Based on the modified Hertz contact theory and the simplified simulation of impact a new method is approved to calculate the impact force of outrunner blocks in debris flow on structures. Based on a limited parametric study, it is shown that the impact causes plastic deformation on concrete structures at a low velocity.
计算结果表明，泥石流大块石在很小的冲击速度（小于1m/s）下就可能导致混凝土材料冲击接触面上产生塑性变形。
In this paper, Yu Mao-hong the unified strength theory is used in the elastic-plastic analysis of structure.
本文采用俞茂宏提出的统一强度理论，将其应用于结构弹塑性分析。
The main research results are obtained as follows:(1) To understand the rheological properties of cohesive sediment, a linear gravity wave theory over Maxwell fluids of finite depth is presented, and a model to solve viscoelastic parameters by Genetic Algorithm and a pseudo-plastic model are developed; (2) A coupled numerical hydrodynamic model for wind waves and currents is developed, and a numerical model for multi-fraction fine sediment transport under combined action of wind, wave and current is developed; (3) Theoretical models for sediment suspension due to waves and combined waves and current are developed, and an analytical solution for sediment suspension due to waves and a semi-analytical solution for sediment suspension due to combined waves and current are obtained; (4) The Lattice Boltzmann Method is used to study the cohesive sediment transport due to combined waves and current, and simulation of wave boundary layer, combined wave and current boundary layer, and cohesive flocs settling in still and turbulent water are carried out.
其主要研究内容和取得的成果有：（1）为了了解粘性泥沙的流变规律，建立了有限深度Maxwell 粘弹性流体上线性重力波理论，并针对影响泥沙运动特性的流变特性进行研究，建立了利用遗传算法求解淤泥粘弹性参数的模式和泥床伪塑性体模型；（2）建立了近岸风浪与水流运动模拟的耦合水动力数值模型和风、浪、流共同作用下多组分细颗粒泥沙模拟的数学模型；（3）建立了波浪及波流共同作用下悬沙分布理论模型，得到了波浪作用下悬沙分布的解析解和波流共同作用下悬沙分布的半解析解；（4）将格子玻尔兹曼方法引入到波流共同作用下粘性泥沙运动的研究中，利用LBM对波浪边界层、波流边界层和粘性泥沙絮团的静水沉降和在水流中的沉降进行了模拟，为从微观角度研究波流边界层运动和粘性泥沙运动开辟了新的思路。
According to dynamic similarity theory an experimental model with 1:100 ratios is made out of raw material of ABS plastic in this paper For the train movable load on the surface of bridge, full load of train is considered as the only load behavior.
本文以ABS塑料为原料，按照动力相似理论，制作了一个比例为1：100的试验模型。
According to the principle of residual stress generation in grinding tooth, the mathematical models of basic parameters, force and thermal parameters of grinding tooth of spiral bevel gear were obtained by applying the thermo-elastic-plastic theory.
根据磨齿残余应力的产生机理，运用热弹塑性理论，得出了影响螺旋锥齿轮磨齿残余应力的磨齿基本参数、磨削力和磨齿热等特征参量的数学模型。
A further study of the way and theory of cutting hard brittle material in plastic state is presented.
阐述了进一步研究在塑性状态下切削硬脆材料的理论、方法，并提出了今后的设想。
Accordingly, the first invariant I〓 of the strain tensor will be zero in the infinitesimal plastic theory.
在小变形理论中表示就是其应变的第一不变量I〓=0。
Elasto-plastic theory and damage mechanics are used to obtain the stress distribution of rocks around tunnel and the relation of porous hydraulic pressure P0 and plastic radius r.
岩石是可变形的多孔介质[6]材料，在荷载和地下水压力的作用下，岩石的变形将引起其中孔隙、裂隙通道的改变，从而影响孔隙水的流动。
According to the elastic-plastic theory, the calculation method of tangential stress, radial stress of expansion casing both in elastic deformation area and in plastic deformation area is deduced and the minimum critical load between expansion core and casing was determined.
