Bounding the plastic strength of polycrystalline voided solids by linear-comparison homogenization techniques

Author:

Ramos Nervi Juan E.12,Idiart Martín I.13

Affiliation:

1. Departamento de Aeronáutica, Facultad de Ingeniería, Universidad Nacional de La Plata, Avda. 1 esq. 47, La Plata B1900TAG, Argentina

2. Nucleoeléctrica Argentina S.A., Arribeños 3619, Ciudad Autónoma de Buenos Aires C1429BKQ, Argentina

3. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), CCT La Plata, Calle 8 No 1467, La Plata B1904CMC, Argentina

Abstract

The elastoplastic response of polycrystalline voided solids is idealized here as rigid-perfectly plastic. Bounds on the macroscopic plastic strength for prescribed microstructural statistics and single-crystal strength are computed be means of a linear-comparison homogenization technique developed by Idiart & Ponte Castañeda (2007 Proc. R. Soc. A 463 , 907–924. ( doi:10.1098/rspa.2006.1797 )). Hashin–Shtrikman (HS) and Self-Consistent (SC) results in the form of yield surfaces are reported for cubic and hexagonal polycrystals with isotropic texture and varying degrees of crystal anisotropy. In all cases, the surfaces are smooth, closed and convex. Improvements over earlier linear-comparison bounds of up to 40% are found at high-stress triaxialities. New HS results can even be sharper than earlier SC results for some material systems. In the case of deficient crystals, the SC results assert that voided aggregates of crystals with four independent systems can accommodate arbitrary deformations, those with three independent systems can dilate but not distort, and those with fewer than three independent systems cannot deform at all. We report the sharpest bounds available to date for all classes of material systems considered.

Funder

Universidad Nacional de La Plata

Agencia Nacional de Promoción Científica y Tecnológica

Publisher

The Royal Society

Subject

General Physics and Astronomy,General Engineering,General Mathematics

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