A COMPARATIVE STUDY OF THE OPENING AND CLOSING PROCESS OF TWO TYPES OF MECHANICAL HEART VALVES USING ALE FINITE ELEMENT METHOD

ＡＣＯＭＰＡＲＡＴＩＶＥＳＴＵＤＹＯＦＴＨＥＯＰＥＮＩＮＧＡＮＤＣＬＯＳＩＮＧＰＲＯＣＥＳＳＯＦＴＷＯＴＹＰＥＳＯＦＭＥＣＨＡＮＩＣＡＬＨＥＡＲＴＶＡＬＶＥＳＵＳＩＮＧＡＬＥＦＩＮＩＴＥＥＬＥＭＥＮＴＭＥＴＨＯＤＡＣＯＭＰＡＲＡＴＩＶＥＳＴＵＤＹＯＦ...     

INCREASING PROPERTY OF SPECTRUM IN THE VIBRATIONS OF A CYCLIC CHAIN OF MASSES DISTRIBUTED ACCORDING TO THE GTM SEQUENCE

ＩＮＣＲＥＡＳＩＮＧＰＲＯＰＥＲＴＹＯＦＳＰＥＣＴＲＵＭＩＮＴＨＥＶＩＢＲＡＴＩＯＮＳＯＦＡＣＹＣＬＩＣＣＨＡＩＮＯＦＭＡＳＳＥＳＤＩＳＴＲＩＢＵＴＥＤＡＣＣＯＲＤＩＮＧＴＯＴＨＥＧＴＭＳＥＱＵＥＮＣＥＳｈａｎｇＰｅｎｇｊｉａｎ（商朋见）（Ｄｅｐａｒ...     

CONSTRUCTION OF MODIFIED TAYLOR－GALERKIN FINITE ELEMENTS AND ITS APPLICATION IN COMPRESSIBLE FLOW COMPUTATION

ＣＯＮＳＴＲＵＣＴＩＯＮＯＦＭＯＤＩＦＩＥＤＴＡＹＬＯＲ－ＧＡＬＥＲＫＩＮＦＩＮＩＴＥＥＬＥＭＥＮＴＳＡＮＤＩＴＳＡＰＰＬＩＣＡＴＩＯＮＩＮＣＯＭＰＲＥＳＳＩＢＬＥＦＬＯＷＣＯＭＰＵＴＡＴＩＯＮＣＯＮＳＴＲＵＣＴＩＯＮＯＦＭＯＤＩＦＩＥＤＴＡＹＬＯＲ...     

Effect of magnetic fields on viscous liquid column with finite length in a vertical straight tube

ＥＦＦＥＣＴＯＦＭＡＧＮＥＴＩＣＦＩＥＬＤＳＯＮＶＩＳＣＯＵＳＬＩＱＵＩＤＣＯＬＵＭＮＷＩＴＨＦＩＮＩＴＥＬＥＮＧＴＨＩＮＡＶＥＲＴＩＣＡＬＳＴＲＡＩＧＨＴＴＵＢＥＷｅｎＧｏｎｇ－ｂｉ（温功碧）;ＳｕｎＫｅ－ｌｉ（孙克利）（ＤｅｐａｒｔｍｅｎｔｏｆＭ...     

Numerical modeling of the initial stage of the generation of unsteady vortices from sharp corner in plane compressible flow

ＮＵＭＥＲＩＣＡＬＭＯＤＥＬＩＮＧＯＦＴＨＥＩＮＩＴＩＡＬＳＴＡＧＥＯＦＴＨＥＧＥＮＥＲＡＴＩＯＮＯＦＵＮＳＴＥＡＤＹＶＯＲＴＩＣＥＳＦＲＯＭＳＨＡＲＰＣＯＲＮＥＲＩＮＰＬＡＮＥＣＯＭＰＲＥＳＳＩＢＬＥＦＬＯＷＨｕａｎｇＤｕｎ（黄敦）（Ｄｅｐａｒｔ．...     

