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Title: New self-consistent homogenization for thermo-elastic polycrystals with imperfect interfaces

Journal Article · · Mechanics of Materials

Here we present a new thermo-elastic self-consistent formulation to calculate the thermo-mechanical response of polycrystalline aggregates with imperfect interfaces. The new model is based on an improved treatment of the effect of imperfect interfaces on the micromechanical response of the grains compared to pre-existing models. New expressions/algorithms are derived for the effective elastic and thermal properties, localization relations, and calculation of intragranular field fluctuations. In addition, derivation of a novel integral equation for the strain field in a heterogeneous elastic medium subjected to arbitrary thermal strain field and displacement jumps is presented. The new model is applied to study the effective thermo-elastic properties and average field fluctuations as a function of the interface properties for imperfectly-bonded triaminotrinitrobenzene (TATB) polycrystalline granular aggregates. The proposed formulation is general in the sense that it can be extended to other material systems and deformation regimes that require a proper consideration of the effect of imperfect interface properties on the material's thermo-mechanical response.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233218CNA000001; 20180441ER; 20200182DR
OSTI ID:
1726215
Alternate ID(s):
OSTI ID: 1809494
Report Number(s):
LA-UR-20-24726
Journal Information:
Mechanics of Materials, Vol. 155, Issue C; ISSN 0167-6636
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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