The validity of the local approach for aluminum alloy welded joint is investigated by using the results of fatigue tests of 3A21 gusset-welded joints. Based on the three-dimensional finite element analysis of welded joints, the 1st principal stress and residual stress are calculated and the influence of the element size on local approach is discussed.
文中采用铝合金3A21角接焊缝的拉伸疲劳试验结果就Dang Van准测的局部法对铝合金焊接接头疲劳评定的有效性进行研究，用三维有限元方法计算角焊缝的最大主应力和铝合金焊接接头的残余应力，并分析有限元单元尺寸对局部法评定的影响。
According to the application method of KF in the design, some modules are programmed. According to the KF application ways for component analysis, it completes the principal shaft critical speed calculation tools, which directly fuse the finite element analysis technology into the rotor system design.
针对KF在零部件设计中的应用建立了部分零件的设计模块，针对KF在零件分析中的应用建立了主轴一阶临界转速快速计算工具，将有限元分析技术直接融合在转子系统设计当中。
A three-dimensional finite element model for precision cutting 3J33 maraging steel using the commercial software Marc is presented to study the effect of tool nose radius on chip formation, the principal cutting forces and the temperature fields.
在商业化软件Marc的基础上建立了圆弧刃精密切削三维有限元模型，研究不同半径的圆弧刃精密切削条件下主切削力、切屑形状和切削温度场分布。
The new method of the static elasto-plastic analysis is reviewed for structures with shear wall, in which the shearwall is replaced by equivalent column based on the equivalent principal of the inelastic response and internal forces between the shearwall and equivalent column. The inelastic response of shear wall is modeled by plastic hinge of column element.
0前言近年来要求采用静力弹塑性分析方法进行大震分析的工程逐渐增多，原因有以下两方面：一是超限高层建筑的不断增加，根据超限高层抗震审查报告要求，需要进行大震下的计算；其次，由于结构软件的不断发展，有些程序增加了这部分功能，具有代表性的程序有ETABS和SAP2000等。
First, this article introduced 2 grade of rotary kiln principle of work and the equipment, to rolled the circle mechanics behavior to carry on the analysis, proposed - rolled the circle - under roller's rotary kiln overall modelling based on the tube body - kiln liner - big tooth ring, to rolled the circle - under roller's contact stress to carry on the finite element analysis the method, and obtained rolled the circle contact stress the size and the distribution rule, finally indicated that rolled the circle contact stress mainly to have two main peak values and the sudden change in one week, appeared is rolling the circle and the under roller contact area; Then, rolls the circle the stress to regard as is the principal stress unknown plane stress test, the use quite mature modern test technology, proposed rolls the circle stress test the principle and the plan, and to rolled the circle the stress to carry on the scene test, the stress which the scene test analysis result and the finite element analysis calculated has compared, had proven the whole method modelling's finite element analysis method's rationality and rolled the circle - under roller contact stress the result accuracy; Finally, uses ANSYS APDL the re-development technology, in view of 2 grades of rotary kilns, rolled the circle - under roller contact stress the overall finite element analytic method to carry on the re-development.
首先，本文介绍了2档回转窑工作原理和装置，对滚圈的力学行为进行了分析，提出了基于筒体-窑衬-大齿圈-滚圈-托轮的回转窑整体建模，对滚圈-托轮的接触应力进行有限元分析的方法，并得到了滚圈接触应力的大小和分布规律，结果表明滚圈接触应力在一周内主要存在两个主要的峰值和突变，都出现在滚圈与托轮接触区域；然后，把滚圈的受力看成是主应力未知的平面应力的测试，利用比较成熟的现代测试技术，提出了滚圈应力测试的原理和方案，并对滚圈的应力进行了现场测试，现场测试分析结果与有限元分析计算出的应力相比较，证明了整体法建模的有限元分析方法的合理性和滚圈-托轮接触应力的结果的正确性；最后，利用ANSYS的APDL的二次开发技术，针对2档回转窑，就滚圈-托轮接触应力的整体有限元分析法进行了二次开发。
Pressure vessel; tooth-locked; plastic load; finite element analysis; the 5% maximum principal strain rule
压力容器；齿啮式；塑性载荷；有限元分析； 5%最大主应变准则
Aimed at the minimum maximum principal stress, based on three dimensional finite element analysis, with the help of FEM software, an optimization method is used to design the main parameters of the joint cross of universal coupling.
