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INTERFACIAL CRACK ANALYSIS IN THREE-DIMENSIONAL TRANSVERSELY ISOTROPIC BI-MATERIALS BY BOUNDARY INTEGRAL EQUATION METHOD
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作者 赵明皞 李冬霞 沈亚鹏 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2005年第12期1539-1546,共8页
The integral-differential equations for three-dimensional planar interfacial cracks of arbitrary shape in transversely isotropic bimaterials were derived by virtue of the Somigliana identity and the fundamental soluti... The integral-differential equations for three-dimensional planar interfacial cracks of arbitrary shape in transversely isotropic bimaterials were derived by virtue of the Somigliana identity and the fundamental solutions, in which the displacement discontinuities across the crack faces are the unknowns to be determined. The interface is parallel to both the planes of isotropy. The singular behaviors of displacement and stress near the crack border were analyzed and the stress singularity indexes were obtained by integral equation method. The stress intensity factors were expressed in terms of the displacement discontinuities. In the non-oscillatory case, the hyper-singular boundary integral-differential equations were reduced to hyper-singular boundary integral equations similar to those of homogeneously isotropic materials. 展开更多
关键词 three-dimensional bi-material transversely isotropic interfacial crack stress intensity factor integral-differential equation
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Three-Dimensional Thermal-Stress Analysis of Semi-infinite Transversely Isotropic Composites
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作者 TOKOVYY Yuriy BOIKO Dmytro GAO Cunfa 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2021年第1期18-28,共11页
By making use of the direct integration method,an exact analysis of the general three-dimensional thermoelasticity problem is performed for the case of a transversely isotropic homogeneous half-space subject to local ... By making use of the direct integration method,an exact analysis of the general three-dimensional thermoelasticity problem is performed for the case of a transversely isotropic homogeneous half-space subject to local thermal and force loadings.The material plane of isotropy is assumed to be parallel to the limiting surface of the halfspace.By reducing the original thermoelasticity equations to the governing ones for individual stress-tensor components,the effect of material anisotropy in the stress field is analyzed with regard to the feasibility requirement,i.e.,the finiteness of the stress field at a distance from the disturbed area.As a result,the solution is constructed in the form of explicit analytical dependencies on the force and thermal loadings for various kinds of transversely isotropic materials and agrees with the basic principles of the continua mechanics.The solution can be efficiently used as a benchmark one for the direct computation of temperature and thermal stresses in transversely isotropic semi-infinite domains,as well as for the verification of solutions constructed by different means. 展开更多
关键词 three-dimensional problem analytical solution transversely isotropic composites semi-infinite model force and thermal loadings finite stress distributions
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TORSIONAL OSCILLATION OF RIGID DISK IN INFINITE TRANSVERSELY ISOTROPIC ELASTIC CYLINDER 被引量:1
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作者 Sakti Pada Barik Mridula Kanoria P.K.Chaudhuri 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2006年第7期911-917,共7页
In the present analysis torsional oscillation of a rigid disk in an infinite transversely isotropic elastic cylinder is considered. The effects of anisotropy in the stress intensity factor are shown graphically.
