Measurements of Young’s and shear moduli of rail steel at elevated temperatures

Bao, Yuanye; Zhang, Haifeng; Ahmadi, Mehdi; Karim, Afzalul; Wu, Hui

doi:10.1016/j.ultras.2013.10.015

Cited by 16 publications

(12 citation statements)

References 15 publications

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“…The diameter of the AlSiNTs is indicated by the number of unit cells in the circumference, denoted by N. AlSiNTs with 11 unit cells in the circumference were denoted as AlSiNT11 and the remainder can be deduced by analogy. 53,54 In addition, the Young's modulus of AlSiNTs in this work was consistent with the results from previous reports (in a range of 122-479 GPa), [47][48][49] which was determined by density-functional based tight-binding (DFTB), density functional theory (DFT), or the self-consistent charge density-functional based tight-binding (SCC-DFTB) methods. The CNTs discussed in this study are single-walled carbon nanotubes with a chirality of (14,14), denoted as SWCNT (14,14).…”

Section: Resultssupporting

confidence: 91%

“…In all cases, the Young's modulus of AlSiNTs was approximately 340 GPa, which is higher than that of most engineering materials, such as structural or rail steel (∼200 GPa). 53,54 In addition, the Young's modulus of AlSiNTs in this work was consistent with the results from previous reports (in a range of 122-479 GPa), [47][48][49] which was determined by density-functional based tight-binding (DFTB), density functional theory (DFT), or the self-consistent charge density-functional based tight-binding (SCC-DFTB) methods. Nevertheless, the estimations of Young's modulus using the presented nanoscale continuum modelling require much less computational resources than the methods mentioned above.…”

Section: Resultssupporting

confidence: 91%

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Relationships among the structural topology, bond strength, and mechanical properties of single-walled aluminosilicate nanotubes

2015

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Carbon nanotubes (CNTs) are regarded as small but strong due to their nanoscale microstructure and high mechanical strength (Young's modulus exceeds 1000 GPa). A longstanding question has been whether there exist other nanotube materials with mechanical properties as good as those of CNTs. In this study, we investigated the mechanical properties of single-walled aluminosilicate nanotubes (AlSiNTs) using a multiscale computational method and then conducted a comparison with single-walled carbon nanotubes (SWCNTs). By comparing the potential energy estimated from molecular and macroscopic material mechanics, we were able to model the chemical bonds as beam elements for the nanoscale continuum modeling. This method allowed for simulated mechanical tests (tensile, bending, and torsion) with minimum computational resources for deducing their Young's modulus and shear modulus. The proposed approach also enabled the creation of hypothetical nanotubes to elucidate the relative contributions of bond strength and nanotube structural topology to overall nanotube mechanical strength. Our results indicated that it is the structural topology rather than bond strength that dominates the mechanical properties of the nanotubes. Finally, we investigated the relationship between the structural topology and the mechanical properties by analyzing the von Mises stress distribution in the nanotubes. The proposed methodology proved effective in rationalizing differences in the mechanical properties of AlSiNTs and SWCNTs. Furthermore, this approach could be applied to the exploration of new high-strength nanotube materials.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 91%

Relationships among the structural topology, bond strength, and mechanical properties of single-walled aluminosilicate nanotubes

2015

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“…The measurands along with propagated uncertainties with units and symbols during the measurement are shown in Table 7. To have a confidence interval of 95%, the coverage factor for uncertainty is 2 [30,31]. The overall uncertainty equation used in [30]…”

Section: Experimental Uncertainty Analysismentioning

confidence: 99%

Measurements of the second-order elastic constants of powder-bed fusion 17-4 PH AM steel using ultrasound (Withdrawal Notice)

Zhang

2023

Active and Passive Smart Structures and Integrated Systems XVII

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Additive manufacturing (AM) of metals has drawn attention by both researchers and industries in recent decades for replacing aspects of conventional steel fabrication due to lessened cost and higher production flexibility. However, the characterization of the properties of AM steel remains scarce. This paper presents the ultrasonic determination of the second-order elastic constants of 17-4 PH steel produced using powder bed fusion AM. Both longitudinal and shear wave phase velocities are used to solve for the elastic constants. The present values of second-order elastic constants are compared with traditionally manufactured 17-4 PH. Porosity effects on second-order elastic constants of additive-manufactured 17-4 PH steel are also analyzed.

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“…Foi designada como deslocamento negativo a leitura que se aproximaram no sentido do centro da amostra e deslocamento positivo sentido inverso. Como descrito nos trabalhos de Chanbi et al [11] e Bao et al [12], foram realizados vários testes objetivando verificar os resultados de E (GPa), G (GPa) e Poisson, alinhando a localização dos picos com as razões entre picos esperado/real objetivando menor erro e menor desvio padrão entre cada leitura. Também, as amostras foram giradas em várias direções no plano, isso foi feito para verificar se os espectros de resposta à vibração eram os mesmos e assim verificar a homogeneidade/isotropia das amostras no MB e na região da ZF.…”

Section: Figura 3 Esquema De Marcação Na Quantificação Das Constanteunclassified

Uso da Técnica de Ressonância de Barras no Monitoramento das Propriedades Mecânicas da Zona Fundida do Aço ASTM A36

et al. 2020

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Resumo: Neste estudo, faz-se uso do método dinâmico e a técnica de ressonância de barras para medir as constantes elásticas da ZF da junta soldada de um aço estrutural ASTM Grau A36. A geometria, massa e frequência de ressonância (na flexão e na torção), de amostras com seção transversal retangular, são usadas para determinar as características elásticas e homogeneidade da junta soldada e do metal base pela norma ASTM E1875-13. As demais propriedades da junta soldada são determinadas pelos ensaios convencionais de tração, impacto (Charpy V), dureza e por microscopia ótica, difração de raios-X e EDS acoplada ao MEV. Os resultados dos ensaios convencionais quantificaram valores dentro dos padrões estabelecidos por norma, demonstraram a formação de fase típica sem a formação de novas fases e a dureza média foi 10% maior na ZF, o comportamento de fratura se mostrou dúctil. O refino de grão na região revelou uma maior quantidade de perlita e maior teor de elementos de liga, as constantes elásticas foram alteradas em relação ao MB de 4,9% a mais para o módulo de Young, 7,65% maior para o cisalhamento e 11,7% menor para a razão de Poisson, mostrando assim que o método é viável tanto para prever no MB e na ZF os valores das constantes elásticas.

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Measurements of Young’s and shear moduli of rail steel at elevated temperatures

Cited by 16 publications

References 15 publications

Relationships among the structural topology, bond strength, and mechanical properties of single-walled aluminosilicate nanotubes

Relationships among the structural topology, bond strength, and mechanical properties of single-walled aluminosilicate nanotubes

Measurements of the second-order elastic constants of powder-bed fusion 17-4 PH AM steel using ultrasound (Withdrawal Notice)

Uso da Técnica de Ressonância de Barras no Monitoramento das Propriedades Mecânicas da Zona Fundida do Aço ASTM A36

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