Forming limit during superplastic deformation of sheet metals

ＦＯＲＭＩＮＧＬＩＭＩＴＤＵＲＩＮＧＳＵＰＥＲＰＬＡＳＴＩＣＤＥＦＯＲＭＡＴＩＯＮＯＦＳＨＥＥＴＭＥＴＡＬＳＤｕＺｈｉｘｉａｏ（杜志孝）;ＬｉＭｉａｏｑｕａｎ（李淼泉）;ＬｉｕＭａｂａｏ（刘马宝）;ＷｕＳｈｉｃｈｕｎ（吴诗惇）（Ｆａｃｕｌｔｙ４０２ｏ...     

Effects of AMB parameters on the dynamic stability of the rotor

ＥＦＦＥＣＴＳＯＦＡＭＢＰＡＲＡＭＥＴＥＲＳＯＮＴＨＥＤＹＮＡＭＩＣＳＴＡＢＩＬＩＴＹＯＦＴＨＥＲＯＴＯＲＷａｎｇＨｏｎｇ－ｌｉ（王洪礼）ＷｕＺｈｉ－ｑｉａｎｇ（吴志强）（Ｄｅｐｔ,ｏｆＭｅｃｈａｎｉｃｓ,ＴｉａｎｊｉｎＵｎｉｖｅｒｓｉｔｙ）Ｔｉａｎ...     

SPATIAL－TEMPORAL DISCRETE COORDINATION OF FEM AND DIRECT INTEGRAL METHOD FOR TRANSIENT DYNAMIC PROBLEMS

ＳＰＡＴＩＡＬ－ＴＥＭＰＯＲＡＬＤＩＳＣＲＥＴＥＣＯＯＲＤＩＮＡＴＩＯＮＯＦＦＥＭＡＮＤＤＩＲＥＣＴＩＮＴＥＧＲＡＬＭＥＴＨＯＤＦＯＲＴＲＡＮＳＩＥＮＴＤＹＮＡＭＩＣＰＲＯＢＬＥＭＳＷａｎｇＨｕａｉ－ｚｈｏｎｇ（王怀忠）（ＳｈａｎｇｈａｉＵｎｉｖｅｒ...     

结构几何非线性分析的一种修正的有限元迁移矩阵法

本文提出一种修正的有限元法与迁移矩阵法相结合的方法用于结构几何非线性劳力分析。该法可克服一般的ＦＥ－ＴＭ法只适用于规则边界结构的缺点，同时可避免由于传递矩阵连续相乘而产生的误差传递。采用修正的步长增量法与修正的牛顿。拉斐逊方法相结合的算法于非线性问题的求解，编制了在ＩＢＭ－ＰＣ／ＡＴ上实现该方法的计算机程序ＴＮＯＮＤＬＷ１，数值计算结果表明了本文方法及所编制程序的有效性。     

The compression LS estimate of regression coefficient in multivariate linear model

ＴＨＥＣＯＭＰＲＥＳＳＩＯＮＬＳＥＳＴＩＭＡＴＥＯＦＲＥＧＲＥＳＳＩＯＮＣＯＥＦＦＩＣＩＥＮＴＩＮＭＵＬＴＩＶＡＲＩＡＴＥＬＩＮＥＡＲＭＯＤＥＬＣｈｅｎＳｈｉ－ｊｉ（陈世基）（Ｄｅｐｔ．ｏｆＭａｔｈｅｍａｔｉｃｓ,ＦＵｊｉａｎＮｏｒｍａｌＵｎｉｖｅｒ...     

DYNAMIC RESPONSE OF LAMINATED ORTHOTROPIC SPHERICAL SHELLSINCLUDING TRANSVERSE SHEAR DEFORMATION AND ROTATORY INERTIA

（杨宜谦）（马和中）（王俊奎）ＤＹＮＡＭＩＣＲＥＳＰＯＮＳＥＯＦＬＡＭＩＮＡＴＥＤＯＲＴＨＯＴＲＯＰＩＣＳＰＨＥＲＩＣＡＬＳＨＥＬＬＳＩＮＣＬＵＤＩＮＧＴＲＡＮＳＶＥＲＳＥＳＨＥＡＲＤＥＦＯＲＭＡＴＩＯＮＡＮＤＲＯＴＡＴＯＲＹＩＮＥＲＴＩＡ￥Ｙａｎｇ...     

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

ＩＮＣＲＥＡＳＩＮＧＰＲＯＰＥＲＴＹＯＦＳＰＥＣＴＲＵＭＩＮＴＨＥＶＩＢＲＡＴＩＯＮＳＯＦＡＣＹＣＬＩＣＣＨＡＩＮＯＦＭＡＳＳＥＳＤＩＳＴＲＩＢＵＴＥＤＡＣＣＯＲＤＩＮＧＴＯＴＨＥＧＴＭＳＥＱＵＥＮＣＥＳｈａｎｇＰｅｎｇｊｉａｎ（商朋见）（Ｄｅｐａｒ...     