关键词 torsional oscillation transversely isotropic material dual integral equation Fredholm integral equation contour integration
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Implementation of a particle-in-cell method for the energy solver in 3D spherical geodynamic modeling
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作者 Hao Dong ZeBin Cao +4 位作者 LiJun Liu YanChong Li SanZhong Li LiMing Dai XinYu Li 《Earth and Planetary Physics》 EI CAS CSCD 2024年第3期549-563,共15页
The thermal evolution of the Earth’s interior and its dynamic effects are the focus of Earth sciences.However,the commonly adopted grid-based temperature solver is usually prone to numerical oscillations,especially i... The thermal evolution of the Earth’s interior and its dynamic effects are the focus of Earth sciences.However,the commonly adopted grid-based temperature solver is usually prone to numerical oscillations,especially in the presence of sharp thermal gradients,such as when modeling subducting slabs and rising plumes.This phenomenon prohibits the correct representation of thermal evolution and may cause incorrect implications of geodynamic processes.After examining several approaches for removing these numerical oscillations,we show that the Lagrangian method provides an ideal way to solve this problem.In this study,we propose a particle-in-cell method as a strategy for improving the solution to the energy equation and demonstrate its effectiveness in both one-dimensional and three-dimensional thermal problems,as well as in a global spherical simulation with data assimilation.We have implemented this method in the open-source finite-element code CitcomS,which features a spherical coordinate system,distributed memory parallel computing,and data assimilation algorithms. 展开更多
关键词 numerical oscillation overshooting and undershooting particle-in-cell method three-dimensional spherical geodynamic modeling energy solver finite element method
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Exact solution to two-dimensional isotropic charged harmonic oscillator in uniform magnetic field in non-commutative phase space 被引量:3
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作者 卫高峰 龙超云 +1 位作者 隆正文 秦水介 《Chinese Physics C》 SCIE CAS CSCD 北大核心 2008年第4期247-250,共4页
In this paper, the isotropic charged harmonic oscillator in uniform magnetic field is researched in the non-commutative phase space; the corresponding exact energy is obtained, and the analytic eigenfunction is presen... In this paper, the isotropic charged harmonic oscillator in uniform magnetic field is researched in the non-commutative phase space; the corresponding exact energy is obtained, and the analytic eigenfunction is presented in terms of the confluent hypergeometric function. It is shown that in the non-commutative space, the isotropic charged harmonic oscillator in uniform magnetic field has the similar behaviors to the Landau problem. 展开更多
关键词 non-commutative quantum mechanics isotropic charged harmonic oscillator exact solution
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Four kinds of raising and lowering operators of n-dimensional hydrogen atom and isotropic harmonic oscillator 被引量:1
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作者 刘宇峰 曾谨言 《Science China Mathematics》 SCIE 1997年第10期1110-1115,共6页
The factorization of the radial Schrodinger equation of n-dimensional (n≥2) hydrogen atoms and isotropic harmonic oscillators was investigated and four kinds of raising and lowering operators were derived.The relatio... The factorization of the radial Schrodinger equation of n-dimensional (n≥2) hydrogen atoms and isotropic harmonic oscillators was investigated and four kinds of raising and lowering operators were derived.The relation between n -dimensional (n≥2) and one-dimensional hydrogen atoms and harmonic oscillators was discussed. 展开更多
关键词 n-dimensional hydrogen atom and isotropic harmonic oscillator factorization FOUR kinds of raising and lowering operators.
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Fluid flow and fluid shear stress in canaliculi induced by external mechanical loading and blood pressure oscillation 被引量:1
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作者 Shulun LIU Fan WANG Renhuai LIU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2015年第5期681-692,共12页
The paper studies the problem of fluid flow and fluid shear stress in canaliculi when the osteon is subject to external mechanical loading and blood pressure oscillation.The single osteon is modeled as a saturated por... The paper studies the problem of fluid flow and fluid shear stress in canaliculi when the osteon is subject to external mechanical loading and blood pressure oscillation.The single osteon is modeled as a saturated poroelastic cylinder. Solid skeleton is regarded as a poroelastic transversely isotropic material. To get near-realistic results, both the interstitial fluid and the solid matrix are regarded as compressible. Blood pressure oscillation in the Haverian canal is considered. Using the poroelasticity theory, an analytical solution of the pore fluid pressure is obtained. Assuming the fluid in canaliculi is incompressible, analytical solutions of fluid flow velocity and fluid shear stress with the Navier-Stokes equations of incompressible fluid are obtained. The effect of various parameters on the fluid flow velocity and fluid shear stress is studied. 展开更多
