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When Chen et al. (2015, Acta Mater. 87, 78-85) investigated the deformationbehavior of oligocrystalline gold microwires with varying diameters in bothuniaxial tension and torsion, contrary size effects were observed for thedifferent load cases. In accompanying microstructural studies it was found,that the microwires of different thickness reveal distinctive differences ingrain size and texture, respectively. As a consequence, a significant influenceof these microstructural variations on the determined size effects was assumed.However, within the frame of their work, a direct confirmation could only bepresented for the effect of the grain size. In the present work, thesize-dependent mechanical response of the microwires is modeled with a gradientplasticity theory. By finite element simulations of simplified grainaggregates, the influence of the texture on the size effects is investigatedunder both loading conditions. It is shown that the experimentally observedcontrary size effects can only be reproduced when taking into account theindividual textures of the microwires of different thickness within themodeling.

Modeling contrary size effects of tensile- and torsion-loaded oligocrystalline gold microwires