应力

With the large-scale finite element software ANSYS,we can achieve single-well and double-wells mechanical model, do a lot of simulations with different interwell space and get the stress value and stress image, and then use EXCEL to generate the correlation curve ,at the same time compare the stress image with different interwell space .

本文主要采用大型有限元软件ANSYS实现单口井和双口井力学模型的建立，进行大量的模拟计算得到不同井间距下的应力值和应力云图，然后借助EXCEL生成对比曲线，同时比较不同井间距时的应力云图。

The conventional X ray diffraction method is improved in combination with glance incidence, side inclination, internal standard and cross correlation function.

结合掠射、侧倾、内标及交相关函数定峰等技术，改进了常规X射线应力测量方法，测量了上述薄膜中的内应力，表明可显著提高内应力测量精度。

The mathematical model of brace stress-strain in the vacuum glazing was established based upon the crunode method of elastic mechanics.

用弹性力学的结点法建立真空玻璃支撑应力-应变数学模型，求出真空玻璃的支撑应力-应变场，分析了其应力-应变分布规律，同时用电测方法进行试验验证。

First, For the coronary artery stent, two kinds of loads, including the pressure named 〓 derivatively from the balloon and the counterforce named 〓 on the wall edge of the stent, have been taken into account in the analysis of the stent.〓 and 〓 were changing as the stent expanding. So, the expansion process of the stent could be considered as the process composing of many extremely short equilibrium processes, where 〓 and 〓 could be regarded as constants and the stresses, the strains and the displacements were obtained using NFEA in every processes. Then, the stresses, the strains and the displacements obtained in every processes or steps were added up to get the final structure of the coronary stent.

首先，解决了支架有限元分析的载荷非线性问题，认为医用心血管支架受到两种载荷的作用：球囊直接传递的压力〓和球囊对不锈钢支架丝壁边缘的反作用力〓，这两种载荷在支架分析中必须都考虑进去；〓为非线性载荷，随着支架扩张不断变化，处理时将支架扩张的整个过程看成由37个很短的平衡过程组成，在每个过程中取〓为常量，采用有限元法获得应力、应变、位移，最后将各过程的应力、应变、位移迭加起来就获得了不锈钢支架总的应力、应变和位移；本研究用变分法和有限元法模拟杆件拉伸证明了上述方法是合理的。

The results show that, the dynamic strength of sand is strongly depended on initial orientation of the major principal stress and consolidated deviator stress ratio, but less associated with initial coefficient of intermediate principal stress.

研究表明：初始主应力方向角与固结偏应力比对饱和砂土的动强度影响显著，而初始中主应力系数的影响不大。

As application examples, mode-I stress intensity factors of cracked beams are obtained with present approach, the results are shown to agree well with those of Tada's handbook. The physical illustration of deviator strain energy release rate aboutintegral is given in this paper.

最后建立了利用有限元分析结果来计算积分值的基本公式，改进了当积分路径沿外边界积分时，应力张量难以在边界上分解成应力偏张量和应力球张量的这一缺陷。

The analysis of the results show as follow:(1)The consolidated-undrained creep, which doesn't include the volume strain, can be expressed by logarithmic functions as a type of under a different deviator stress.(2)The shear creep behaves in a linear elastic character in a lower stress level, and it is a nonlinear behavior in a higher stress level.

分析表明：(1)固结不排水蠕变中没有体积变化，不同偏应力下剪切蠕变可用对数形式表达；(2)固结不排水剪切蠕变在低应力水平下表现为线性粘弹性，而高应力水平时则具非线性的特性。

Under the information theory, more applications are provided to those back analysis methods. Based on the Duncan-Chang E-B model, which can simulate earth-rock dam's non-linear mechanics behavior well, the paper introduced the nature coordinate system to the stress space. In this way, hydrostatic stress and stress deviator were decomposed each other.

论文以能较好模拟土石坝非线性力学行为的Duncan-Chang E-B模型为基础，通过引入应力空间下的自然坐标系，分解应力球量与应力偏量，从而导出一个在有限元计算中，位移对参数偏导数的闭合形式公式。

Based on the characteristics of stress distribution in high-pressure cylinder ,the formula of calculating the maximal equivalent stress is educed according to the fourth strength theory and the quantitative relationship between cylinder's inside pressure and diametrical ratio and the fatigue limit were founded.

基于高压缸的应力分布特点，由第四强度理论推导出了高压缸最大应力的当量应力的计算公式，建立了缸筒内压与缸筒径比及持久极限的量化关系。

In this paper, residual stress was measured with different diffraction angle, then the errors and caused reasons were analyzed by contrasting the resting results.

采用不同的衍射角对微晶玻璃的应力进行测试，对应力结果进行了比较，分析了应力产生误差的原因。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。