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Title: A micromechanical framework and modified self-consistent homogenization scheme for the thermoelasticity of porous bonded-particle assemblies

Abstract

Thermoelasticity of porous bonded-particle assemblies is modeled within a micromechanical framework that considers damage at the inter-particle interfaces. Connections between void space and interface damage are developed and incorporated into a modified self-consistent homogenization (M-SCH) scheme that includes a contribution to the mean strain field from local displacement discontinuities over interfacial void spaces. The M-SCH scheme is developed for particles of a general ellipsoidal shape with anisotropic elastic and thermal expansion properties. Two types of porosity are distinguished: (1) dispersed inter-particle porosity and (2) isolated porosity. A means of separating out the relative contributions of each type of porosity to the homogenization scheme is provided, and an explicit expression is obtained for an effective damaged interphase thickness as a function of the dispersed porosity and the particle morphology. Numerical examples are provided for quartz bonded-particle assemblies in order to examine the influence of the porosity type on the predicted elastic moduli. The model is also calibrated to the neutron diffraction measurements provided by Yeager et al. (2016) of triclinic TATB crystal lattice orientation (texture) and lattice strain induced under thermal loading. The model simulations of lattice strain are compared with the measurements, and the predicted statistical distributions of inter-particle displacementmore » discontinuities and contact tractions within the assembly are examined.« less

Authors:
 [1]; ORCiD logo [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1463540
Alternate Identifier(s):
OSTI ID: 1548777
Report Number(s):
LA-UR-17-22811
Journal ID: ISSN 0020-7683
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Solids and Structures
Additional Journal Information:
Journal Volume: 139-140; Journal Issue: C; Journal ID: ISSN 0020-7683
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Bennett, K. C., Luscher, D. J., Buechler, M. A., and Yeager, J. D. A micromechanical framework and modified self-consistent homogenization scheme for the thermoelasticity of porous bonded-particle assemblies. United States: N. p., 2018. Web. doi:10.1016/j.ijsolstr.2018.02.001.
Bennett, K. C., Luscher, D. J., Buechler, M. A., & Yeager, J. D. A micromechanical framework and modified self-consistent homogenization scheme for the thermoelasticity of porous bonded-particle assemblies. United States. doi:10.1016/j.ijsolstr.2018.02.001.
Bennett, K. C., Luscher, D. J., Buechler, M. A., and Yeager, J. D. Fri . "A micromechanical framework and modified self-consistent homogenization scheme for the thermoelasticity of porous bonded-particle assemblies". United States. doi:10.1016/j.ijsolstr.2018.02.001. https://www.osti.gov/servlets/purl/1463540.
@article{osti_1463540,
title = {A micromechanical framework and modified self-consistent homogenization scheme for the thermoelasticity of porous bonded-particle assemblies},
author = {Bennett, K. C. and Luscher, D. J. and Buechler, M. A. and Yeager, J. D.},
abstractNote = {Thermoelasticity of porous bonded-particle assemblies is modeled within a micromechanical framework that considers damage at the inter-particle interfaces. Connections between void space and interface damage are developed and incorporated into a modified self-consistent homogenization (M-SCH) scheme that includes a contribution to the mean strain field from local displacement discontinuities over interfacial void spaces. The M-SCH scheme is developed for particles of a general ellipsoidal shape with anisotropic elastic and thermal expansion properties. Two types of porosity are distinguished: (1) dispersed inter-particle porosity and (2) isolated porosity. A means of separating out the relative contributions of each type of porosity to the homogenization scheme is provided, and an explicit expression is obtained for an effective damaged interphase thickness as a function of the dispersed porosity and the particle morphology. Numerical examples are provided for quartz bonded-particle assemblies in order to examine the influence of the porosity type on the predicted elastic moduli. The model is also calibrated to the neutron diffraction measurements provided by Yeager et al. (2016) of triclinic TATB crystal lattice orientation (texture) and lattice strain induced under thermal loading. The model simulations of lattice strain are compared with the measurements, and the predicted statistical distributions of inter-particle displacement discontinuities and contact tractions within the assembly are examined.},
doi = {10.1016/j.ijsolstr.2018.02.001},
journal = {International Journal of Solids and Structures},
number = C,
volume = 139-140,
place = {United States},
year = {2018},
month = {2}
}

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