主应力

Based on the elastic-plastic plane strain theory, we set up FEM model including the influence of the constitution stress to simulate the mining process, and use the results of simulat.

在考虑水平最大构造主应力作用的基础上，建立了平面应变弹塑性有限元模型，用于模拟研究金川二矿区一号矿体在采矿过程中地表附近岩体应力状态的变化过程。

Under the mantlerock, the Tangential stress increases gradually and the Vertical stress goes slightly down.

最大主应力约等于竖向应力，与井筒轴向夹角为11.9°～14.25°。

The minimum principal stress criteria adopted in the new model ,compared with the minimum tangential stress criteria of traditional method ,illustrates the mechanism during hydraulic fracturing procedure more objectively.

新的理论模型采用了最小主应力破坏准则，与现有方法采用的最小切向应力破坏准则相比，更客观的表述了水压致裂过程中的力学机制。

Based on true triaxial tests, this paper proposes an angle of equivalent internal friction a.

结合以往的真三轴试验结果，建议了一个复杂应力状态下的等效内摩擦角，在此基础上提出了一个考虑中主应力影响的无粘性土(c=0)的破坏准则。

In near-neutral pH solution, the cracking mode is transgranular with the feature of quasicleavage.The function of SCC factors are as follows:(1)The additional potential takes an important role in the SCC behavior of X70 pipeline steel: the susceptibility to SCC increased with decreasing cathodal potential,HIC is the dominant reason,the crackles on the surface are almost vertical to stress;On the country, at anodic potential,there is a critical potential,below which the dominant reason is anode-dissolving supported by hydrogen,and the crackles on the surface are not vertical to stress.

电位因素和环境因素的影响作用为：(1)在阴极极化电位区，SCC敏感性随电位的负移而增加，氢致开裂作用占主导，表面裂纹多与拉应力垂直；在阳极极化区间，存在阈值电位，低于阈值电位时，SCC为氢促进阳极溶解所致，表面裂纹多与主应力方向成一定角度。

Frictionally slipping contact ; equivalent stress ; principal stress ; contact pressure ; shear traction

摩擦滑动接触；等效应力；主应力；接触压力；剪切牵引力

Methods A wet hip joint's sample from corpse was scaned by CT and all images of every cross-section hip joint's layer was obtained, and an hip joint's model was contructed with Unigraphics NX 2.0 and Solid Works 2006 SP 0.0 software. The models were assembled when simulated total hip arthroplasty after total hip joint prosthetic and ischiofemoral ligament model had been constructured. Analysis was done on von Mises stress distribution and amount of total hip component when simulated seated leg-crossing manuver. The bone and metal components were meshed as rigid bodies, composed of three-dimensional, all-quadrilateral rigid body elements, and hip joint capsule ligament was fully three-dimensional, hexahedral continuum elements representations. Results The current form of this ischiofemoral ligament's reconstruction finite element model provided for multi-body contact, large displacement interfacial sliding, large deformation capsule ligament representation, and clearly reflected the real ischiofemoral ligansent's anatomy and biomechanical behavior. The maximum on Mises stresses at the joint interface was more than that fur an otherwise identical hardware-only construct.

选择成人尸体髋关节行CT成像得到髋关节每层横截面图像，提取边界坐标，利用有限元分析软件Unigraphics NX 2.0和Solid-Works 2006 SP0.0构建出髋关节三维有限元模型及人工髋关节假体，并模拟全髋置换术进行装配，将坐股韧带按其术中重建位置进行构建骨骼与金属模型采用三维十节点四面体实体单元进行网格划分，关节囊六面体连接单元划分，模拟坐位腿交叉动作载荷获取假体撞击过程的角活动度和相应的von Mises应力分布情况结果所构建的多体连接、大界面划移、大变形的坐股韧带重建有限元模型，客观反映坐股韧带真实解剖形态及生物力学行为，增加坐股韧带重建的模型其关节面的最大主应力值大于仅有金属的模型。

By adopting strain intenerated model and using numerical calculation of FLAC(Fast Lagrangian Analysis of Continue), deformation and destruction course under pick cutting is researched, different parameters' great influence on plasticity district, max displacement, max main stress and max shearing stress under the various kinds of operating modes is analyzed.

采用应变软化的模型，使用连续介质快速拉格朗日分析法(FLAC，FastLagrangianAnaly-sisofContinue)进行数值模拟计算；研究截齿截割作用下煤体变形破坏过程；分析各种工况下不同参数对煤体塑性区、最大位移、最大主应力、最大剪应力的影响。

The stress analysis and the fatigue life loss calculation of steam drum are carried out in this article. A simplification formula is proponed to calculate the main stress and is used in configuration of DCS. The rain-flow method is used to count the fatigue cycle, which can satisfy the need of on-line monitoring.

本文对其进行了应力分析和疲劳寿命损耗的计算，并提出主应力计算的简化公式用于DCS组态，采用雨流法作为在线计算的疲劳计数方法，满足了寿命损耗在线监测的要求。

The foundation soil is divided for finding the ultimate bearing capacity of a foundation with given buried depth and size. Supposing a uniform load acts on the foundation, Mindlin's integral formula and comer points method are used to get extra stress of every mesh knot by MATLAB program, then the principal stress is found. Combining with failure criterion, MATLAB program is used to find coordinates of points which are destroyed. Using graphic processing function of MATLAB, the failure points are showed in the coordinate.

为确定作用在已知埋深、给定基础形状地基土上的极限承载力，对基底下的土体进行网格划分，先假定一均布荷载作用在此地基土上，运用明德林解的积分公式，结合角点法，编制MATLAB语言程序，求出每个网格节点上附加应力，进而求得每个网格节点上主应力，根据破坏准则，结合程序找出破坏点的坐标，利用MATLAB的图形处理功能，把破坏点的坐标在坐标图中显示出来。

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。