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- W4247153669 abstract "Predictions are made for the size effect on strength of a random, isotropic two-phase composite. Each phase is treated as an isotropic, elastic–plastic solid, with a response described by a modified deformation theory version of the Fleck–Hutchinson strain gradient plasticity formulation (Fleck and Hutchinson, J. Mech. Phys. Solids 49 (2001) 2245). The essential feature of the new theory is that the plastic strain tensor is treated as a primary unknown on the same footing as the displacement. Minimum principles for the energy and for the complementary energy are stated for a composite, and these lead directly to elementary bounds analogous to those of Reuss and Voigt. For the case of a linear hardening solid, Hashin–Shtrikman bounds and self-consistent estimates are derived. A non-linear variational principle is constructed by generalising that of Ponte Castañeda (J. Mech. Phys. Solids 40 (1992) 1757). The minimum principle is used to derive an upper bound, a lower estimate and a self-consistent estimate for the overall plastic response of a statistically homogeneous and isotropic strain gradient composite. Sample numerical calculations are performed to explore the dependence of the macroscopic uniaxial response upon the size scale of the microstructure, and upon the relative volume fraction of the two phases." @default.
- W4247153669 created "2022-05-12" @default.
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- W4247153669 date "2004-05-01" @default.
- W4247153669 modified "2023-10-14" @default.
- W4247153669 title "Bounds and estimates for the effect of strain gradients upon the effective plastic properties of an isotropic two-phase composite" @default.
- W4247153669 doi "https://doi.org/10.1016/s0022-5096(04)00024-9" @default.
- W4247153669 hasPublicationYear "2004" @default.
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