利用ANSYS软件对轧机主传动系统的万向联轴器十字轴进行三维有限元分析，在此基础上，以十字轴所承受的最大主应力最小作为追求目标，在ANSYS软件中对其主要参数进行了优化，得出了较为理想的结果。
This article that focuses on the systematic and in-depth research in the current primal problem about abnormal burst pressure reservoir depress burst pressure has procured following main fruits:1 It forms the method which could obtain massive vertical static state mechanics parameters.2 In a foundation of acquisition of rock mechanics parameters, apply bent lamella that as mechanical model along with characteristic of actual geologic characteristics to analysis curvature for anticlinal strcture, get homologous tectonic stress value throug relation between the curvature and stress and different principal curvature in anticlinal structure, consequently set up laminational stress model for anticline reservoir. The block lamination for existed fracturing date has formed method of setting up mechanical model of lamination terrestrial stress by abtaining the block tectonic stress coefficients which are got by complex utilization test, laboratory test and fracturing date playback.3 Analysesing the main reason which lead to high burst pressure by considering the characteristic of reservoir geology, reservoir, and rock mechanics and reservoir damage, etc. Establishing burst pressure quantitative prediction model which provide gist for depressing construction risk and optimizing construction craft under the condition of open hole completion, gun-perforated completion and damaged reservoir.4 Provding theoretical basis for interpreting acidification pretreatment which could depress busrt pressure by finding the relation between the influencing factors and rock machanics parameters and analysing the factors that have effect on rock mechanics parameters. Expounding the mechanism of reaction of mixed monomineral and acid from the angle of microcosmic element, evaluating quantitatively acid sensilility of different kinds of mineral effectively, and determing the first-order reaction dynamical equation of each mineral.5 Revealing rock mechanics property chage as a result of acid flooding in different condition by sandstone traumata experiment in different temperatures which combined with rock mechanics triaxial stress experiment.6 Associating damage mechanics with sandstone acidizing, established sandstone damage mechanics model in the foundation of the recognition on the rock mechanics parametric variation which is caused by acid-rock reaction in both macroscopic view and microscopic view, also demonstrated those processes and quantitative estimated the acid busrt pressure to direct the site operation.
本文针对目前异常破裂压力储层降低破裂压力的主要问题展开较为系统和深入的研究，取得了以下主要成果：1形成了利用测井资料，结合室内岩芯测试结果，获取静动岩石力学参数的相关性特征，从而获得纵向上大量静态力学参数的方法。2在获取了岩石力学参数的此基础上，利用弯曲薄板作为力学模型，结合区块实际地质特征对背斜构造进行曲率分析，通过曲率与应力的关系，利用背斜构造不同部位的主曲率求得相应的构造应力值，从而建立起背斜储层的分层应力模型；对已有压裂资料的区块分层，形成了综合利用测试、室内实验、压裂资料反演获得该区块构造应力系数，建立起分层地应力的力学模型的方法。3综合考虑储层地质、油藏、岩石力学特性和储层伤害等因素，分析造成高破裂压力的主要原因，综合利用岩石力学、弹性力学等知识，建立了裸眼完井、射孔完井条件下以及储层受到伤害后的储层破裂压力定量预测模型，为降低施工风险和优化施工工艺提供了依据。4完成了物性、岩性影响岩石力学参数的因素分析，找出了各影响因素和岩石力学参数之间的关系，为从机理上解释酸化预处理降低破裂压力提供了理论基础；从微观元素的角度阐述了单矿物与酸反应的机理；并在此基础上，有效评价了各种矿物的酸敏感性，定量确定了岩石中各矿物的一级反应动力学方程。5完成了不同温度下的酸液类型、酸液浓度、注酸量等一系列砂岩损伤实验，结合岩石力学三轴应力实验，系统揭示了在不同条件下注酸而引起的岩石力学性质变化。6将损伤力学与砂岩酸化相结合，在宏观、微观两个方面认识酸岩反应引起岩石力学参数变化基础上，建立了砂岩损伤力学模型，并对其进行验证，在此基础上定量计算酸化后的破裂压力，有效指导现场施工
The distribution of the principal stress fields in the rock beneth the circle cutter、wedge cuter and worn wedge cutter were calculated using the finite element methods.
论文在后半部分采用有限元方法计算了圆齿、尖顶楔形齿、圆弧冠顶楔形齿压入平井底面和齿槽井底面的应力场分布。
In this article author measured the principal element and trace element of Maifanshi with X-ray fluorescence spectrometric method of analysis.
本文用X-射线荧光光谱分析法对麦饭石中的主元素和微量元素进行了测定，测定结果达到检出线的有24种，其中有些是人体所必需的元素。
Principal Element; Trace Element; X-ray Fluoressence SpectroMetric Analysis; Absorption Reinforced Effect
主元素；微量元素； x-射线荧光光谱分析；吸收—增强效应
At the top of the storage hierarchy pyramid are the primary storage component found in the computer. The principal element is the primary storage section along with other specialized processing and control storage elements that may be found in the CPU.
