Improvement of dynamic notch toughness for the Zr 56 Co 28 Al 16 bulk metallic glass by local pre-deformation

Gu, Jian; Zhang, T.W.; Jiao, Zhiming; Wang, Zhi Hua; Ma, Wei; Qiao, J.W.

doi:10.1016/j.jnoncrysol.2017.07.034

Cited by 7 publications

(5 citation statements)

References 43 publications

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“…8a). As has been observed in other studies for quasi-static and dynamic loading conditions [29,30], shear bands guided the fatigue precrack advance off the mode I plane. Though the secondary shear bands were not obvious from the hardness maps, they could be seen from the etched samples and were oriented approximately perpendicular to the primary shear bands (Fig.…”

Section: Role Of Shear Band Orientationsupporting

confidence: 85%

“…This resulted in rejuvenation of the glassy structure, as measured by relaxation enthalpy [28], along with higher toughness and a tortuous crack path [27]. Similarly, studies have used a pre-compression approach to demonstrate how oriented shear bands can guide cracks off the mode I fracture plane to improve notch toughness under both quasi-static and dynamic loading conditions [29,30]. However, the current understanding of how highly oriented preintroduced shear bands interact with cracks to affect the crack propagation behavior and fracture toughness of BMGs is highly limited.…”

Section: Introductionmentioning

confidence: 99%

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Role of pre-existing shear band morphology in controlling the fracture behavior of a Zr–Ti–Cu–Ni–Al bulk metallic glass

Scudino

Gludovatz

et al. 2020

Materials Science and Engineering: A

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Section: Role Of Shear Band Orientationsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Role of pre-existing shear band morphology in controlling the fracture behavior of a Zr–Ti–Cu–Ni–Al bulk metallic glass

Scudino

Gludovatz

et al. 2020

Materials Science and Engineering: A

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“…The starting point of crack corresponds to the time when the strain sudden decrease. The initiation time of crack was determined according to the following formula 37 :…”

Section: Dynamic Three-point Bending Experimentsmentioning

confidence: 99%

“…The starting point of crack corresponds to the time when the strain sudden decrease. The initiation time of crack was determined according to the following formula 37 :

t_{s} goodbreak= t_{r} goodbreak- t_{u} goodbreak- italicΔt,

where

t_{r}

is the starting rise time of the voltage signal of SG4,

t_{r} = \frac{t_{1} + t_{2}}{2}

t_{1}

and

t_{2}

are the moments when SG3 and SG4 receive stress waves,

t_{u}

is the time when the SG3 voltage signal begins to rise, and

italicΔt

is the time span required for the unloading wave to propagate from the center of the pattern notch to SG4, determined by the following formula:

italicΔt goodbreak= \frac{l}{C_{0}} goodbreak+ \frac{\sqrt{r^{2} + {((), W / 2)}^{2}}}{C_{1}},

where l is the length of the incident rod, r is the distance from the strain gauge to the notch, and

C_{1}

is the propagation speed of stress waves in the pattern.…”

Section: Experiments Investigationmentioning

confidence: 99%

Optimization of 3D printed bioinspired helicoidal composites using Gaussian process regression

Li,

Wu,

Jia

et al. 2024

Polymer Composites

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This work focuses on optimization of 3D printed bioinspired helicoidal composites in design space of helicoidal angle and brick aspect ratio under dynamic three‐point bending loading by performing gaussian process regression‐based Bayesian optimization method. Firstly, the impact responses and crack modes of helicoidal structures under dynamic three‐point bending loading were studied through experiments and simulations. Then, the helicoidal composites with better dynamic mechanical properties were obtained by iterations of Bayesian optimization based on gaussian process regression. Finally, the crack propagation modes of the optimized helicoidal structures under dynamic loading were investigated by analyzing the interlayer stress of the structure. The results show that the interlaminar shear stress of the optimized model is large, which is more prone to produce mixed mode I + II cracks. The mixed mode cracks cause crack deflection, which improving the fracture toughness of the structure.Highlights Bioinspired 3D printed helicoidal composites are optimized by machine learning. The helicoidal composites with better dynamic mechanical properties are obtained. The crack propagation modes of the optimized helicoidal structures are investigated. The mixed mode I + II cracks cause crack deflection.

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“…Notched metallic glass have abstracted many interest because the global plasticity of metallic glass specimens could definitely improve, including normal and nano scale sample (Sha et al 2015, Yang et al 2017, Dutta et al 2018, and several methods, such as slipline field theory, finite element analysis (FE) and Neuber's stress analysis, etc, have also been applied to reveal the effects of notch (Qu et al 2014). However there are more attention paid on the effects of notches shape and sharpness, little care on the slope of the notch (Henann and Anand 2009, Sha et al 2015, Chen et al 2016, Gu et al 2017, but with different slope, there may exhibit different deformation and stress-strain state. And also when we want to check different yield criterion, such as Mises and Mohr-Coulomb criterion, the notch without slope may restrict the progress of shear bands, and the model may look like to afford Mises Criterion.…”

Section: Introductionmentioning

confidence: 99%

Normal stress effect on plastic yielding of notched metallic glass: a finite element simulation study

Zhong

Ren

et al. 2020

Mater. Res. Express

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The pressure or normal stress effect on the plastic yielding of metallic glasses (MGs) is still poorly understood due to their complex nature of deformation process. A knowledge on the internal stress distribution and evolution around the plastic shearing plane holds the key for understanding the above issue. In this study, we studied the plastic deformation process of a notched bulk metallic glass by finite element simulation using the von-Mises yielding criterion and Mohr-Coulomb yield criterion, respectively. The internal shear stress distribution and evolution on the notched shear plane was analyzed, and the yielding strength is extracted by averaging the shear stress on the shear plane. It was found that the plastic flow of MGs is greatly influenced by the pressure/normal stress effect as captured by Mohr-Coulomb yielding criterion, and the strength extracted with the criterion agrees well with that obtained from experiments. The effect of pressure/normal stress on the plastic flow of MGs are also discussed from the mechanistic viewpoint. Our results may help for understanding the underlying origin for the pressure/normal stress effect on the plastic flow of MGs.

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Improvement of dynamic notch toughness for the Zr 56 Co 28 Al 16 bulk metallic glass by local pre-deformation

Cited by 7 publications

References 43 publications

Role of pre-existing shear band morphology in controlling the fracture behavior of a Zr–Ti–Cu–Ni–Al bulk metallic glass

Role of pre-existing shear band morphology in controlling the fracture behavior of a Zr–Ti–Cu–Ni–Al bulk metallic glass

Optimization of 3D printed bioinspired helicoidal composites using Gaussian process regression

Normal stress effect on plastic yielding of notched metallic glass: a finite element simulation study

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