关键词 incompressible oscillation cylinder Stokes isotropic interstitial Navier canal realistic saturated
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Dynamical Symmetries of Two-Dimensional Dirac Equation with Screened Coulomb and Isotropic Harmonic Oscillator Potentials
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作者 王青 侯玉龙 +1 位作者 隆正文 荆坚 《Communications in Theoretical Physics》 SCIE CAS CSCD 2014年第11期663-666,共4页
In this paper, we study symmetrical properties of two-dimensional(2D) screened Dirac Hydrogen atom and isotropic harmonic oscillator with scalar and vector potentials of equal magnitude(SVPEM). We find that it is poss... In this paper, we study symmetrical properties of two-dimensional(2D) screened Dirac Hydrogen atom and isotropic harmonic oscillator with scalar and vector potentials of equal magnitude(SVPEM). We find that it is possible for both cases to preserve so(3) and su(2) dynamical symmetries provided certain conditions are satisfied. Interestingly,the conditions for preserving these dynamical symmetries are exactly the same as non-relativistic screened Hydrogen atom and screened isotropic oscillator preserving their dynamical symmetries. Some intuitive explanations are proposed. 展开更多
关键词 dynamical symmetry DIRAC oscillator isotropic Hydrogen oscillator
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Statistical Characteristics of Partial Discharge Caused by Typical Defects in Cable Joint under Oscillating Voltage
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作者 Guangmao Li Zuwei Luo +2 位作者 Jun Xiong Zucheng Huang Yajun Wang 《Journal of Energy and Power Engineering》 2015年第3期310-316,共7页
The oscillating voltage test is a nondestructive detection method for partial discharge of XLPE (cross linked polyethylene) cable and has been applied recently. This paper made three kinds of varying severity artifi... The oscillating voltage test is a nondestructive detection method for partial discharge of XLPE (cross linked polyethylene) cable and has been applied recently. This paper made three kinds of varying severity artificial defect models of cable joints in 10 kV XLPE cable. Oscillating voltage is applied to the model, by use of pulse current method to detect partial discharge signals. In order to study the statistical characteristics of partial discharge of cable joint under the oscillating voltage, three-dimensional statistical map has been made. The results show that for the same kind of defects, with the increases of the defect severity, the discharge interval extended, the magnitude and the number of partial discharge increase, for different kinds of defects, obvious differences exist among the maps, this may established a foundation for the further study of the partial discharge pattern recognition of XLPE cable under oscillating voltage. 展开更多
关键词 XLPE cable cable joint defect model partial discharge oscillating voltage three-dimensional statistical map.
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均质弹性地基中单桩的扭转振动特性研究 被引量:5
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作者 王国才 王哲 +1 位作者 陈龙珠 黄晋 《岩土力学》 EI CAS CSCD 北大核心 2008年第11期3027-3031,3036,共6页
利用积分方程的方法研究了均质弹性地基中单桩的扭转振动问题。在分析过程中,首先利用积分变换的方法得出均质弹性地基内作用一埋置扭矩时的基本解。基于基本解,根据变形协调条件建立了控制单桩扭转振动特性的第2类Fredholm积分方程。... 利用积分方程的方法研究了均质弹性地基中单桩的扭转振动问题。在分析过程中,首先利用积分变换的方法得出均质弹性地基内作用一埋置扭矩时的基本解。基于基本解,根据变形协调条件建立了控制单桩扭转振动特性的第2类Fredholm积分方程。对所得积分方程进行数值求解得到单桩扭转振动时的扭矩和扭转角及动力柔度系数,并对其进行了参数分析。所得结论对桩基础设计与计算以及桩基低应变扭转波动测技术有一定的指导意义。 展开更多
关键词 均质地基 单桩 积分方程 扭转振动
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N维各向同性谐振子径向矩阵元的通项表达式 被引量:3
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作者 郑仰东 侯春风 李淳飞 《光子学报》 EI CAS CSCD 2000年第6期574-576,共3页
推导出了N维(N≥2)各向同性谐振子径向矩阵元的通项表达式,所得结果包含了以前人们给出的N=2、3时的结果.
关键词 壳模型 各向同性谐振子 径向矩阵元 量子力学
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二维各向同性变频率谐振子的超对称性及其不变量的超对称量子力学精确解 被引量:3
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作者 卫高峰 龙超云 +2 位作者 刘旭阳 贺志 段晓勇 《原子与分子物理学报》 CAS CSCD 北大核心 2007年第3期596-600,共5页
采用超对称量子力学与不变量相结合的方法讨论了二维各向同性变频率谐振子,给出了二维各向同性变频率谐振子的不变量,采用超对称量子力学方法精确求解了不变量的本征值和本征函数,并且给出了当频率恒定时,二维常频率谐振子的本征值和本... 采用超对称量子力学与不变量相结合的方法讨论了二维各向同性变频率谐振子,给出了二维各向同性变频率谐振子的不变量,采用超对称量子力学方法精确求解了不变量的本征值和本征函数,并且给出了当频率恒定时,二维常频率谐振子的本征值和本征函数的精确解.最后对不变量的超对称性进行了讨论. 展开更多
关键词 二维变频率谐振子 不变量 本征值 本征函数 超对称性
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N维各向同性谐振子径向平均值的递推关系和解析表达式(英文) 被引量:1
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作者 陈昌远 王忠纯 +1 位作者 刘成林 孙东升 《光子学报》 EI CAS CSCD 北大核心 2002年第6期650-653,共4页
推导出了用于 N维各向同性谐振子径向平均值计算的二个递推关系 ,并在 - 3≤ s≤ 3的条件下 ,给出了平均值〈nr JN - 2 | r2 s| nr JN - 2 〉的值 .
