tubular joints are presented. The proposed model appears to be capable of simulating, with reasonable accuracy, the failure of metal structures due to ductile fracture. Made available in DSpace on 2015-09-25T21:05:25Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9996636.pdf: 6458729 bytes, checksum: a464539fe4775386cfa74053796b1ced (MD5) Previous issue date: 2001 Embargo set by: Seth Robbins for item 84805 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 140 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2001. http://hdl.handle.net/2142/83524 (MiAaPQ)AAI9996636 eng Engineering, Metallurgy Elastic-Damaging Plasticity Model for Ductile Fracture text Civil Engineering Civil Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.