ANALYTICAL SOLUTION OF RADIATED SOUND PRESSURE OF RING－STIFFENED CYLINDRICAL SHELLS IN FLUID MEDIUM

ＡＮＡＬＹＴＩＣＡＬＳＯＬＵＴＩＯＮＯＦＲＡＤＩＡＴＥＤＳＯＵＮＤＰＲＥＳＳＵＲＥＯＦＲＩＮＧ－ＳＴＩＦＦＥＮＥＤＣＹＬＩＮＤＲＩＣＡＬＳＨＥＬＬＳＩＮＦＬＵＩＤＭＥＤＩＵＭＸｉｅＧｕａｎｍｏ（谢官员模）ＬｕｏＤｏｎｇｐｉｎｇ（骆东平）（Ｒｅｃｅｉｖ...     

A NON－INCREMENTAL TIME－SPACE ALGORITHM FOR NUMERICAL SIMULATION OF FORMING PROCESS

ＡＮＯＮ－ＩＮＣＲＥＭＥＮＴＡＬＴＩＭＥ－ＳＰＡＣＥＡＬＧＯＲＩＴＨＭＦＯＲＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＯＦＦＯＲＭＩＮＧＰＲＯＣＥＳＳＬｉｕＢａｏｓｈｅｎｇ（柳葆生）ＣｈｅｎＤａｐｅｎｇ（陈大鹏）ＬｉｕＹｕ（刘渝）（ＲｅｃｅｉｖｅｄＡｐｒ...     

THE ANALYTICAL STUDY ON THE LASER INDUCED REVERSE－PLUGGING EFFECT BY USING THE CLASSICAL ELASTIC PLATE THEORY（II）──REVERSE－BULGE MOTION

ＴＨＥＡＮＡＬＹＴＩＣＡＬＳＴＵＤＹＯＮＴＨＥＬＡＳＥＲＩＮＤＵＣＥＤＲＥＶＥＲＳＥ－ＰＬＵＧＧＩＮＧＥＦＦＥＣＴＢＹＵＳＩＮＧＴＨＥＣＬＡＳＳＩＣＡＬＥＬＡＳＴＩＣＰＬＡＴＥＴＨＥＯＲＹ（ＩＩ）──ＲＥＶＥＲＳＥ－ＢＵＬＧＥＭＯＴＩＯＮ￥(周益春，...     

INITIAL BOUNDARY VALUE PROBLEMS FOR A CLASS OF NONLINEAR INTEGRO－PARTIAL DIFFERENTIAL EQUATIONS

ＩＮＩＴＩＡＬＢＯＵＮＤＡＲＹＶＡＬＵＥＰＲＯＢＬＥＭＳＦＯＲＡＣＬＡＳＳＯＦＮＯＮＬＩＮＥＡＲＩＮＴＥＧＲＯ－ＰＡＲＴＩＡＬＤＩＦＦＥＲＥＮＴＩＡＬＥＱＵＡＴＩＯＮＳＣｕｉＳｈａｎｇ－ｂｉｎ（崔尚斌）（Ｄｅｐｔ．ｏｆＭａｔｈ．,ＬａｎｚｈｏｕＵｎｉ...     

SOLVING THE FREE BOUNDARY PROBLEM IN CONTINUOUS CASTING BY USING BOUNDARY ELEMENT METHOD

ＳＯＬＶＩＮＧＴＨＥＦＲＥＥＢＯＵＮＤＡＲＹＰＲＯＢＬＥＭＩＮＣＯＮＴＩＮＵＯＵＳＣＡＳＴＩＮＧＢＹＵＳＩＮＧＢＯＵＮＤＡＲＹＥＬＥＭＥＮＴＭＥＴＨＯＤＬｉＹａｏｙｏｎｇ（李耀勇）；ＺｈａｎｇＺｈｉｌｉ（张自立）（ＲｅｃｅｉｖｅｄＪｕｎｅ，１８，１９...     