关键词 N维各向同性谐振子 径向平均值 递推关系 解析表达式 量子力学
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三维各向同性谐振子的升降算符 被引量:1
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作者 刘冰 张立红 《西安石油大学学报(自然科学版)》 CAS 2005年第2期86-88,共3页
利用特殊函数关系式以及算符r,1r,ddr对径向函数的作用结果, 得出三维各向同性谐振子的径向算符,便于求解力学量的平均值.重新定义其升降算符,便于求解矩阵元.
关键词 三维各向同性 函数关系式 升降算符 径向算符 径向波函数 量子力学
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类氢原子和同调谐振子坐标幂函数平均值〈nα│x^s│nα〉快捷计算方法 被引量:1
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作者 孙彦清 尹继武 龙姝明 《四川师范大学学报(自然科学版)》 CAS CSCD 北大核心 2006年第6期717-721,共5页
从同调谐振子及类氢原子坐标幂函数平均值〈nα│xs│nα〉的邻居关系出发,以极为简洁的算法展示了坐标幂函数平均值〈nα│xs│nα〉快速计算过程,给出了用计算机系统高效计算波函数和〈nα│xs│nα〉所需M athem atica源程序代码.
关键词 阶梯算符 同调谐振子 类氢原子 平均值邻居关系 Mathematica程序
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二维各向同性谐振子径向矩阵元的递推关系 被引量:4
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作者 陈昌远 《光子学报》 EI CAS CSCD 1999年第7期588-590,共3页
推导出二维各向同性谐振子径向矩阵元〈nm|ρq|n′m′〉所满足的递推关系
关键词 二维 各向同性谐振子 径向矩阵元 递推关系
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三维各向同性谐振子基态能量及波函数的两种计算方法 被引量:3
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作者 吴英 刘国跃 《绵阳师范学院学报》 2007年第8期31-33,共3页
谐振子运动的研究,无论在理论上还是应用上都具有重要意义。而三维各向同性谐振子是谐振子模型中的较具代表性的模型之一,也是量子力学中的重要模型之一,要正确深入研究此模型,必须分析其基态能量和波函数。文章从两种不同的角度对此问... 谐振子运动的研究,无论在理论上还是应用上都具有重要意义。而三维各向同性谐振子是谐振子模型中的较具代表性的模型之一,也是量子力学中的重要模型之一,要正确深入研究此模型,必须分析其基态能量和波函数。文章从两种不同的角度对此问题进行了探讨,即选用不同的坐标系(直角坐标系和球坐标系),采用两种不同的方法(分离变量法和尝试解)计算了三维各向同性谐振子的基态能量和波函数,并对结果进行了相关讨论。 展开更多
关键词 各向同性 谐振子 基态 能量 波函数
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三维各向同性谐振子的Lie对称性与守恒量 被引量:2
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作者 楼智美 《西南师范大学学报(自然科学版)》 CAS CSCD 北大核心 2004年第2期232-234,共3页
从讨论完整保守力学系统微分方程的不变性 (即Lie对称性 )出发 ,得到其确定方程、结构方程及守恒量的形式 ,从而讨论三维各向同性谐振子的Lie对称性和相应的 10个Lie对称守恒量 .
关键词 各向同性谐振子 LIE对称 守恒量 完整保守力学系统
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m维各向同性谐振子的能级简并度 被引量:1
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作者 张新明 贺劲松 《大学物理》 北大核心 1995年第10期14-15,共2页
本文给出了一种计算任意维各向同性谐振子能级简并度的简便方法。
关键词 m维 各向同性 谐振子 简并度 量子力学
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三维各向同性谐振子的超对称量子力学体系 被引量:3
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作者 黄惟承 帕热文.阿吾提 《新疆大学学报(自然科学版)》 CAS 2000年第2期34-40,共7页
利用三维各向同性谐振子的四种升、降算子 ,分别构造不同的超对称量子力学体系 ,并研究了它们的性质 .
关键词 三维 各向同性谐振子 降算子 超对称量子力学
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