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Title: Predicting grid-size-dependent fracture strains of DP980 with a microstructure-based post-necking model

Ductile fracture is a local phenomenon, and it is well established that fracture strain levels depend on both stress triaxiality and the resolution (grid size) of strain measurements. Two-dimensional plane strain post-necking models with different model sizes are used in this paper to predict the grid-size-dependent fracture strain of a commercial dual-phase steel, DP980. The models are generated from the actual microstructures, and the individual phase flow properties and literature-based individual phase damage parameters for the Johnson–Cook model are used for ferrite and martensite. A monotonic relationship is predicted: the smaller the model size, the higher the fracture strain. Thus, a general framework is developed to quantify the grid-size-dependent fracture strains for multiphase materials. In addition to the grid-size dependency, the influences of intrinsic microstructure features, i.e., the flow curve and fracture strains of the two constituent phases, on the predicted fracture strains also are examined. Finally, application of the derived fracture strain versus model size relationship is demonstrated with large clearance trimming simulations with different element sizes.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [2]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Physical and Computational Sciences Directorate
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Physical and Computational Sciences Directorate; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
International Journal of Fracture
Additional Journal Information:
Journal Volume: 207; Journal Issue: 2; Journal ID: ISSN 0376-9429
Publisher:
Springer
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; size-dependency; damage/fracture strain; plane strain post-necking model; Johnson-Cook model; DP980; individual phase properties
OSTI Identifier:
1376483

Cheng, G., Hu, X. H., Choi, K. S., and Sun, X.. Predicting grid-size-dependent fracture strains of DP980 with a microstructure-based post-necking model. United States: N. p., Web. doi:10.1007/s10704-017-0229-8.
Cheng, G., Hu, X. H., Choi, K. S., & Sun, X.. Predicting grid-size-dependent fracture strains of DP980 with a microstructure-based post-necking model. United States. doi:10.1007/s10704-017-0229-8.
Cheng, G., Hu, X. H., Choi, K. S., and Sun, X.. 2017. "Predicting grid-size-dependent fracture strains of DP980 with a microstructure-based post-necking model". United States. doi:10.1007/s10704-017-0229-8. https://www.osti.gov/servlets/purl/1376483.
@article{osti_1376483,
title = {Predicting grid-size-dependent fracture strains of DP980 with a microstructure-based post-necking model},
author = {Cheng, G. and Hu, X. H. and Choi, K. S. and Sun, X.},
abstractNote = {Ductile fracture is a local phenomenon, and it is well established that fracture strain levels depend on both stress triaxiality and the resolution (grid size) of strain measurements. Two-dimensional plane strain post-necking models with different model sizes are used in this paper to predict the grid-size-dependent fracture strain of a commercial dual-phase steel, DP980. The models are generated from the actual microstructures, and the individual phase flow properties and literature-based individual phase damage parameters for the Johnson–Cook model are used for ferrite and martensite. A monotonic relationship is predicted: the smaller the model size, the higher the fracture strain. Thus, a general framework is developed to quantify the grid-size-dependent fracture strains for multiphase materials. In addition to the grid-size dependency, the influences of intrinsic microstructure features, i.e., the flow curve and fracture strains of the two constituent phases, on the predicted fracture strains also are examined. Finally, application of the derived fracture strain versus model size relationship is demonstrated with large clearance trimming simulations with different element sizes.},
doi = {10.1007/s10704-017-0229-8},
journal = {International Journal of Fracture},
number = 2,
volume = 207,
place = {United States},
year = {2017},
month = {7}
}