各向异性材料界面共线刚性线夹杂的反平面问题

研究两种各向异性材料焊接界面含共线刚性线夹杂的反平面问题,导出了一般问题的公式和几个典型问题的封闭形式解,求出了刚性线尖端的应力分布,从文中解答的特殊情况,直接导出各向性材料界面与均匀各向异性介质中相应问题的公式与结果,并与有关文献相一致。     

Antiplane Problems of Periodical Rigid Line Inclusions between Dissimilar Anisotropic Materials

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｓｏｌｉｄｍａｔｅｒｉａｌｓ,ａｒｉｇｉｄｌｉｎｅｉｎｃｌｕｓｉｏｎａｎｄａｓｌｉｔｃｒａｃｋａｒｅｔｈｅｔｗｏｅｘｔｒｅｍｅｃａｓｅｓｏｆａｆｌａｔｉｎｈｏｍｏｇｅｎｅｉｔｙ,ｗｈｉｃｈｌｅａｄｔｏｓｔｒｅｓｓｃｏｎｃｅｎｔｒａｔｉｏｎｓ.Ｔｈｅｐｒｏｂｌｅｍｓｏｆｃｒａｃｋｓａｎｄｒｉｇｉｄｌｉｎｅｉｎｃｌｕｓｉｏｎｓｆｏｒａｎｉｓｏｔｒｏｐｉｃｍａｔｅｒｉａｌｓｒｅｃｅｉｖｅｍｏｒｅａｎｄｍｏｒｅａｔｔｅｎｔｉｏｎｗｉｔｈｄｅｖｅｌｏｐｍｅｎｔｏｆｃｏｍｐｏｓｉｔ…     

Antiplane problem of circular ARC interfacial rigid line inclusions

The antiplane problem of circular arc rigid line inclusions under antiplane concentrated force and longitudinal shear loading was dealt with. By using RiemannSchwaz‘s symmetry principle integrated with the singularity analysis of complex functions, the general solution of the problem and the closed form solutions for some important practical problems were presented. The stress distribution in the immediate vicinity of circular arc rigid line end was examined in detail. The results show that the singular stress fields near the rigid inclusion tip possess a square-root singularity similar to that for the corresponding crack problem under antiplane shear loading, but no oscillatory character. Furthermore, the stresses are found to depend on geometrical dimension, loading conditions and materials parameters. Some practical results concluded are in agreement with the previous solutions.     

两种各向异性材料界面共线裂纹的反平面问题

本文研究两种各向异性材料界面共线裂纹的反平面剪切问题。利用复变函数方法，提出了一般问题公式和某些实际重要问题的封闭形式解。考察了裂纹尖端附近的应力分布并给出了应力强度因子公式。从本文解签的特殊情形，可以直接导出两种各向同性材料界面裂纹，均匀各向异性材料共线裂纹以及均匀各向同性材料共线裂纹的相应问题公式，其中包括已有的经典结果。     

General forms of elastic-plastic matching equations for mode-Ⅲ cracks near crack line

Crack line analysis is an effective way to solve elastic-plastic crack problems.Application of the method does not need the traditional small-scale yielding conditions and can obtain sufficiently accurate solutions near the crack line. To address mode-Ⅲ crack problems under the perfect elastic-plastic condition,matching procedures of the crack line analysis method are summarized and refined to give general forms and formulation steps of plastic field,elastic-plastic boundary,and elastic-plastic matching equations near the crack line. The research unifies mode-Ⅲ crack problems under different conditions into a problem of determining four integral constants with four matching equations.An example is given to verify correctness,conciseness,and generality of the procedure.     

General forms of elastic-plastic matching equations for mode-Ⅲ cracks near crack line

Crack line analysis is an effective way to solve elastic-plastic crack problems. Application of the method does not need the traditional small-scale yielding conditions and can obtain sufficiently accurate solutions near the crack line. To address mode- Ⅲ crack problems under the perfect elastic-plastic condition, matching procedures of the crack line analysis method axe summarized and refined to give general forms and formulation steps of plastic field, elastic-plastic boundary, and elastic-plastic matching equations near the crack line. The research unifies mode-III crack problems under different conditions into a problem of determining four integral constants with four matching equations. An example is given to verify correctness, conciseness, and generality of the procedure.     