结构几何非线性分析的一种修正的有限元迁移矩阵法

本文提出一种修正的有限元法与迁移矩阵法相结合的方法用于结构几何非线性静力分析。该法可克服一般的ＦＥ－ＴＭ法只适用于规则边界结构的缺点，同时可避免由于传递矩阵连续相乘而产生的误差传递。采用修正的步长增量法与修正的牛顿－拉斐逊方法相结合的算法于非线性问题的求解，编制了在ＩＢＭ－ＰＣ／ＡＴ上实现该方法的计算程序ＴＮＯＮＤＬＷ１，数值计算结果表明了本文方法及所制程序的有效性。     

Iterative construction of fixed points for multivalued operators of the monotone type in uniformly smooth Banach spaces

ＩＴＥＲＡＴＩＶＥＣＯＮＳＴＲＵＣＴＩＯＮＯＦＦＩＸＥＤＰＯＩＮＴＳＦＯＲＭＵＬＴＩＶＡＬＵＥＤＯＰＥＲＡＴＯＲＳＯＦＴＨＥＭＯＮＯＴＯＮＥＴＹＰＥＩＮＵＮＩＦＯＲＭＬＹＳＭＯＯＴＨＢＡＮＡＣＨＳＰＡＣＥＳＤｅｎｇＬｅｉ（邓磊）（ＣｈｏｎｇｑｉｎｇＴ...     

THE BOUNDED EXTERMINATION AND STABILITY OF MUTUAL INTERFERENCE SYSTEM OF FOUR－DIMENSIONAL SPECIES

ＴＨＥＢＯＵＮＤＥＤＥＸＴＥＲＭＩＮＡＴＩＯＮＡＮＤＳＴＡＢＩＬＩＴＹＯＦＭＵＴＵＡＬＩＮＴＥＲＦＥＲＥＮＣＥＳＹＳＴＥＭＯＦＦＯＵＲ－ＤＩＭＥＮＳＩＯＮＡＬＳＰＥＣＩＥＳＨｏｕＧａｎ－ｓｈｅｎｇ（侯赣生）（Ｄｅｐｌ．ｏｆＰｈｙｓｉｃｓ,Ｊｉａｎｇｘ...     

隔水管弯曲对钻柱振动影响的计算与分析

海洋油气资源钻探中隔水管的弯曲对钻柱振动以及钻进特性有特别的影响。为得到隔水管弯曲对钻柱振动的影响规律,对南海已钻深水井使用非线性有限元软件建立全井钻井数值计算模型,研究获得了不同垂深时隔水管弯曲对钻柱振动特性的影响规律。研究表明:隔水管弯曲会加剧钻柱的振动,钻柱振动加剧会导致钻井能耗上升、钻头切削能力下降并且会加快钻柱疲劳;当隔水管的弯曲达到某临界值,钻柱与隔水管间的接触力会陡增;井口的钩载越大,隔水管弯曲带来的井口钩载波动量越大;井越深,隔水管弯曲对全井钻柱最大弯矩和钻头切削能力的影响越小。     

On the existence of the derivative of the volume average

A general theorem on the derivative of the volume average is formulated and proved. Conditions for the existence of the derivative are presented and discussed. This is done in order to give a better base to the theory of spatial averaging.Latin Letters E ₃ three-dimensional vector space over the field of real numbers - K, K(x) averaging domain - G, G _w, G_s open sets in E ₃; components of the two-phase system - C ¹(G) the set of functions 1-times continuously differentiable in G - W1/2(G) Sobolev space - V volume of the domain K - f function defined in G, G _w - K _infi ^sup* (x), K _infi ^sup– (x) special parts of K(x) Greek Letters boundary of G, G _w, G_s; w-s interface - _ij Kronecker delta - v unit outward normal of G, G _w - _j j-dimensional Lebesgue measure Other M closure of a set M in the metric space E ₃ - f phase average of f for the w-phase - (u, v) scalar product of u, v in E ₃ - one-sided derivatives     

On the study of the initiation of the micro crack on the smooth surface of polycrystalline

Crystallographic plasticity was applied to study the initiation of micro cracks on the smooth surface of polycrystalline under uniform applied stress. Even under the uniform external stress, due to the different crystallographic orientations of the grains in the polycrystalline, there is un-uniform stress distribution and the deformation is also not uniform. Under the fatigue loading, the roughness increases with the number of fatigue, and deformation will localize in some places, where micro cracks form.     

进气道入口形状对冲压发动机性能影响数值研究

进气道是冲压发动机设计中非常重要的环节,其入口设计会直接影响冲压发动机的总压恢复系数σ和流量系数φ等重要性能。本文采用二阶迎风隐式TVD格式,内外流分区耦合求解可压缩N-S方程,数值模拟了掺混段出口压力与来流压力比为P/P∞=4.2超临界状态下,二元方形截面“X”型布局进气道、弹体和掺混段一体化通气模型复杂流场。计算比较了两种不同二元进气道入口形状流场和冲压发动机总压恢复系数σ、流量系数φ的结果,对其产生的原因进行了分析。