TY - JOUR
T1 - On hydrogen-induced plastic flow localization during void growth and coalescence
AU - Ahn, D. C.
AU - Sofronis, P.
AU - Dodds, R. H.
N1 - Funding Information:
The authors gratefully acknowledge financial support from the NASA Marshall Space Flight Center (Grant NAG 8-1751; Mr. Doug Wells, Technical Monitor), the National Science Foundation (Grant DMR 0302470), and the US DoE (Grant GO15045, Mr. Mark Paster, Technical Monitor).
PY - 2007/11
Y1 - 2007/11
N2 - Hydrogen-enhanced localized plasticity (HELP) is recognized as a viable mechanism of hydrogen embrittlement. A possible way by which the HELP mechanism can bring about macroscopic material failure is through hydrogen-induced accelerated void growth and coalescence. Assuming a periodic array of spherical voids loaded axisymmetrically, we investigate the hydrogen effect on the occurrence of plastic flow localization upon void growth and its dependence on macroscopic stress triaxiality. Under a macroscopic stress triaxiality equal to 1 and prior to void coalescence, the finite element calculation results obtained with material data relevant to A533B steel indicate that a hydrogen-induced localized shear band forms at an angle of about 45{ring operator} from the axis of symmetry. At triaxiality equal to 3, void coalescence takes place by accelerated hydrogen-induced localization of plasticity mainly in the ligament between the voids. Lastly, we discuss the numerical results within the context of experimental observations on void growth and coalescence in the presence of hydrogen.
AB - Hydrogen-enhanced localized plasticity (HELP) is recognized as a viable mechanism of hydrogen embrittlement. A possible way by which the HELP mechanism can bring about macroscopic material failure is through hydrogen-induced accelerated void growth and coalescence. Assuming a periodic array of spherical voids loaded axisymmetrically, we investigate the hydrogen effect on the occurrence of plastic flow localization upon void growth and its dependence on macroscopic stress triaxiality. Under a macroscopic stress triaxiality equal to 1 and prior to void coalescence, the finite element calculation results obtained with material data relevant to A533B steel indicate that a hydrogen-induced localized shear band forms at an angle of about 45{ring operator} from the axis of symmetry. At triaxiality equal to 3, void coalescence takes place by accelerated hydrogen-induced localization of plasticity mainly in the ligament between the voids. Lastly, we discuss the numerical results within the context of experimental observations on void growth and coalescence in the presence of hydrogen.
UR - http://www.scopus.com/inward/record.url?scp=35548975883&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=35548975883&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2006.08.047
DO - 10.1016/j.ijhydene.2006.08.047
M3 - Article
AN - SCOPUS:35548975883
SN - 0360-3199
VL - 32
SP - 3734
EP - 3742
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 16
ER -
