A degradation function consistent with Cocks–Ashby porosity kinetics

Journal Article · 14 October 2017 · International Journal of Fracture

DOI: https://doi.org/10.1007/s10704-017-0247-6 · OSTI ID:1438703

Moore, John A. ^[1]

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1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Here, the load carrying capacity of ductile materials degrades as a function of porosity, stress state and strain-rate. The effect of these variables on porosity kinetics is captured by the Cocks–Ashby model; however, the Cocks–Ashby model does not account for material degradation directly. This work uses a yield criteria to form a degradation function that is consistent with Cocks–Ashby porosity kinetics and is a function of porosity, stress state and strain-rate dependence. Approximations of this degradation function for pure hydrostatic stress states are also explored.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC52-07NA27344
• OSTI ID: 1438703
• Report Number(s): LLNL-JRNL-730381
• Journal Information: International Journal of Fracture, Vol. 209, Issue 1-2; ISSN 0376-9429
• Publisher: SpringerCopyright Statement
• Country of Publication: United States
• Language: English