In this paper , a three dimensional finite element analysis has been used to analyse the loading stress of utw pavement . the critical loading position of utw plate and the rules of the effect of the joint spacing of plate , the thickness of overlay , ec / es and the interface conditions between concrete overlay and existing ac on the stress are provided 本文采用三维有限元法分析了utw路面荷载应力，确定了路面板的临界荷位，得出了板接缝间距、厚度、板与地基模量比( ec es )和层间接触状况对应力的影响规律。
Abstract : the saturation behavior of stress current is studied . the three types of precursor sites for trap generation are also introduced by fitting method based on first order rate equation . a further investigation by statistics experiments shows that there are definite relationships among time constant of trap generation , the time - to - breakdown , and stress voltage . it also means that the time constant of trap generation can be used to predict oxide lifetime . this method is faster for tddb study compared with usual breakdown experiments 文摘:基于一阶速率方程,讨论了恒定电压应力下应力电流的饱和行为.通过对应力电流的拟合,发现存在三类缺陷产生的前身.更进一步的统计实验显示,在缺陷产生时间常数、击穿时间以及应力电压之间存在着明确的关系.这意味着缺陷产生时间常数能够被用于有效预测氧化层的寿命.与常规的氧化层击穿实验相比,基于缺陷产生时间常数的预测更快、更有效
The results show that the influences of duration and amplitude of stress wave on spallation process of rock under stress wave loading are important ; and stress wave with different waveforms is characteristic of different stress values and different stress loading ratios during the same period of time , which brings about the comprehensive effect when difform stress wave is loaded to medium 通过对不同应力波延续时间、不同应力波峰值和不同应力波波形下应力波诱发层裂过程的数值分析，对应力波反射诱发层裂的规律和机制进行探讨。
The important meaning of controlling incident wave form for the experiment is take into account , eigen - line method was used to calculate the transmit of the stress wave among the variable cross - section bar . using the elastic wave inversion deductive method the mathematical model was founded , which can be used to calculate the shape of the dam from the incident wave form 考虑控制入射波形对动态试验的重要意义，本文利用特征线法对应力波在变截面杆中的传播进行了数值求解；在此基础上应用弹性波反演的思想建立了根据入射波形求解弹丸形状的数学模型，并用试验对求解结果进行了验证。
The significant properties of this article are : the parameters which involved the design and the field test were used to analyze the stress and deformation of the med ; the stress and deformation analysis was conducted to the med under constructing ; the statistics model is used to deal with these data collected through the field monitoring ; several different methods were employed to predict the stress and deformation of the md ( 4 )压力和变形的预测：对坝体完建时及蓄水后的应力和变形作出预测。本文的主要特色有：使用设计修改后及具体施工中的参数对坝体应力和变形进行分析计算；对施工期的坝体应力和变形进行分析计算；使用统计模型进行安全监测的数据处理；使用不同方法对应力和变形作出预测。
( 3 ) the statistics model is employed to press and analyze the date , which were collected through the security field monitoring , to the stress and deformation of the med , and then these results were compared with fem results , of the med before it was banked to 140m . ( 4 ) the stress and deformation prediction the med has been made both while the dam has been built height of 185m and after the reservoir is full of water ( 3 )茅坪溪防护大坝填筑至140米高程时应力和变形安全监测资料分析：使用统计模型对应力和变形安全监测获取的应力和变形资料进行数据处理和分析，并与茅坪溪防护大坝140米高程以下施工情况下的应力和变形的分析计算结果作出比较。
By using the arrived fundamental solution , combined with the " pseudo - traction " method and the boundary collocation , the stress intensity factor for crack in a finite plate under compressive loading are solved , the effects of crack direction and boundary condition on the stress intensity factor are analyzed , and the varying curves of the sif along with the width are given 将所得的基本解与“伪力法” 、边界配置法相结合，得到了有限板在压缩荷载作用下应力强度因子的解法，分析了裂纹方向和边界条件对应力强度因子的影响，给出了应力强度因子随板宽的变化曲线。
Generally , structure ' s stresses , not internal force , can be obtained by analyzing discrete structures with routine solid elements , but internal forces of structure such as moment , axial force and shear force are required in the design criterions which are working in the design of hydraulic structures and industrial and civil structures . a convenient method based on the equilibrium condition of internal force and element ' s stresses is presented in this paper . this method can directly solve constraining internal forces on the designated sections , and then solve the moment , axial force and shear force on the corresponding sections 一般情况下用常规的实体单元对结构进行离散后求解得到的是结构的应力而非内力，而现行水工结构及工业与民用建筑结构设计规范的设计准则主要是建立在结构内力（如弯矩、轴力、剪力等）基础上的，本文采用了一种根据单元应力及内力平衡条件直接求解指定截面上的约束内力，并进而求解相应截面上的弯矩、轴力、剪力等的方法，该方法不需要对应力进行拟合。
The study indicate that the surface form has no effect on kl , but has obvious effect on kll , and will affect the breaking angle and mode ; in finite plate , the boundary condition has effect on the sif and the k is bigger than in infinite plate ; the effect of the distance and the angle between cracks are all have obvious effects on the multiple crack interaction , and the interactions between cracks also have obvious effects on the sif , which can be neglect only when the distance is bigger enough 研究表明：裂面状态对k _的大小没有影响，而对k _的影响却很大，相同应力条件下，裂面状态会影响裂纹的开裂角和开裂方式；有限板的边界对应力强度因子有一定的影响，其k比无限板中的k略大；裂纹间的距离、夹角等因素对裂纹间的干涉效应均有较大影响，裂纹间的干涉效应对应力强度因子的影响非常显著，只有当裂纹间的距离充分大时，干涉效应才可忽略。
