TY - JOUR
T1 - Identification of stress state dependent fracture micromechanisms in DP600 through representative volume element modeling
AU - Qin, Shipin
AU - Beese, Allison M.
N1 - Publisher Copyright:
© 2020
PY - 2021/3/15
Y1 - 2021/3/15
N2 - The stress state dependent fracture behavior of DP600 was investigated using a representative volume element (RVE) based finite element model. To simulate fracture at the microscale, fracture models for ferrite and martensite were incorporated into the RVE, which was loaded under seven stress states. To compare the simulated damage accumulation and eventual failure in the RVE with experimentally measured continuum-based strain to failure, five RVE-level failure criteria are presented, and their ability to predict the continuum-level stress state dependent fracture strain of the material is discussed. The microstructural heterogeneity resulted in heterogeneous strain fields, and played a dominant role in the stress state dependent fracture behavior of materials. The simulations showed that in DP600, microcracks initiate from martensite regardless of the global stress state, whereas the propagation of cracks or initiation of new cracks depends on stress state.
AB - The stress state dependent fracture behavior of DP600 was investigated using a representative volume element (RVE) based finite element model. To simulate fracture at the microscale, fracture models for ferrite and martensite were incorporated into the RVE, which was loaded under seven stress states. To compare the simulated damage accumulation and eventual failure in the RVE with experimentally measured continuum-based strain to failure, five RVE-level failure criteria are presented, and their ability to predict the continuum-level stress state dependent fracture strain of the material is discussed. The microstructural heterogeneity resulted in heterogeneous strain fields, and played a dominant role in the stress state dependent fracture behavior of materials. The simulations showed that in DP600, microcracks initiate from martensite regardless of the global stress state, whereas the propagation of cracks or initiation of new cracks depends on stress state.
KW - Advanced high strength steels
KW - Microstructure
KW - Multiaxial fracture
KW - Representative volume element
KW - Stress state dependence
UR - http://www.scopus.com/inward/record.url?scp=85096829676&partnerID=8YFLogxK
U2 - 10.1016/j.ijmecsci.2020.106209
DO - 10.1016/j.ijmecsci.2020.106209
M3 - Article
AN - SCOPUS:85096829676
SN - 0020-7403
VL - 194
JO - International Journal of Mechanical Sciences
JF - International Journal of Mechanical Sciences
M1 - 106209
ER -