根据弹塑性的理论，推导了膨胀套管在弹性变形区和塑性变形区的周向应力和径向应力计算模型，确定了膨胀套管膨胀时在膨胀芯头与套管之间所需的最小接触载荷。
In this paper, using Finite Element numerical simulation software DYNAFQRM, according to the basic theory and method of elastic plastic Finite Element, adopting the approach of connecting numerical simulation with experience design, the forming process of the front cover is researched.
本文采用有限元数值模拟仿真软件DYNAFORM，根据弹塑性有限元的基本理论及处理方法，采用数值模拟和经验设计相结合的方法，对照相机前盖板成形工艺进行了研究。
Based on the theory of nonlinear finite element of plate and shell, a finite element method of elasto-plastic flexural-torsional buckling of steel members under cyclic loading was presented, and a nonlinear analysis program was complied.
根据板壳非线性有限元基本理论，提出了压弯钢构件在循环荷载作用下弹塑性弯扭屈曲分析的有限单元法，并编制了计算程序，通过将计算结果和其他分析比较，对本文的理论进行了验证。
Based on the theory of thermo-elastic-plastic, changes of material properties with temperature were considered, and the strain-stress-temperature coupling constitutive equations on thermo-elastic-plastic of flexural reinforced concrete members were deduced.
在热弹塑性理论的基础上，考虑了材料性能随温度的变化，导出了钢筋混凝土受弯构件热弹塑性问题的应力-应变-温度耦合本构方程。
The model of rock fragmentation is mainly based on the KUS model theory when bulk strain is possitive, but important changes have been made about both the theory and the caculating method of the stress wave, and the elastic-plastic model would be used when the bulk strain is negative.
本文基于SHALE程序原理和框架建立了模拟岩石爆破过程，固体中的应力波传播和动态过程的二维有限差分计算程序；建立了炸药爆轰传播模型；并运用损伤模型理论建立了岩石爆破破碎的损坏计算模型，在计算模型中当岩石处于体积拉伸状态时服从KUS模型理论，但修正了KUS模型中关于压力分量的计算理论和方法，从而纠正了KUS模型的计算错误；当岩石处于体积拉伸时服从弹塑性应力应变关系。
Yield function is a very important aspect of soil elasto-plastic theory. Most of yield functions used were opened or closed but not smooth.
屈服函数是土的弹塑理论中一个非常关注的重要方面，针对多数屈服面要么是开口的，要么是封闭的但不光滑的情况。
Based on the theory of multi-layer composed thick-wall cylinder, the elastic-plastic analysis of the casing-concrete sheath-rock combination was made.
基于多层组合厚壁圆筒理论，建立了套管、水泥环及井壁围岩组合体的力学模型，对均匀地应力作用下的组合体进行了弹塑性分析。
Based on the theory of multi-layer composed thick-wall cylinder, the elastic-plastic analysis of the casing-concrete sheathrock combination was made.
摘要基于多层组合厚壁圆筒理论，建立了套管、水泥环及井壁围岩组合体的力学模型，对均匀地应力作用下的组合体进行了弹塑性分析。
In the paper, the development and existing problems in the plastic forming technology of high strength aluminum alloy at home and abroad were summarized firstly. Based on the research of the precision die forging 7075 Al-alloy multi-layer cylinder parts and silumin SC100-T6 piston tails, a series of works have been done. The flow control forming process of the key parts in car airbags and hot die forging process of piston tails were successfully developed, adopting the plastic forming theory, FEM and experiment together.
