Toughness scale from first principles

Ogata, Shigenobu; Li, Ju

doi:10.1063/1.3267158

Cited by 45 publications

(27 citation statements)

References 31 publications

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“…According to the analysis above, ideal strength data (r 0 and s 0 ) of six fcc crystals (Cu, Au, Ni, Pt, Al, and Ir) were collected from literature [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] and are listed in Table I. Since for some metals the reported data are dispersive, here we selected the data of r 0 and s 0 to use in the present study from those obtained, as far as possible, by the same group or with the same method, as identified in bold and underlined in Table I.…”

Section: Computational Detailsmentioning

confidence: 99%

“…21 Several experiments [22][23][24][25][26][27][28] recently claimed that the strengths have approached or even exceeded the ideal strengths calculated by the first principle method. However, raw data of ideal strengths in literature [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] are mostly the ideal cleavage strength (ICS) of low index planes such as f100g, f110g, and f111g and the ideal shear strength (ISS) of f111gh112i and f111gh110i for face-centered-cubic (fcc) crystals. These strength values cannot be simply compared with those measured from the uniaxial loading [22][23][24][25][26][27] or hardness experiments 28 owing to the influence of the competition between fracture along different planes and the obvious normal stress effect for high-strength materials.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropy of tensile strength and fracture mode of perfect face-centered-cubic crystals

Wang

et al. 2015

Journal of Applied Physics

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Section: Computational Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anisotropy of tensile strength and fracture mode of perfect face-centered-cubic crystals

Wang

et al. 2015

Journal of Applied Physics

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“…Theoretically, the shearability and tensibility are characterized by ideal shear strength and ideal tensile strength . As for the fracture toughness, it is studied by the energy density absorbed by shear deformation and tensile deformation in the process of structural instability . In the following, the ideal shear strength, tensile strength and fracture toughness of β‐Si 3 (C x ,N 1− x ) 4 at different carbon concentration were investigated.…”

Section: Resultsmentioning

confidence: 99%

“…As for the shear strain energy density stored in the unit volume, W shear , it can be calculated as,

W_{normalshear} = min_{shear mode} {false\int}_{0}^{η_{ideal}} \frac{Ω}{{normalΩ}_{0}} Tr ()(, boldτ {boldJ}^{- T} d η {boldJ}^{- 1}),

…”

Section: Methodologies and Materialsmentioning

confidence: 99%

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Influence of carbon on stability, mechanical property, electronic structure, and lattice dynamics of silicon carbonitride

Hua

Zhong

et al. 2018

J Am Ceram Soc

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In this study, first‐principles calculations were performed to study the stability, mechanical property, electronic structure and lattice dynamics of β‐Si3(Cx,N1−x)4 silicon carbonitride. The solubility of carbon in β‐Si3(Cx,N1−x)4 having a stable structure is shown to be about 15 at.%. Within the limit of solubility, an increase in carbon concentration in β‐Si3(Cx,N1−x)4 will lead to a decrease in the Young's modulus and density and an increase in the Poisson's ratio. The study of deformation behavior shows that the most likely slip system of 11¯000001 is on prismatic plane rather than on basal plane. This feature of β‐Si3(Cx,N1−x)4 is similar to WC. In addition, the ductility and fracture toughness of β‐Si3(Cx,N1−x)4 can be optimized by controlling the carbon concentration. The improvement in ductility and fracture toughness can be attributed to the formation of metallic bonds by the incorporation of carbon atoms. The lattice dynamics study shows that the structural stability of β‐Si3(Cx,N1−x)4 is controlled by energy stability criteria under stress‐free condition. In the stressed state, the structural stability of β‐Si3(Cx,N1−x)4 is controlled by the elastic stability criteria. Subsequently, the β‐Si3(Cx,N1−x)4 solid solution was prepared by self‐propagating high‐temperature synthesis (SHS), and the carbon‐concentration‐dependent mechanical properties were consistent with the first‐principles calculations. The maximum fracture toughness of 10.4 MPa·m0.5 was obtained in β‐Si3(Cx,N1−x)4 at carbon concentration of 5 wt%, which means that the solid solution toughening can be used as a supplement to crack bridging toughening and phase transition toughening for ceramic toughening. The results obtained in this study reveal that the β‐Si3(Cx,N1−x)4 solid solution is a promising candidate for high‐speed ceramic bearings.

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Additive ram material extrusion and diddling of fully compounded thermoset nitrile rubber

et al. 2021

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A ram extruder is described for high-pressure extrusion of fully compounded thermoset rubber to achieve additive manufacturing. The extruder uses a piston driven by a geared stepper motor to provide volumetric displacement of the rubber charge residing in a temperature-controlled barrel. Along with activators, accelerators, and a vulcanizing agent, the rubber compound is a formulation of 30 parts carbon black per hundred parts nitrile rubber. Sets of serpentine patterns are printed in parallel and transverse orientations relative to the load direction. From printing to post-cure, the printed specimens exhibited linear shrinkage of 65% in the print direction. Although printed samples had relatively low void content compared with typical additively manufactured parts by material extrusion, significant decreases in the tensile properties were observed relative to compression-molded specimens of the same rubber compound. The mean strain to failure was observed as 462% for compression-molded samples, compared with 347% and 183% for printed specimens with parallel and transverse orientations. To reduce the shrinkage and increase the interfacial area between extruded roads, backstitch and sinewave diddling patterns were implemented to superimpose oscillatory motions along the print path with a periodicity of 1 mm. The specimens printed with the diddling patterns were observed to provide less shrinkage and improved properties compared to the regular serpentine patterns. The mean strain to failure in the transverse orientation, respectively, increased to 218% and 265% for the backstitch and sinewave patterns. Suggested future research is discussed, and the diddling program is provided in the appendix. K E Y W O R D S material extrusion, nitrile rubber, diddling patterns, 3D printing, thermoset rubber 1 | INTRODUCTION Additive manufacturing provides a means by which complex products may be made without tooling. ASTM F2792: Standard Terminology for Additive Manufacturing Technologies defines seven families of additive manufacturing. Of

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Toughness scale from first principles

Cited by 45 publications

References 31 publications

Anisotropy of tensile strength and fracture mode of perfect face-centered-cubic crystals

Anisotropy of tensile strength and fracture mode of perfect face-centered-cubic crystals

Influence of carbon on stability, mechanical property, electronic structure, and lattice dynamics of silicon carbonitride

Additive ram material extrusion and diddling of fully compounded thermoset nitrile rubber

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