Gradient Plasticity Model and its Implementation into MARMOT

Technical Report · Thu Aug 01 04:00:00 EDT 2013

DOI:https://doi.org/10.2172/1133998· OSTI ID:1133998

Barker, Erin I. ^[1]; Li, Dongsheng ^[1]; Zbib, Hussein M. ^[1]; Sun, Xin ^[1]

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1. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

The influence of strain gradient on deformation behavior of nuclear structural materials, such as body-centered cubic (bcc) iron alloys has been investigated. We have developed and implemented a dislocation based strain gradient crystal plasticity material model. A mesoscale crystal plasticity model for inelastic deformation of metallic material, bcc steel, has been developed and implemented numerically. Continuum Dislocation Dynamics (CDD) with a novel constitutive law based on dislocation density evolution mechanisms was developed to investigate the deformation behaviors of single crystals, as well as polycrystalline materials by coupling CDD and crystal plasticity (CP). The dislocation density evolution law in this model is mechanism-based, with parameters measured from experiments or simulated with lower-length scale models, not an empirical law with parameters back-fitted from the flow curves.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Nuclear Energy Advanced Modeling and Simulation (NEAMS)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1133998
• Report Number(s): PNNL--22702; NT0108020
• Country of Publication: United States
• Language: English

Related Subjects

MARMOT
continuous dislocation dynamics
crystal plasticity
gradient plasticity