Analysis of the Singularity for the Vertical Contact Problem of Line Crack-Inclusion

ＩｎｔｒｏｄｕｃｔｉｏｎＵｐｔｏｎｏｗ ,ｔｈｅｔｅｃｈｎｉｃａｌｌｉｔｅｒａｔｕｒｅｏｎｓｅｐａｒａｔｅｃｒａｃｋｓ,ｖｏｉｄｓ,ｉｎｃｌｕｓｉｏｎｓａｎｄｔｈｅｉｎｔｅｒａｃｔｉｏｎｓｂｅｔｗｅｅｎｃｒａｃｋｓａｎｄｉｎｃｌｕｓｉｏｎｓｈａｖｅｂｅｅｎｑｕｉｔｅｅｘｔｅｎｓｉｖｅ.Ｈｏｗｅｖｅｒ,ｔｈｅｃｏｎｔａｃｔｐｒｏｂｌｅｍｓｏｆｃｒａｃｋ＿ｉｎｃｌｕｓｉｏｎｄｏｎｏｔｓｅｅｍｔｏｂｅａｓｗｉｄｅｌｙｓｔｕｄｉｅｄ .Ｔｈｉｓｐａｐｅｒｃａｎｂｅｒｅｇａｒｄｅｄａｓｔｈｅｆｕｒｔｈｅｒｒｅｓｅ…     

轴对称环形片状界面裂纹问题分析

讨论受拉伸载荷作用的轴对称环形片状界而裂纹问题．该问题归结为求解一组超奇异积分-微分方程．方程中的未知位移间断近似表示为基本密度函数与多项式之积,其中基本密度函数考虑到问题的对称性用二维界面裂纹精确解表示．在圆形片状裂纹的情况下,数值结果与现有理论解作比较的结果表明,数值结果与相应界面圆形片状裂纹和均质体圆形片状裂纹的精确解均吻合得很好．文中以图表形式给出应力强度因子与材料组合和几何条件之间的关系．     

2维各向异性弹性力学中的Stroh公式和某些不变量

本文简要综述了各向异性弹性体2维变形的Stroh公式。该公式数学上优美而应用上有力。它的最近进展使我们将已有的复数形式的解转变成实数形式,进而可去解决一些迄今尚未解出的问题。结果,发现了许多有趣的而在物理上难以预料的现象。例如,对于界面包含x_3轴的各向异性双介质体,如果线力和线位错都沿x_3轴,那末包含x_3轴的任意径向平面上的面拉力将不随径向平面的选择而变化。而且,在任何固定点上的应力与界面的方位无关。要揭示的其他一些不变性质是:双介质材料中的虚拟力,界面裂纹上的应力奇异,界面裂纹表面上的振荡,等等;另外,在具有一个有限裂纹,或一个椭圆孔,或一个刚性椭圆核的无穷大均匀介质中的某些应力和位移也是不变量。这些不变量的大部分尚未有它们的物理解释。在实数形式的解中,Barnett-Lothe张量常常出现。在绕x_3轴转动时,这些张量的分量的某些组合是不变的。这些组合将在本文中推导并列出。最后我们给出了某些各向异性弹性材料,它们的Barnett-Lothe张量是不变量,即这些张量的所有分量在绕x_3轴转动时是不变的。     

A moving screw dislocation near interfacial rigid lines in two dissimilar anisotropic media

This paper attempts to investigate the problem for the interaction between a uniformly moving screw dislocation and interface rigid lines in two dissimilar.anisotropic. materials. Integrating Riemann-Schwarz＇s symmetry principle with the analysis singularity of complex functions, we present the general elastic solutions of this problem and the closed form solutions for interfaces containing one and two rigid lines. The expressions of stress intensity factors, at the rigid line tips and image force acting on moving dislocation are derived explicitly. The results show that dislocation velocity has an antishielding effect on the rigid line tip and a larger dislocation velocity leads to the equilibrium position of dislocation closing with the rigid line. The presented solutions contain previously known results as the special cases.