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By Grant Steven, Qing Li, Zhongpu Zhang

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In order to accommodate Applied Mechanics and Materials Vol. 553 37 the increased normal pressure the molecules initially tilt. As the pressure increases further they bend and tilt at the same time. Figure 2. Film thickness as a function of normal pressure for C14 and C15 hydrated SAM-Au contacts. For hydrated C14 monolayers, two regimes can be observed. In regime I up to the pressure of ~700-900MPa, the tilt angle increases at a larger rate. 1GPa. The continuous decrease seen for the film thickness (Figure 2) beyond 1100 MPa, indicates further compression takes place under different modes of structural changes such as chain deformation and penetration of water molecules.

The model parameters are calibrated using the first cycle stress-strain curve and used to predict the mechanical response to the cyclic saturation of AA7075. The results indicate that the proposed TBRVE CP finite element model can effectively capture the BE at the grain level. Introduction The Bauschinger effect (BE) is a common phenomenon that can be found in most polycrystalline metals [1, 2]. Its effect can be seen on stress-strain curves as the absolute value of the yield stress drops during reversal loading.

This was probably due to “unpredictable” heterogeneities which are not correlated with GB potential energy. Overall, Figs. 5 & 6 indicate that the primary influence of the GBs on the plastic deformation response is their contribution to the dominant dislocation slip systems, rather than acting as barriers or pinning sites. Simulation Case 3: GB penetration threshold To study the effect of GBs on dislocation momentum in FCC metals with meso-scale simulations, a model must be applied to predict whether the GBs will act as a barrier or as a “penetrable” source of slip re-orientation.

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