Three-Dimensional Stress State of an Orthotropic Rectangular Prism under a Transverse Force Applied at its End

The exact three-dimensional elastic solution is found for an orthotropic composite rectangular prism (plate) bent by a transverse force applied to its end. The three-dimensional distribution of stresses and displacements is obtained. The distribution of tangential stresses in the prism and plate is analyzed numerically. New qualitative features of the distribution are established. The strength of the plate is estimated, and the transverse force and torque are determined. The Kirchhoff-Love relations of plate bending are partially justified__________Translated from Prikladnaya Mekhanika, Vol. 41, No. 4, pp. 30–37, April 2005.     

On the Strong Ellipticity of the Anisotropic Linearly Elastic Materials

In this paper we derive necessary and sufficient conditions for strong ellipticity in several classes of anisotropic linearly elastic materials. Our results cover all classes in the rhombic system (nine elasticities), four classes of the tetragonal system (six elasticities) and all classes in the cubic system (three elasticities). As a special case we recover necessary and sufficient conditions for strong ellipticity in transversely isotropic materials. The central result shows that for the rhombic system strong ellipticity restricts some appropriate combinations of elasticities to take values inside a domain whose boundary is the third order algebraic surface defined by x ²+y ²+z ²−2xyz−1=0 situated in the cube , , . For more symmetric situations, the general analysis restricts combinations of elasticities to range inside either a plane domain (for four classes in the tetragonal system) or in an one-dimensional interval (for the hexagonal systems, transverse isotropy and cubic system). The proof involves only the basic statement of the strong ellipticity condition.      

Universal scaling of kinetic freeze-out parameters across different collision systems at LHC energies

In this study, we perform Tsallis Blast-Wave analysis on the transverse momentum spectra of identified hadrons produced in a wide range of collision systems at the Large Hadron Collider (LHC) including pp, pPb, XeXe, and PbPb collisions. The kinetic freeze-out properties varying with event multiplicity are investigated across these systems. We find that the extracted kinetic freeze-out temperature, radial flow velocity, and non-extensive parameter exhibit a universal scaling behavior for these systems with very different geometric sizes, especially when the independent baryon Tsallis non-extensive parameter is considered. This universality may indicate the existence of a unified partonic evolution stage in different collision systems at the LHC energies.     

TOPOLOGY AND VORTEX STRUCTURES OF A CURVING TURBINE CASCADE WITH TIP CLEARANCE (Ⅱ)- TOPOLOGICAL FLOW PATTERN AND VORTEX STRUCTURE IN THE TRANSVERSE SECTION OF A BLADE CASCADE

By means of ink trace visualization of the flows in conventional straight, positively curved and negatively curved cascades with tip clearance, and measurement of the aerodynamic parameters in transverse section, and by appling topology theory, the topological structures and vortex structure in the transverse section of a blade cascade were analyzed. Compared with conventional straight cascade, blade positive curving eliminates the separation line of the upper passage vortex, and leads the secondary vortex to change from close separation to open separation, while blade negative curving effects merely the positions of singular points and the intensities and scales of vortex. Foundation items: 973 Project of China; the Doctoral Foundation of Education Ministry of China (EDAF24403003) Biography: YANG Qing-hai (1969−)     

复合载荷作用下具有光滑中心波纹膜片的非线性分析

采用轴对称旋转壳体的简化Reissner方程，研究了在复合载荷作用下具有光滑中心波纹膜片的非线性弯曲问题。应用积分方程方法，可以获得膜片的特征关系（载荷－中心挠度关系）。文末给出了实例计算的数值结果。     

DAP增强梁结构形状控制的机理研究

对称粘贴在梁结构上下表面上的压电元件在外部电场的作用下能使梁结构发生弯曲变形，通过分析驱动构件与结构中的应变分布，采用定向固定的压电元件(DAP，即directional attached piezoelectric)来代替传统的压电元件(CAP，即conventional attached piezoelectric)，减小了驱动构件的横向效应，提高了压电驱动的效率，并进行了实验对比验证。     

墙—桩—土共同作用的位移影响系数的计算

本文根据Ｍｉｎｄｌｉｎ方程积分，推导出地下连续墙作为承重结构的墙－桩－土共同作用位移影响系数为计算公式，得到了共同作用柔度矩阵用于地下连续墙作承重结构与桩，筏（箱）基础和地基及上部结构共同作用分析中，可以得出比较满意的结果。     

压剪炮的激光测速系统的研究

压剪炮试验是获取材料超高应变率下本构关系的最常用手段,其中普遍采用的测试方法是利用激光干涉技术同时测量靶板背面一点的纵向和横向速度。但传统的横向位移干涉仪抵抗靶板撞击过程中的运动而引起的光路偏移能力很有限,因而压剪试验成功率很低。本文讨论了撞击过程中靶板运动对横向位移干涉仪试验信号的影响,为提高横向位移干涉仪特别是非理想撞靶情况下的测量能力,对几种不同干涉光路进行详细分析。通过改进传统横向位移干涉光路,研制了一种新干涉光路,并通过试验证明:相对于传统光路,新光路更简单并更可靠。     

Magnetic properties in a transverse Ising nanowire with an antiferromagnetic spin configuration at the surface

The phase diagrams and temperature dependences of magnetizations in a transverse Ising nanowire with an antiferromagnetic spin configuration at the surface are studied by the use of the effective-field theory with correlations. A number of characteristic features, such as the possibility of reentrant phenomena being free from disorder-induced frustration, are obtained for the magnetic properties in the system.