验证理论

The time-temperature equivalence principle verified on rock creep is imported to search theoretic gist for the relation between the mechanical performance of concrete material after fire and the temperature and the undergoing time.

4引入在高温下岩石性能分析中得到了验证的时温等效原理，为火灾高温后混凝土力学性能与温度、时间的耦合关系寻找理论依据。

Through the example of Yingnahe bridge finite element analysis, the theory is examined and the difference is acceptable.

通过对英那河实桥的有限元分析，验证了理论结果，完成了整桥的稳定性分析。

As for the problems in the experimentation, such as the slow response speed of axes torque control, the disturbance of torque control to position control of throttle lever and the torque fluctuation of axis, solutions had been put forward and proved theoretically.

对于试验过程中出现的以下问题，油门杆高速运动中输入轴力矩控制的响应速度较慢，输入轴力矩控制对油门杆位置控制的扰动，以及输入轴力矩脉动现象，提出了解决方法，并且从理论上加以验证。

The objective of this study was to analyze the square cup stretching process by using the dynamic explicit finite element analytical program, which was based on the Updated Lagrangian Formulation and elasto-plastic theory. Simulation results included the deformation and crack propagation history, the variation of the work piece thickness, the Forming Limit Diagram, and the relationship between punch load and punch stroke. A set of tools was designed for the square-cup stretching experiment to verify the reliability of the program.

中文摘要本文采用显性动态有限元素法，结合材料弹塑性理论，发展出一套三维增量型之有限元素分析程式，进行金属板材方杯拉伸成形制程及破裂之分析，并探讨方杯拉伸成形历程及裂纹成长历程、工件厚度变化、成形极限图(Forming Limit Diagram， FLD)，及冲头负荷与冲程关系，并设计一组方形冲模来进行方杯拉伸成形实验，以验证程式的可信度。

The indoor model test using organic glass is carried out and the displacement, stress, earth pressure as well as its distribution type are measured to verify the theoretical values.

使用有机玻璃进行室内模型试验，实测了端墙的位移、路面板应力、端墙应力及土压力，验证了理论分析结果，获得了端墙背后土压力的分布形式。

The main research tasks and results are as follows:(1) Through comparing the stress intensity factor of compact tension specimen calculated by finite element software with the theoretical value, the feasibility of calculating fracture parameters of crack tip in ABAQUS software was verified.(2) The relationship between the elastic modulus of the material and research scale was studied based on deriving the cohesive stress theory and other relevant theories. And the elastic modulus of the material on meso-scale was determined.(3) Global model and sub-model of the finite element were built in th...e macro-scale, and stress-strain field nearby the crack tip was analyzed, and the results show that the detailed stress-strain in the crack tip could be obtained by using the sub-model technique.(4) In meso-scale, the crack growth model was also established by assuming the crack propagating along the grain boundary, and the detailed stress-strain field in the crack tip was obtained.(5) The effect of crack length on Von Mises stress, and maximum principal stress and strain was analyzed in meso-scale when equivalent KI equals 30MPa.m1/2. And the results show that except for crack tip area, the stress-strain distribution in whole specimen is not affected.

主要完成研究内容和取得成果如下：(1)利用有限元软件计算出紧凑拉伸试样的裂纹尖端应力强度因子KI值，其结果与理论值一致，从而验证了利用ABAQUS计算裂纹尖端相关断裂参量的可行性；(2)在研究内聚应力等相关理论的基础上，推导出了研究尺度与材料弹性模量的近似关系，并确定了介观尺度上的弹性模量；(3)在宏观尺度上建立了全局有限元计算模型和子模型，得到了裂纹尖端应力应变场分布，结果表明利用子模型技术获得比较准确的裂纹尖端应力应变场分布是可行的；(4)在介观尺度上利用平均晶粒尺度的方式建立了裂纹沿晶扩展模型，得到了裂纹尖端断裂过程区的微观应力应变场；(5)当应力强度因子为30MPa.m1/2时，分析了介观尺度上在裂纹沿晶扩展过程中裂纹长度对Mises应力、最大主应力和应变的影响，结果表明，裂纹扩展长度对试样整体应力应变分布影响不大，而对裂纹尖端区域有较大影响；(6)介。。。

The correctness of the obtained method was validated by means of simulative calculation and analysis on the following-up steering of certain car rear axle, thus a theoretical basis was provided for improving the manipulation stability of the vehicle.

通过对某轿车后桥随动转向的仿真计算与分析，验证了所得方法的正确性，为改善车辆的操纵稳定性提供了理论依据。

The largest rangeof stable oscillation is obtained from a symmetric plane-plane resonation, in which thedistance between two rods is twice as the mirror-rod distance.

通过二棒串接和三棒串接的实验验证了理论分析的结果，激光器在较宽的范围内稳定工作，双棒串接的激光器最大输出功率为 840W，三棒串接的激光器最大输出功率为 970W。

Based on the theoretically calculated structural parameters and processing ones, an involute external spline shaft with class-4 precision was rolled.

对所得结论进行实验验证，按照理论计算的结构参数及工艺参数，可以滚压出4级精度的渐开线外花键轴。

For example, in the research of the space distributing structure of a certain pollutant in the atmosphere, space variation of the pollutant in the soil, design of pollution monitoring net of groundwater, and the v...

首先概述了研究的目的及意义，阐述了克里格方法在水环境系统中的应用情况，然后介绍了克里格方法的基本理论和方法，进而重点讨论了纯时间域和时空域克里格的性质和建模方法，最后将纯时间域克里格方法应用到地表水评价中，预测了某湿地未来几年的水质变化趋势，验证了该模型方法在地表水评价的水质预测方面是可行的。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。