在存储器层次结构金字塔的顶部是CPU中的主存储器，起主要部件是主存储器区以及CPU中的其他专门处理和控制存储器的部件。
The industry magnesia mainly uses in making the ceramics, the enamel, the fire-proof material and so on; In the polishing compound, the adhesive, in the paint manufacture takes the stopping; In the artificial fiber, the rubber (chloroprene rubber, fluorine rubber) make the promoter and the catalyst; Makes the antacid on the medicine in the laxative, uses in treating the hyperacidity, the stomach and duodenum ulcer; May take the hard sugar purification is the decolorant in the food processing, the ice cream pH value conditioner and so on; In the construction profession, the magnesia may the manufacturing contain the magnesium special cement and the heat preservation board and so on; The biggest use is serves as the fertilizer and domestic animal's feed in the agriculture, causes the plant and in the animal metabolism process principal element, when serves as cow's feed, may prevent because to lack nervous system function being out of balance which the magnesium causes, namely the so-called forage grass convulsion gets sick; Uses in the chemical industry making the metal magnesium and the magnesium chemical, like magnesium sulfate, magnesium chloride as well as other chemicals; Moreover also uses in the water treatment, the detergent which the flue was mad uses in the glass, the dye, the electric cable, the silcon steel industry, the uranium processing, the electronics industry, the insulation material industry, as well as uses in professions and so on petroleum chemical additive, casting, phenolic plastic.
工业氧化镁主要用于制造陶瓷、搪瓷、耐火材料等；在抛光剂、黏合剂、油漆的制造中作为填充料；在人造纤维、橡胶中作促进剂和催化剂；在医药上作抗酸剂于轻泻剂，用于治疗胃酸过多、胃和十二指肠溃疡病；在食品加工上可作为砂糖精制是的脱色剂，冰淇淋的pH值调节剂等；在建筑行业中，氧化镁可生产制造含镁特种水泥和保温板等；在农业上最大用途是用作肥料和牲畜的饲料，使植物和动物代谢过程中的主要元素，用作奶牛的饲料时，可防止因缺镁而引起的神经系统机能失调，即所谓牧草性痉挛病；在化学工业中用于制造金属镁和镁化学品，如硫酸镁、氯化镁以及其他化学品；另外也用于水处理，烟道气的洗涤剂用于玻璃、染料、电缆、硅钢工业、铀加工、电子工业、绝缘材料工业，以及用于石油添加剂、铸造、酚醛塑料等行业。
Here, the dual nonlinear tangental stiffness matrixes of binodal spatial beam element and triangular plate/shell element of 6 nodal DOF to Update|Lagrange coordinate systems are derived, the incremental equation of virtual work is linearized to simplified calculation, beam|plate coupling, deviation of principal nodes and subordinated no...
推导了三维桁元、梁元和三角形板壳元在UL描述下的双重非线性切线刚度矩阵，通过对增量形式虚功方程作线性化处理来减少计算量，考虑了梁／杆与板对应节点定位偏差和节点焊接安装误差，进而编制计算程序。
The structures of the principal allotropic forms of all the elements will be discussed in detail as the chemistry of each element is treated.
各种元素的主要的同素异性体的结构，在研究各种元素的化学时再详细地讨论。
Then, introduce model of commonly used gauss, combine weather condition of change and environmental element, diffuse to aeriform leak undertake forecasting an analysis, will diffuse distributinging circumstance of area and chroma is shown intuitionisticly on the map come, automatic inquiry suffers the unit of the influence, population and principal facilities, amend in time deal with plan.
接着，采用常用高斯模型，结合变化的气象条件和环境因素，对气体泄漏扩散进行猜测分析，将扩散区域和浓度分布情况在地图上直观地显示出来，并自动查询受影响的单位、人口和重要设施，及时修正处置方案。
The fund is the enterprise survival principal element, the fundflows affects enterprise's whole operation, the enterprise staff'swages is an enterprise fund management important constituent.
资金是企业生存的主要元素，资金的流动影响到企业的整体运作，企业员工的工资是企业资金管理的一个重要的组成部分。
In this paper, the principal theory on sheet forming and elastic-plastic finite deformation is studied firstly, and then some key techniques of static-implicit elastic-plastic FEM in sheet forming process, such as the selection of element model, the treatment of dynamic boundary conditions and oblique constraint are also discussed. On the basis above, a set of static-implicit elastic-plastic FEM system SHEET3D is developed.
本文深入研究了板料成形理论及弹塑性有限变形理论，并针对板料成形静力隐式弹塑性有限元分析中的一些关键技术，如单元模型的选取，动态边界条件的处理，斜约束条件的处理等进行了探讨，在此基础上开发了一套针对三维板料成形的弹塑性静力隐式有限元模拟软件SHEET3D。
Then based on effective stress principal and horizontal different element method, the formulation of the earth and water active pressure acting on rigid retaining wall is performed considering soil arching and seepage flow effect.
在土拱和渗流作用分析基础上，考虑有效应力原理，结合水平微分单元方法，推导了土拱和渗流同时作用下水土压力计算公式。
The portico is a principal feature of Greek temple architecture and thus a prominent element in Roman and all subsequent Classically inspired structures.
是古希腊庙宇建筑的主要特征之一，因此也是罗马及以后所有受古典主义启示的建筑的一个重要组成部分。