Mesh dependence of transverse cracking in laminated metals with nanograined interface layers

Guo, Xiang; Zhang, Wenjun; Zhu, Linli; J, Lu

doi:10.1016/j.engfracmech.2013.04.005

Cited by 20 publications

(6 citation statements)

References 39 publications

(90 reference statements)

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“…Within this framework, the intrinsic CFEM embeds the cohesive elements along all finite element boundaries and will be adopted. Recently we have also used it to investigate the layered stainless steel with NG interface layers and found that its ductility strongly depended on the brittleness and thickness of the NG layer [15][16][17]. The relations between microstructural parameters and fracture toughness can also be established [18].…”

Section: Introductionmentioning

confidence: 99%

The saturation state of strength and ductility of bimodal nanostructured metals

2016

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Bimodal nanostructured metals have ultrahigh strength and good ductility, but their values are highly dependent on the cohesive strength of both phases. To explore this dependence, we apply the strain-gradient plasticity theory to the nanograined phase and a cohesive finite element method to determine the overall fracture process. The results show that when the cohesive strength of both phases reaches certain level, the stress-strain curves will reach a saturation state. This finding points to the significance of designing the cohesive strength to such a critical value so that the maximum strength and ductility could be attained.

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Section: Introductionmentioning

confidence: 99%

The saturation state of strength and ductility of bimodal nanostructured metals

2016

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“…The CFEM has been successfully applied to predict the damage initiation and evolution explicitly. Furthermore, it can model spontaneous multiple crack behavior, so it has been widely used to investigate damage process [38][39][40][41][42][43]. Here, our interest is in the high nonlinearity involving the interaction of multiple microcracks, and thus the CFEM is particularly appealing.…”

Section: Cohesive Finite Element Methodsmentioning

confidence: 99%

“…Our experiments showed that the tensile fatigue-fractured specimen had predominant mode-I cracks. Therefore, we use the following quadratic stress criterion of damage initiation [32,41]:…”

Section: Cohesive Finite Element Methodsmentioning

confidence: 99%

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Local Monte Carlo Method for Fatigue Analysis of Coarse-Grained Metals with a Nanograined Surface Layer

Guo

Sun

Yang

et al. 2018

Metals

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Abstract:The fatigue resistance of coarse-grained (CG) metals can be greatly improved by introducing a nanograined surface layer. In this study, the Weibull distribution is used to characterize the spatially-random fracture properties of specimens under axial fatigue. For the cylindrical solid specimen, the heterogeneity of element sizes may lead to unfavorable size effects in fatigue damage initiation and evolution process. To alleviate the size effects, a three-dimensional cohesive finite element method combined with a local Monte Carlo simulation is proposed to analyze fatigue damage evolution of solid metallic specimens. The numerical results for the fatigue life and end displacement of CG specimens are consistent with the experimental data. It is shown that for the specimens after surface mechanical attrition treatment, damage initiates from the subsurface and then extends to the exterior surface, yielding an improvement in the fatigue life. Good agreement is found between the numerical results for the fatigue life of the specimens with the nanograined layer and experimental data, demonstrating the efficacy and accuracy of the proposed method.

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“…The volume fraction of NT regions has significant influences on the strength and ductility of the CG metals strengthened by NT regions. In general the stress-strain curve of a material can be best used to quantify its strength and ductility [57][58][59]. decrease of the other to a certain degree.…”

Section: Direct Effects Of the Volume Fraction Of Nt Regions At Fixedmentioning

confidence: 99%

The direct and indirect effects of nanotwin volume fraction on the strength and ductility of coarse-grained metals

Guo

Ouyang

Weng

et al. 2016

Materials Science and Engineering: A

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Coarse-grained (CG) metals strengthened by nanotwinned (NT) regions have an excellent combination of high strength and good ductility. In this paper, numerical simulations based on the mechanism-based strain gradient plasticity and the Johnson-Cook failure criterion are carried out to investigate the direct and indirect effects of volume fraction of the NT regions and several other key attributes on the strength and ductility of the CG metal strengthened by NT regions. Our results indicate that twin spacing, shape, distribution, and volume fraction of NT regions all have significant effects, and that, as the volume fraction increases, the roles played by the twin spacing and shape of NT regions also change. At low volume fraction of NT regions, their shape is found to have a significant influence on the overall ductility. As the volume fraction increases, the shape effect on the ductility is found to diminish even though the effect on the strength is noted to continue to enhance. While twin spacing and volume fraction of NT regions have shown different effects on the ductility, the effect of twin spacing always decreases as the volume fraction increases. During the simulations we have also discovered several intrinsic deformation and failure mechanisms through the analysis of microcrack initiation sites and microcrack propagation paths. It is believed that this simulation has revealed significant insights into the roles of volume fraction, twin spacing, shape, and distribution of NT regions on the strength and ductility of this novel class of materials.

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Mesh dependence of transverse cracking in laminated metals with nanograined interface layers

Cited by 20 publications

References 39 publications

The saturation state of strength and ductility of bimodal nanostructured metals

The saturation state of strength and ductility of bimodal nanostructured metals

Local Monte Carlo Method for Fatigue Analysis of Coarse-Grained Metals with a Nanograined Surface Layer

The direct and indirect effects of nanotwin volume fraction on the strength and ductility of coarse-grained metals

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