Modeling brittle fracture due to anisotropic thermal expansion in polycrystalline materials

Rezwan, Aashique A.; Jokisaari, Andrea M.; Tonks, Michael

doi:10.1016/j.commatsci.2021.110407

Cited by 14 publications

(7 citation statements)

References 32 publications

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“…The observed magnitude and anisotropy in this hydriding lattice strain are respectively hundreds and tens times greater than thermal misfit strains of the order 10 -4 that cause cracking in anisotropic materials [32].…”

Section: Structural Evolution In Situmentioning

confidence: 82%

Structural and Phase Evolution in U3si2 During Steam Corrosion

Liu¹,

Burr

White

et al. 2022

SSRN Journal

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Section: Structural Evolution In Situmentioning

confidence: 82%

Structural and Phase Evolution in U3si2 During Steam Corrosion

Liu¹,

Burr

White

et al. 2022

SSRN Journal

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“…At burnups below 0.1 at%, the grain structure of the uranium was easily recognizable regardless of the irradiation temperature, though some grain boundary cracking was observed at high irradiation temperatures. This grain boundary cracking is likely a result of thermal expansion stress at high temperature, hypothesized in [49]. Thermal cycling experiments without irradiation found that polycrystalline samples deformed significantly and developed interior cracks with about 100 K temperature difference, and recent modeling has shown that thermal stresses arising from the negative thermal expansion coefficient is sufficient to cause cracking after a temperature change of about 100 K in irradiated α-U.…”

Section: Irradiation-induced Growth and Swellingmentioning

confidence: 95%

“…Conversely, later studies [51] show clear evidence that certain porosity is due to mechanical cavitation and void formation. Recent modeling work has indicated that mechanical tearing along grain boundaries can arise from thermal stresses and irradiation growth stresses [13,47,49], but the nucleation mechanism of intergranular voids remains unclear. Twin boundaries were implicated in the formation of crystallographically aligned voids [46], though later work hypothesized they are void superlattices.…”

Section: Irradiation-induced Growth and Swellingmentioning

confidence: 99%

A Review of Irradiation Damage and Effects in α-Uranium

2022

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Understanding irradiation damage and effects in α-uranium (α-U) is critical to modeling the behavior of U-based metallic fuels. The aim of this review is to address the renewed interest in U-based metallic fuels by examining the state-of-the-art knowledge associated with the effect of irradiation on the microstructure, dimensional changes, and properties of α-U. We critically review the research progress on irradiation-induced growth and swelling, the enhancement of plastic flow and superplasticity by irradiation, and the effect of irradiation on thermal and electrical properties of α-U. Finally, we outline the research directions that require advancements, specifically the need to carry out fundamental research on several of the less understood mechanisms of irradiation damage and effects in α-U.

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“…However, with the temperature of the material rising to a higher temperature, its elastic modulus value sharply decreases. Therefore, this has great influence on the establishment of an accurate high-temperature Lemaitre damage model for Cr5 alloy steel [ 40 ]. Previous studies on the Lemaitre damage model have rarely involved attention to the change of material elastic modulus, the research results obtained are often quite different from the actual results and are of low accuracy in terms of material damage prediction.…”

Section: Establishment Of High-temperature Damage Model Of Cr5 Alloy ...mentioning

confidence: 99%

An Enhanced Lemaitre Model and Fracture Map for Cr5 Alloy Steel during High-Temperature Forming Process

et al. 2022

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To effectively control and predict crack defects in the high-temperature forming process of Cr5 alloy steel, based on the traditional Lemaitre damage model, a new high-temperature damage model of Cr5 alloy steel was proposed which considered the change of material elastic modulus with temperature, the influence of material hydrostatic pressure as well as temperature and strain rate on material damage. Because Cr5 alloy steels are usually forged at high temperatures, tensile testing is an important method to study the damage behaviour of materials. Through the high-temperature tensile test and elastic modulus measurement test of the Cr5 alloy steel, the stress–strain curves and the relationship curves of the elastic modulus value with the temperature of Cr5 alloy steel under different temperatures and strain rates were obtained. A new high-temperature damage model of Cr5 alloy steel was built by introducing the Zener–Hollomon coefficient considering the influence of temperature and strain rate. The established high-temperature damage model was embedded in Forge® finite element software through the program’s secondary development method to numerically simulate the experimental process of Cr5 alloy steel. Comparing the difference between the displacement–load curves of the numerical simulation and the actual test of the tensile process of the experimental samples, the correlation coefficient R2 is 0.987 and the difference between the experimental value and the simulated value of the tensile sample elongation at break is 1.28%. The accuracy of the high-temperature damage model of Cr5 alloy steel established in this paper was verified. Finally, the high-temperature damage map of Cr5 alloy steel was constructed to analyse the variation law of various damage parameters with the temperature and strain rate of the high-temperature damage model of Cr5 alloy steel.

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Modeling brittle fracture due to anisotropic thermal expansion in polycrystalline materials

Cited by 14 publications

References 32 publications

Structural and Phase Evolution in U3si2 During Steam Corrosion

Structural and Phase Evolution in U3si2 During Steam Corrosion

A Review of Irradiation Damage and Effects in α-Uranium

An Enhanced Lemaitre Model and Fracture Map for Cr5 Alloy Steel during High-Temperature Forming Process

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