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oai:www.ideals.illinois.edu:2142/83853 2023-07-11 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Sofronis, Petros Ahn, Deok Chan 2015-09-25T21:12:27Z 2015-09-25T21:12:27Z 10000-01-01 2006 2006 The effect of hydrogen interstitials on void growth and coalescence has been investigated during crack propagation in materials which fail by ductile processes in the presence of hydrogen. First the hydrogen effect on dislocation mobility and lattice dilatation was considered to establish the material constitutive law. Simulations in a unit cell containing a void were carried out to devise traction-separation laws reflecting the hydrogen effect on void growth and coalescence over a range of stress triaxialities representative of the material constraint ahead of a crack tip. A triaxiality/hydrogen-informed cohesive element was devised to simulate the effect of the microscopic void response in the fracture process zone on the macroscopic crack propagation under plane strain small scale yielding conditions. Numerical results from crack growth simulations in the A533B pressure vessel steel indicate that hydrogen reduces both the initiation toughness and eliminates the tearing resistance of the material. Made available in DSpace on 2015-09-25T21:12:27Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3242777.pdf: 5204852 bytes, checksum: 7031f520dc5adbb144a4391e4bd7a021 (MD5) Previous issue date: 2006 Embargo set by: Seth Robbins for item 85134 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 271 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2006. http://hdl.handle.net/2142/83853 (MiAaPQ)AAI3242777 eng Engineering, Mechanical Mechanisms of Ductile Fracture: Void Growth by Dislocation -Loop Emission and Hydrogen-Assisted Crack Propagation text Mechanical Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.