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Investigation of the size-dependent crushing behavior of Li4SiO4 pebbles via discrete element method.

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Title: Investigation of the size-dependent crushing behavior of Li4SiO4 pebbles via discrete element method.
Authors: Kuang, Du-min1 (AUTHOR) kuangdumin@xtu.edu.cn, Su, Jia1 (AUTHOR), Chen, Zhao-Rong2 (AUTHOR), Ogwu, Ikechukwu3 (AUTHOR)
Source: Fusion Engineering & Design. Feb2024, Vol. 199, pN.PAG-N.PAG. 1p.
Subjects: Discrete element method, Pebbles, Fractal dimensions, Distribution (Probability theory)
Abstract: • The probabilistic crushing strength of Li4SiO4 pebbles were reproduced in DEM simulations by the random sub-ball removal scheme. • The size-dependent crushing strength and fragment size distribution were quantitatively analyzed. • The frequency distribution of failure pattern for Li4SiO4 pebbles with different sizes were presented. Li 4 SiO 4 pebbles are commonly employed as breeder materials in solid breeder blankets. As a typical brittle material, the Li 4 SiO 4 pebble sizes significantly affect their crushing behavior. In this study, the size-dependent crushing behavior of pebbles is investigated via discrete element method. Based on the Weibull theory, the probabilistic crushing strength of Li 4 SiO 4 pebbles is analyzed. The numerical results demonstrate that both the characteristic crushing strength and Weibull modulus display a negative linear relationship with Li 4 SiO 4 pebble size in a double-logarithmic plot. Furthermore, by considering both the axial force-displacement responses and fracture process of pebbles, three typical failure patterns of Li 4 SiO 4 pebbles can be identified, namely, splitting failure (Pattern-I), progressive fracturing failure (Pattern-II) and explosive failure (Pattern-III). As the pebble size decreases, the failure pattern gradually shifts from Pattern-I to Pattern-II and to Pattern-III. Additionally, the fragment size distributions of crushed Li 4 SiO 4 pebbles are analyzed based on the fractal theory. It is observed that the fragment size distributions of Li 4 SiO 4 pebbles with varying sizes exhibit favorable fractal features. Smaller Li 4 SiO 4 pebbles exhibit a more significant fragmentation, as evidenced by the increasing fractal dimension of the fragment size distribution with the decreasing pebble size. This work may provide valuable support for further investigations into the mechanical performance of a Li 4 SiO 4 breeder blanket using DEM simulations. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• The probabilistic crushing strength of Li4SiO4 pebbles were reproduced in DEM simulations by the random sub-ball removal scheme. • The size-dependent crushing strength and fragment size distribution were quantitatively analyzed. • The frequency distribution of failure pattern for Li4SiO4 pebbles with different sizes were presented. Li 4 SiO 4 pebbles are commonly employed as breeder materials in solid breeder blankets. As a typical brittle material, the Li 4 SiO 4 pebble sizes significantly affect their crushing behavior. In this study, the size-dependent crushing behavior of pebbles is investigated via discrete element method. Based on the Weibull theory, the probabilistic crushing strength of Li 4 SiO 4 pebbles is analyzed. The numerical results demonstrate that both the characteristic crushing strength and Weibull modulus display a negative linear relationship with Li 4 SiO 4 pebble size in a double-logarithmic plot. Furthermore, by considering both the axial force-displacement responses and fracture process of pebbles, three typical failure patterns of Li 4 SiO 4 pebbles can be identified, namely, splitting failure (Pattern-I), progressive fracturing failure (Pattern-II) and explosive failure (Pattern-III). As the pebble size decreases, the failure pattern gradually shifts from Pattern-I to Pattern-II and to Pattern-III. Additionally, the fragment size distributions of crushed Li 4 SiO 4 pebbles are analyzed based on the fractal theory. It is observed that the fragment size distributions of Li 4 SiO 4 pebbles with varying sizes exhibit favorable fractal features. Smaller Li 4 SiO 4 pebbles exhibit a more significant fragmentation, as evidenced by the increasing fractal dimension of the fragment size distribution with the decreasing pebble size. This work may provide valuable support for further investigations into the mechanical performance of a Li 4 SiO 4 breeder blanket using DEM simulations. [ABSTRACT FROM AUTHOR]
ISSN:09203796
DOI:10.1016/j.fusengdes.2023.114105