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Title: A degradation function consistent with Cocks–Ashby porosity kinetics

Abstract

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.

Authors:
 [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1438703
Report Number(s):
LLNL-JRNL-730381
Journal ID: ISSN 0376-9429
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Fracture
Additional Journal Information:
Journal Volume: 209; Journal Issue: 1-2; Journal ID: ISSN 0376-9429
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE; Degradation function; Porosity; Damage; Ductile fracture; Strain-rate dependence

Citation Formats

Moore, John A. A degradation function consistent with Cocks–Ashby porosity kinetics. United States: N. p., 2017. Web. doi:10.1007/s10704-017-0247-6.
Moore, John A. A degradation function consistent with Cocks–Ashby porosity kinetics. United States. doi:10.1007/s10704-017-0247-6.
Moore, John A. Sat . "A degradation function consistent with Cocks–Ashby porosity kinetics". United States. doi:10.1007/s10704-017-0247-6. https://www.osti.gov/servlets/purl/1438703.
@article{osti_1438703,
title = {A degradation function consistent with Cocks–Ashby porosity kinetics},
author = {Moore, John A.},
abstractNote = {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.},
doi = {10.1007/s10704-017-0247-6},
journal = {International Journal of Fracture},
number = 1-2,
volume = 209,
place = {United States},
year = {2017},
month = {10}
}

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