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- 저자 : Jingyu Pang (검색결과 3 건)
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Jingyu Zhang,Jiacheng Zhu,Shurong Ding,Liang Chen,Wenjie Li,Hua Pang 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.7
Delayed hydride cracking (DHC) is an important failure mechanism for Zircaloy tubes in the demandingenvironment of nuclear reactors. The threshold stress intensity factor, KIH, and critical hydride length, lC ,are important parameters to evaluate DHC. Theoretical models of them are developed for Zircaloy tubesundergoing non-homogenous temperature loading, with new stress distributions ahead of the crack tipand thermal stresses involved. A new stress distribution in the plastic zone ahead of the crack tip isproposed according to the fracture mechanics theory of second-order estimate of plastic zone size. Thedeveloped models with fewer fitting parameters are validated with the experimental results for KIH andlC. The research results for radial cracking cases indicate that a better agreement for KIH can be achieved;the negative axial thermal stresses can lessen KIH and enlarge the critical hydride length, so its effectshould be considered in the safety evaluation and constraint design for fuel rods; the critical hydridelength lC changes slightly in a certain range of stress intensity factors, which interprets the phenomenonthat the DHC velocity varies slowly in the steady crack growth stage. Besides, the sensitivity analysis ofmodel parameters demonstrates that an increase in yield strength of zircaloy will result in a decrease inthe critical hydride length lC , and KIH will firstly decrease and then have a trend to increase with the yieldstrength of Zircaloy; higher fracture strength of hydrided zircaloy will lead to very high values ofthreshold stress intensity factor and critical hydride length at higher temperatures, which might be themain mechanism of crack arrest for some Zircaloy materials
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Zhongjia Xia,Bingzhong Wang,Jingyu Zhang,Shurong Ding,Liang Chen,Hua Pang,Xiaoming Song 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.1
In the high-temperature and high-pressure irradiation environments, the multi-field coupling processes ofhydrogen diffusion, hydride precipitation and mechanical deformation in Zircaloy cladding tubes occur. Tosimulate this hydrogen-induced complex behavior, a multi-field coupling method is developed, with theirradiation hardening effects and hydride-precipitation-induced expansion and hardening effects involvedin the mechanical constitutive relation. The out-pile tests for a cracked cladding tube after irradiation aresimulated, and the numerical results of the multi-fields at different temperatures are obtained andanalyzed. The results indicate that: (1) the hydrostatic stress gradient is the fundamental factor to activatethe hydrogen-induced multi-field coupling behavior excluding the temperature gradient; (2) in the localcrack-tip region, hydrides will precipitate faster at the considered higher temperatures, which can befundamentally attributed to the sensitivity of TSSP and hydrogen diffusion coefficient to temperature. Themechanism is partly explained for the enlarged velocity values of delayed hydride cracking (DHC) at hightemperatures before crack arrest. This work lays a foundation for the future research on DHC.
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Jun Xiong,Jing Luo,Lei Yang,Jingyu Pang,Wenshuai Zhu,Huaming Li 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
Boron defect engineered boron nitride (BN) nanosheets have been prepared with the barbituric acid as co-reactant sources. By virtue of B defects, the electronic structure of BN undergo significantly variation, in which the conduction band of BN declined from −1.35 to −0.54 eV and decreased chemical acid hardness. After B defect engineering, BN nanosheets display greatly improved adsorptive desulfurization performance towards dibenzothiophene (DBT), with optimized adsorption capacity of 43.6 mgS g−1 for model oil. The increased adsorptive desulfurization performance was derived from decreased chemical acid hardness by B defect engineering, thus can build preferable interplay between the soft base DBT.
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