本文首先综述了高强度铝合金塑性成形加工工艺的国内外发展概况以及存在的问题，围绕轿车零件7075(LC4)高强度铝合金多层杯筒形零件和中高硅铝合金SC100-T6活塞尾的精密塑性成形新工艺的研究，采用塑性成形理论、有限元模拟和工艺试验相结合的方法，做了一系列的工作，成功地开发了安全气囊关键零件的流动控制成形工艺和活塞尾精密热模锻工艺。
When a high level isotropic stress field is disturbed by a drilled hole, a relation of relieved strain vs. residual stress is derived by the basic equations of elasto-plastic theory.
本文根据弹塑性理论基本方程，导出了高水平均匀残余应力场由于钻孔引起的松弛应变与残余应力的关系公式。
Then, based on elastic theory and that lateral force coefficient is not equal to unit, formulae are constructed to determine the plastic zone. When coupled with geometric equation for plastic zone figure, solution can be attained by the digital approximation method.
在此基础上，基于弹性理论并且抛弃K=1的假设导出了求解塑性区的方程，与塑性区的几何方程一起构成可以求解的方程组。
The main research contents are as follows:1. Through massive calculation, analysis and comparison, sum up the similarities and differences between the special-shaped cross sections and rectangular cross sections in mechanical features, between reinforced concrete special-shaped columns and rectangular columns in load-bearing capacity, ductility performance and provide necessary basic concepts and data for further understanding the characteristics of the special-shaped columns; 2. Through massive elastic calculations and elasto-plastic analysis, under the preconditions of satisfying the code`s requirements for axial compression ratio, limit value of lateral displacement and load-bearing capacity of normal section, oblique section and beam-column joint, under circumstances of different intensity of earthquake, structure dead weight, sort of site and column grid bay dimension, the variation regularity of maximum suitable height of structure, and thus sum up the maximum suitable height of structure for code for the purpose of macro-control while deciding the design scheme; 3. Make a preliminary study on the stress feature of reinforced concrete special-shaped column and Z-shaped column of which the ratio of limb length to limb thickness is between 4~5, and the preliminary design method is suggested; 4. Through elato-plastic time history dynamic analysis of typical projects, check up the weak storey of the special-shaped column structure and yielding, breaking and collapse mechanism to satisfy the earthquake resistant requirement to buildings of remaining stand under strong earthquake; 5. Derive for project use simplified calculation formula of vibration period, suitable vibration period, suitable rigidity of special-shaped column structure through theoretical analysis, and provide an easy and practical method for deciding the structure scheme economically, safely and reasonably; 6. Based on the study achievements in theory and massive analysis and calculations of this paper, sum up the regularities of inner force, deformation of special-shaped column structure and seismic conceptual design, and thus the suggection of seismic design of special-shaped column structures is presented.
本文研究的主要内容如下：通过大量的计算、分析和对比，总结出异形截面与矩形截面在力学特性、钢筋混凝土异形截面柱与矩形截面柱在承载能力、延性性能等方面的异同，为深入了解异形截面柱的特点提供必要的基本概念和数据；通过大量的弹性及弹塑性计算分析，在满足规程对轴压比、侧移限值及正截面、斜截面、节点承载力抗震验算要求的前提下，在不同抗震设防烈度、结构自重、场地类别及柱网开间尺寸情况下最大适宜高度的变化规律，并在此基础上总结归纳出异形柱结构的最大适用高度规定，可用于规程，以便于在确定方案时起到宏观控制的作用；对肢长与肢厚比在4～5的钢筋混凝土异形截面柱及Z形柱的受力特点进行初步探讨，提出初步的设计方法；通过对典型工程的弹塑性动力时程分析，检验异形柱结构的薄弱层及屈服、破坏、倒塌机制，以达到建筑物大震不倒的抗震设防要求；通过理论分析，推导出异形柱结构自振周期，以及适宜自振周期、适宜刚度的工程实用简化计算公式，为经济、安全、合理地确定结构方案提供简便实用的方法；在本文理论分析、计算以及大量的研究成果基础上，总结归纳出异形柱结构内力、变形的规律及抗震概念设计内容，并在此基础上提出异形柱结构的抗震设计建议。