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In this paper,the advance of precision forging parts accuracy prediction technology is systematically illustrated in the aspects of part elastic deform ation,dies elastic deform ation,die wear,therm al expansion and shrinkage of part and die.

本文从成形件的弹性变形、模具的弹性变形、模具的磨损以及热胀冷缩几个方面综合论述了精锻产品精度预测技术的研究现状及存在的问题，并对其未来可能的发展趋势进行了分析和探讨。

Furthermore, from the theoretical analysis, we know that the anisotropic distribution of the threshold intensity results from the elastic anisotropy of the nematic liquid crystals. Hence, we analyze the issue of how the elastic anisotropy affects the optical pattern formation phenomena.

另一方面，由於系统的非线性强度会和液晶分子的分布有很大的关系，所以我们也就外加偏压对系统非线性强度的影响作了进一步的分析。

Sliding mechanic with active tieback is widely applied in preadjusted appliance in space closure. Several types of elastomers such as elastomeric ligatures, single unit elastic chain, and two units of elastic chain are used in active tieback.

随著越来越多的拔牙病例采用越来弹力橡皮圈来关闭拔牙间隙，临床上主动结扎使用的弹力橡皮圈包括结扎圈、单个的弹力链、两个单位的弹力链等。

Elastic statics mainly relates to the connection between force and transmogrification, elastic body'sinvalidation, the guide line of design in invalidation.

弹性静力学主要涉及力和变形之间的物性关系，以及弹性体的失效、与失效有关的设计准则。

The results of 3-D numerical modeling of the transversely isotropic media with horizontal symmetry axis and the orthorhombic symmetry media showed that quasi P wave,quasi-SV wave and quasi-SH wave occurred during elastic wave propagation in 3-D anisotropic media. Meanwhile, the special phenomena such as the S wave splitting, the blind zone of S wave splitting and quasi-SV wave-front triplication were clearly observed. In addition, the elastic wave-fronts are spatially changed, and the coupled relations among the quasi-P wave,quasi-SV wave and quasiSH wave in 3-D anisotropic media are very complex.

对方位各向异性介质模型和正交各向异性介质模型中弹性波的传播进行的三维数值模拟结果表明，弹性波在三维各向异性介质中传播时存在拟P波、拟SV波和拟SH波，并出现横波分裂、横波分裂盲区、波面三分叉等特殊现象，另外，性波场在空间是变化的，其拟P波、拟SV波和拟SH波的耦合关系比较复杂。

There are three types of wrinkle which frequently occur in the sheet metal forming process: flange wrinkling, wall wrinkling, and elastic buckling of the undeformed area owing to residual elastic compressive stresses.

在金属板料成型加工中通常存在三种类型的起皱现象：法兰起皱，侧壁起皱，和由于残余压应力在未变形区产生的弹性变形。

The deformation mode of pile body composite foundation is systemic studied. The solution of stress and displacement of two-layer elastic continuous body is built under vertical load of axisymmetric, elastic upper space body and circle axisymmetric. Compress deformation of underlayer of cement fcy-ash gravel pile composite foundation is analyzed.

比较系统的研究了桩体复合地基变形模式；推导建立了轴对称空间体、弹性半空间体、圆形轴对称垂直荷载下的双层弹性连续体系的应力与位移的一般解；对水泥粉煤灰碎石桩复合地基下卧层的压缩变形进行详细的分析。

For the first patern, elastic dynamics is adopted to study the steady state rolling contact, elastic dynamics incorporating with rigid dynamics is adopted to study the non-steady state. For the steady state, the analytical solution is obtained, and for the non-steady state, the variational formulation to solve the problem numerically is derived For the later patern, the function type friction coefficient is introduced. On the basis of the quasi-stastic theories of constant friction coefficients, both the exact theory and the simplified theory of the function type friction coefficient are established, the computer programms for both the theories are also made out. Using the function type friction coefficient, Shen-Hedrick-Elkins theory's application range is extended to large creepage .

对于速度对接触体力学特性的影响，本文采用弹性动力学方法和弹性动力学与刚体动力学相结合的方法分别对稳态和非稳态两种情况进行了研究，得到了稳态情况的解析解，给出了对非稳态情况进行数值求解的变分公式；对于速度对相关物理量的影响，本文主要讨论了速度对摩擦系数的影响，在滚动接触准静态理论的基础上引进了函数型摩擦系数，建立了函数型摩擦系数的滚动接触准静态精确理论和简化理论，并分别编制了相关的计算程序，还用函数型摩擦系数将简便的Shen-Hedrick-Elkins理论的适用范围扩展到大蠕滑区。

In order to analyze the stiffness of 3D 4 directional braided composites, the homogenization theory based on the multi-scale perturbation theory was used as the basic theory. The virtual displacement principle was used to educe the homogenization formulation of effective elastic modulus and the schemes to solve the problem using finite element method. The effective elastic modulus of 3D braided composites were predicted by this method and the calculation results agree quite well with experiment results.

在对三维编织复合材料刚度性能的分析过程中，以基于小参数渐近展开和多尺度摄动方法的均匀化理论为理论基础，用虚位移原理导出了等效弹性模量的均匀化列式及其有限元求解方程，从而通过细观和宏观有限元的数值分析方法预测了三维四向编织复合材料的等效弹性模量，预测结果与实验结果较为吻合。

The thesis discusses three eigenvalues individually and explains the pressure wave propagation of three modes, includes wave speed, wave decay and energy distribution. Since the elastic potential energy occupies more than 98% of mechanical energy in the arteries, which is larger than 2% of kinetic energy of flowing blood. Else join elastic wall and wall of managing having a viscid condition to analysis .

本文将个别讨论此三组特徵值，来说明三组压力波的传递模态，其中包括波速，以及波的衰减；由於在动脉的能量分布中，由管壁振动的弹性位能占了98%，远超过血液本身流动的2%，再加上管的弹性模数和管壁的黏滞性再来讨论此三组模态，个别在弹性管的能量分布。

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。