Journal
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
Volume 194, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmecsci.2020.106209
Keywords
Multiaxial fracture; Advanced high strength steels; Stress state dependence; Microstructure; Representative volume element
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Funding
- NIST [60NANB15D284]
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The study investigated the stress state dependent fracture behavior of DP600 using a finite element model, revealing the significant role of microstructural heterogeneity in material fracture behavior. Simulations showed that microcracks always initiate from martensite in DP600, while the propagation of cracks or initiation of new cracks depend on stress state.
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.
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