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RISS 인기검색어
- 검색키워드
- 저자 : Xiaobin Jian (검색결과 8 건)
- 무료
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Jian, Xiaobin,Ding, Shurong Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.4
Three-dimensional finite element simulations are implemented for the in-pile thermo-mechanical behavior in U-Mo/Al monolithic fuel plates with different thermal creep rates of cladding involved. The numerical results indicate that the thickness increment of fuel foil rises with the thermal creep coefficient of cladding. The maximum Mises stress of cladding is reduced by ~85% from 344 MPa on the 98.0<sup>th</sup> day when the creep coefficient of cladding increases from 0.01 to 10.0, due to its equivalent thermal creep strain enlarged by 3.5 times. When the thermal creep coefficient of Aluminum cladding increases from 0 to 1.0, the maximum mesoscale stress of fuel foil varies slightly. At the same time, the peak mesoscale normal stress of fuel foil can reach 51 MPa on the 98.0<sup>th</sup> day for the thermal creep coefficient of 10, which increases by 60.3% of that with the thermal creep un-occurred in the cladding. The maximum through-thickness creep strain components of fuel foil differ slightly for different thermal creep coefficients of cladding. The dangerous region of fuel foil becomes much closer to the heavily irradiated side when the creep coefficient of cladding becomes 10.0. The creep performance of Aluminum cladding should be optimized for the integrity of monolithic fuel plates.
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Xiaobin Jian,Xiangzhe Kong,Shurong Ding 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.6
Fracture near the Ue10Mo/cladding material interface impacts fuel service life. In this work, a mesoscalestress model is developed with the fuel foil considered as a porous medium having gas bubbles andbearing bubble pressure and surface tension. The models for the evolution of bubble volume fraction,size and internal pressure are also obtained. For a Ue10Mo/Al monolithic fuel plate under locationdependentirradiation, the finite element simulation of the thermo-mechanical coupling behavior isimplemented to obtain the bubble distribution and evolution behavior together with their effects on themesoscale stresses. The numerical simulation results indicate that higher macroscale tensile stressesappear close to the locations with the maximum increments of fuel foil thickness, which is intensivelyrelated to irradiation creep deformations. The maximum mesoscale tensile stress is more than 2 times ofthe macroscale one on the irradiation time of 98 days, which results from the contributions of considerablevolume fraction and internal pressure of bubbles. This study lays a foundation for the fracturemechanism analysis and development of a fracture criterion for Ue10Mo monolithic fuels.
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Jianning Li,Zhujian Li,Yufei Xu,Kaiyang Gu,Wendong Bao,Xiaobin Xu 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.5
This paper investigates the non-fragile state estimation problem for discrete nonlinear Markov jump neural networks(MJNNs) with sensor failures. Due to the limit communication resource, we adopt a kind of eventtriggered mechanism to determine whether the sensor sampling information is sent or not. By selecting suitable Lyapunov functions, a sufficient condition is obtained to guarantee the mean-square exponential stability of the augmented system. Finally, a numerical example is given to show the effectiveness of the proposed method.
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Quasipolar matrix rings over local rings
Jian Cui,Xiaobin Yin 대한수학회 2014 대한수학회보 Vol.51 No.3
A ring R is called quasipolar if for every a 2 R there exists p2 = p ∈ R such that p ∈ comm2 R(a), a + p ∈ U(R) and ap 2∈Rqnil. The class of quasipolar rings lies properly between the class of strongly π-regular rings and the class of strongly clean rings. In this paper, we determine when a 2 × 2 matrix over a local ring is quasipolar. Necessary and sufficient conditions for a 2 × 2 matrix ring to be quasipolar are obtained.
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Jian Cui,Xiaobin Yin 대한수학회 2018 대한수학회보 Vol.55 No.5
A $*$-ring $R$ is called $*$-regular if every principal one-sided ideal of $R$ is generated by a projection. In this note, several characterizations of $*$-regular rings are provided. In particular, it is shown that a matrix ring $M_n(R)$ is $*$-regular if and only if $R$ is regular and $1+x_1^*x_1+\cdots+x_{n-1}^*x_{n-1}$ is a unit for all $x_i$ of $R;$ which answers a question raised in the literature recently.
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Cui, Jian,Yin, Xiaobin Korean Mathematical Society 2018 대한수학회보 Vol.55 No.5
A ${\ast}-ring$ R is called ${\ast}-regular$ if every principal one-sided ideal of R is generated by a projection. In this note, several characterizations of ${\ast}-regular$ rings are provided. In particular, it is shown that a matrix ring $M_n(R)$ is ${\ast}-regular$ if and only if R is regular and $1+x^*_1x_1+{\cdots}+x^*_{n-1}x_{n-1}$ is a unit for all $x_i$ of R; which answers a question raised in the literature recently.
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QUASIPOLAR MATRIX RINGS OVER LOCAL RINGS
Cui, Jian,Yin, Xiaobin Korean Mathematical Society 2014 대한수학회보 Vol.51 No.3
A ring R is called quasipolar if for every a 2 R there exists $p^2=p{\in}R$ such that $p{\in}comm^2{_R}(a)$, $ a+p{\in}U(R)$ and $ap{\in}R^{qnil}$. The class of quasipolar rings lies properly between the class of strongly ${\pi}$-regular rings and the class of strongly clean rings. In this paper, we determine when a $2{\times}2$ matrix over a local ring is quasipolar. Necessary and sufficient conditions for a $2{\times}2$ matrix ring to be quasipolar are obtained.
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Thermo-mechanical coupling behavior analysis for a U-10Mo/Al monolithic fuel assembly
Mao, Xiaoxiao,Jian, Xiaobin,Wang, Haoyu,Zhang, Jingyu,Zhang, Jibin,Yan, Feng,Wei, Hongyang,Ding, Shurong,Li, Yuanming Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.9
A typical three-dimensional finite element model for a fuel assembly is established, which is composed of 16 monolithic U-10Mo fuel plates and Al alloy frame. The distribution and evolution results of temperature, displacement and stresses/strains in all the parts are numerically obtained and analyzed with a self-developed code of FUELTM. The simulation results indicate that (1) the out-of-plane displacements of Al alloy side plates are mainly attributed to the bending deformations; (2) enhanced out-of-plane displacements appear in fuel plates adjacent to the outside Al plates, which results from the occurred bending deformations due to the applied constraints of outside Al plates; (3) an intense interaction of fuel foil with the cladding occurs near the foil edge, which appears more heavily in the fuel plates adjacent to the outside Al plates. The maximum first principal stresses in the fuel foil are similar for all the fuel plates and appear near the fuel foil edge; while, the through-thickness creep strains of fuel foil in the fuel plate near the central region of fuel assembly are larger, and the induced creep damage might weaken the fuel skeleton strength and raise the fuel failure risk.
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