Mechanical response of nanoporous gold

Nanoporous Gold—Testing Macro-scale Samples to Probe Small-scale Mechanical Behavior

“…Several numerical simulation studies have used that process to create microstructures that closely resemble experimental NPG. [25,36,48] It is therefore remarkable that spinodal structures with unequal phase fractions are known to disintegrate during coarsening. [49,50] For NPG this implies that networks with low ϕ may exhibit a reduced connectivity density of their load-bearing paths, which would make them anomalously weak and compliant.…”

Size effects on tensile and compressive strengths in metallic glass nanowires

“…The concept of surface stress has been adopted to interpret the size effects on mechanical properties such as elastic modulus (Cuenot et al, 2004, Jing et al, 2006, Possion's Ratio (Dingreville et al, 2005), effective stiffness (Miller and Shenoy, 2000) and resonant properties (Park andKlein, 2008, Yi andDuan, 2009). In crystalline metals, the influences of surface stress on yield behaviors , Gioia and Dai, 2006, Zhang et al, 2008, Yang et al, 2009, Farkas et al, 2013, phase transformation (Diao et al, 2003), shape memory effect and pseudo-elastic behavior (Liang and Zhou, 2006) have been well documented. Our atomistic simulations have provided important insights that the SZTs always nucleate from free surface at the initial yielding, and the plastic deformation is homogeneous due to the uniform distribution of STZs in the nanowires.…”

Numerical analysis of elastic and elastoplastic behavior of interpenetrating phase composites

“…Crowson et al [26,27] probed the dominant mechanisms for the geometric relaxation of bicontinuous nanoporous metal based on the phase field method. Farkas et al [28] and Sun et al [29] studied the mechanical properties of nanoporous gold with bicontinuous structure based on the phase field method. As Section 1 mentioned, the existing FE models are either too simple to characterize the IPCs, or so expensive to obtain based on Xray CT scan.…”

“…To better mimic this process, a random porous model should be built at first, and then fill the porous model with another phase to obtain the whole IPC model. The phase field method has been usually employed to characterize the bicontinuous structures [22,[26][27][28][29]. Sun et al [22] established a bicontinuous structure based on the phase field method and MDs was implemented to obtain the mechanical behaviors of nano-IPC.…”